Lock and Key mechanism of enzyme action? -Biology

Lock and Key mechanism of enzyme action? -Biology
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Key and lock hypothesis of enzyme action was given by (A) Fischer (B) Koshland (C) Buchner (D) Kuhne

Description : Key and lock hypothesis of enzyme action was given by (A) Fischer (B) Koshland (C) Buchner (D) Kuhne

Last Answer : Answer : A

Template/lock and key theory of enzyme action is supported by (A) Enzymes speed up reaction (B) Enzymes occur in living beings and speed up certain reactions (C) Enzymes determine the direction of reaction (D) Compounds similar to substrate inhibit enzyme activity

Description : Template/lock and key theory of enzyme action is supported by (A) Enzymes speed up reaction (B) Enzymes occur in living beings and speed up certain reactions (C) Enzymes determine the direction of reaction (D) Compounds similar to substrate inhibit enzyme activity

Last Answer : Answer : D

‘Lock’ and ‘Key’ model of enzyme action proposed by Fisher implies that (A) The active site is flexible and adjusts to substrate (B) The active site requires removal of PO4 group (C) The active site is complementary in shape to that of the substrate (D) Substrates change conformation prior to active site interaction

Description : Lock' and Key' model of enzyme action proposed by Fisher implies that (A) The active site is flexible and adjusts to substrate (B) The active site requires removal of PO4 group ( ... complementary in shape to that of the substrate (D) Substrates change conformation prior to active site interaction

Last Answer : Answer : C

Fischer’s ‘lock and key’ model of the enzyme action implies that (A) The active site is complementary in shape to that of substance only after interaction. (B) The active site is complementary in shape to that of substance (C) Substrates change conformation prior to active site interaction (D) The active site is flexible and adjusts to substrate

Description : Fischer's lock and key' model of the enzyme action implies that (A) The active site is complementary in shape to that of substance only after interaction. (B) The active site is ... change conformation prior to active site interaction (D) The active site is flexible and adjusts to substrate

Last Answer : Answer : B

How an enzyme attaches to a substrate using the lock and key hypothesis?

Description : How an enzyme attaches to a substrate using the lock and key hypothesis?

Last Answer : What is the answer ?

The hypothesis to explain enzyme– substrate complex formation: (A) Lock and key model (B) Induced fit theory (C) Proenzyme theory (D) Both (A) and (B)

Description : The hypothesis to explain enzyme– substrate complex formation: (A) Lock and key model (B) Induced fit theory (C) Proenzyme theory (D) Both (A) and (B)

Last Answer : Answer : C

Induced fit mechanism of enzyme action -Biology

Description : Induced fit mechanism of enzyme action -Biology

Last Answer : answer:

Study of drug-receptor interaction has now shown that: A. Maximal response occurs only when all receptors are occupied by the drug B. Drugs exert an ‘all or none’ action on a receptor C. Receptor and drugs acting on it have rigid complementary ‘lock and key’ structural features D. Properties of ‘affinity’ and ‘intrinsic activity’ are independently variable

Description : Study of drug-receptor interaction has now shown that: A. Maximal response occurs only when all receptors are occupied by the drug B. Drugs exert an all or none' action on a ... lock and key' structural features D. Properties of affinity' and intrinsic activity' are independently variable

Last Answer : D. Properties of ‘affinity’ and ‘intrinsic activity’ are independently variable

Study of drug-receptor interaction has now shown that: A. Maximal response occurs only when all receptors are occupied by the drug B. Drugs exert an ‘all or none’ action on a receptor C. Receptor and drugs acting on it have rigid complementary ‘lock and key’ structural features D. Properties of ‘affinity’ and ‘intrinsic activity’ are independently variable

Description : Study of drug-receptor interaction has now shown that: A. Maximal response occurs only when all receptors are occupied by the drug B. Drugs exert an all or none' action on a ... lock and key' structural features D. Properties of affinity' and intrinsic activity' are independently variable

Last Answer : D. Properties of ‘affinity’ and ‘intrinsic activity’ are independently variable

Telescopicing pole stop and lock mechanism?

Description : Telescopicing pole stop and lock mechanism?

Last Answer : Is this supposed to be repeatable or a one-time event where the poles extend and then lock permanently in that state? If repeatable, will it only deal with lateral forces or will there be force directly against the direction of the telescoping?

What was the first automobile to have a key lock?

Description : What was the first automobile to have a key lock?

Last Answer : I just gave you a “Great Question” upvote. I love your question, have no idea about the answer, and look forward to learning.

At my shared apt. the landlady comes in the house when she wants and enters anybody's room with her key. I want to double-lock my door. How?

Description : At my shared apt. the landlady comes in the house when she wants and enters anybody's room with her key. I want to double-lock my door. How?

Last Answer : It depends on your rental agreement really. Some landlords put in their agreements that they can enter their property at any time, others say they will give notice unless it's an emergency. First thing to ... locks to the property, so check for that too. It could be against your agreement to do so.

Why do some computer keyboards have a "NUM LOCK" Key?

Description : Why do some computer keyboards have a "NUM LOCK" Key?

Last Answer : You can download macros which let you reassign keys. Numlock was for incomplete keyboards without a number pad.

Inspired by another question: what would you put in place of the CAPS LOCK key?

Description : Inspired by another question: what would you put in place of the CAPS LOCK key?

Last Answer : Uncaps lock. For those times when you use Caps and forget to switch it off.

Ignition key lock?

Description : Ignition key lock?

Last Answer : I don’t know, uber! My friend has an ‘89 corolla that has the opposite ‘feature’. well, we haven’t decided if it’s a feature or a defect, but you can pull the key straight out of the ignition without turning, and the car will stay on. it comes in pretty handy. good question!

I have a key but no lock and a space but no door. What am I? -Riddles

Description : I have a key but no lock and a space but no door. What am I? -Riddles

Last Answer : Keyboard.

Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. You cannot send the key in an unlocked box since it may be stolen or copied. How do you send the valuable object, locked, to your friend - so it may be opened by your friend? -Riddles

Description : Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached ... you send the valuable object, locked, to your friend - so it may be opened by your friend? -Riddles

Last Answer : Send the box with a lock attached and locked. Your friend attaches his or her own lock and sends the box back to you. You remove your lock and send it back to your friend. Your friend may then remove the lock she or he put on and open the box.

You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have. How do you do it? Note that you cannot send a key in an unlocked box, since it might be copied. -Riddles

Description : You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than ... do it? Note that you cannot send a key in an unlocked box, since it might be copied. -Riddles

Last Answer : Attach a lock to the ring. Send it to her. She attaches her own lock and sends it back. You remove your lock and send it back to her. She removes her lock.

Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. You cannot send the key in an unlocked box since it may be stolen or copied. How do you send the valuable object, locked, to your friend - so it may be opened by your friend? -Riddles

Description : Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached ... you send the valuable object, locked, to your friend - so it may be opened by your friend? -Riddles

Last Answer : Send the box with a lock attached and locked. Your friend attaches his or her own lock and sends the box back to you. You remove your lock and send it back to your friend. Your friend may then remove the lock she or he put on and open the box.

A container without hinges, lock or a key, yet a golden treasure lies inside me. What am I? -Riddles

Description : A container without hinges, lock or a key, yet a golden treasure lies inside me. What am I? -Riddles

Last Answer : An egg.

Broken key in the lock

Description : How to take a broken key out of the door? He doesn't look out at all. What to do? It is a door from a workshop with a classic security factory.

Last Answer : You can try to take it out with a needle, but if that doesn't work, just call the locksmith or drill it somehow.

Broken key in a car lock

Description : How will the repair work?

Last Answer : There are more options - it depends on what the lock is and how deep the key is. Push out from the inside, pull out from the outside (with hooks, pliers), drill the key and catch it with a thread ...

Are they going to open the door with the key in the lock from the inside?

Description : There is a bastard in our city and they walk around the apartments at night. There were reports that people were sleeping and he was walking in their apartment and stealing. How does he open apartments? When I'm ... I have my key out, will I get there? And what if I leave the key in the door?

Last Answer : Buying a security door is very expensive, but a chain is enough, it will hook from the inside and even if he unlocks the door with the key turned in the lock, it has another obstacle. When the thief wants, he also opens the safe: - (((Unfortunately: - (((

How to remove a key stuck in a door lock?

Description : How to remove a key stuck in a door lock?

Last Answer : Spray WD-40 into the lock.

Why do we compare enzymes and substrate to a lock and key?

Description : Why do we compare enzymes and substrate to a lock and key?

Last Answer : What is the answer ?

Which substances fit together like a lock and key?

Description : Which substances fit together like a lock and key?

Last Answer : enzymes and substrates

Are lock and key briefcases the most secure?

Description : Are lock and key briefcases the most secure?

Last Answer : A briefcase with a built-in lock is the most secure option.

‘Lock’ and ‘Key’ theory was proposed by (A) Sorenson (B) Fischer (C) Mehler (D) Sanger

Description : ‘Lock’ and ‘Key’ theory was proposed by (A) Sorenson (B) Fischer (C) Mehler (D) Sanger

Last Answer : Answer : D

The round and oblong MO stamp must always remain under lock and key in personal custody of a) Regn PA b) MO PA c) Postmaster d) None of these

Description : The round and oblong MO stamp must always remain under lock and key in personal custody of a) Regn PA b) MO PA c) Postmaster d) None of these

Last Answer : c) Postmaster

Mark correct option a) In Head Record offices one key of the safe will be retained in the custody of HRO and other one is Accountant. b) The insured seal supplied to the set of mail office should be kept in the personal custody of Head Sorting assistant c) Each set of section is supplied with a portfolio with lock & key bearing designation of section d) All the above are correct.

Description : Mark correct option a) In Head Record offices one key of the safe will be retained in the custody of HRO and other one is Accountant. b) The insured seal supplied to the set of mail office ... supplied with a portfolio with lock & key bearing designation of section d) All the above are correct.

Last Answer : d) All the above are correct.

When trying to turn a key into a lock, following is applied (A) Coplanar force (B) Non-coplanar forces (C) Couple (D) Moment

Description : When trying to turn a key into a lock, following is applied  (A) Coplanar force  (B) Non-coplanar forces  (C) Couple  (D) Moment

Last Answer : (C) Couple 

What is the role of second messenger in the mechanism of protein hormone action? -Biology

Description : What is the role of second messenger in the mechanism of protein hormone action? -Biology

Last Answer : answer:

What is the difference in action of lock out pressure signal on 6.6 kV and 220 kV breakers?

Description : What is the difference in action of lock out pressure signal on 6.6 kV and 220 kV breakers?

Last Answer : When lock out signal comes to 6.6 kV breakers the breaker will trip. Where as in case of 220 kV breakers the breaker will not trip. If the breaker is open it will be open only and can not be closed. If it is in closed condition it will be closed.

Which of the following statements are true of oxidants? A. In addition to their pathophysiologic roles in inflammation, injury, and infection, oxidants also have physiologic roles. B. Oxidants may be generated from activated neutrophils and during reperfusion following a period of ischemia. C. The deleterious effects of oxidants include lipid peroxidation and cell membrane damage, oxidative damage to DNA, and inhibition of adenosine triphosphate (ATP) synthesis. D. The mechanism of ischemia-reperfusion injury involved the catalytic production of superoxide anion (O 2•) by the enzyme xanthine oxidase.

Description : Which of the following statements are true of oxidants? A. In addition to their pathophysiologic roles in inflammation, injury, and infection, oxidants also have physiologic roles. B. Oxidants may ... involved the catalytic production of superoxide anion (O 2 ) by the enzyme xanthine oxidase.

Last Answer : Answer: ABCD DISCUSSION: Oxidants are reactive oxygen metabolites that have both physiologic and pathophysiologic roles. As potent oxidizing agents, oxidants are involved in cytochrome P ... leukocyte infiltration and activation, causing further tissue damage by the release of cytotoxic proteases

The most important mechanism of bacterial resistance to an aminoglycoside antibiotic is (a) Plasmid mediated acquisition of aminoglycoside conjugating enzyme (b) Mutational acquisition of aminoglycoside hydrolyzing enzyme (c) Mutation reducing affinity of ribosomal protein for the antibiotic (d) Mutational loss of porin channels

Description : The most important mechanism of bacterial resistance to an aminoglycoside antibiotic is (a) Plasmid mediated acquisition of aminoglycoside conjugating enzyme (b) Mutational acquisition of aminoglycoside ... affinity of ribosomal protein for the antibiotic (d) Mutational loss of porin channels

Last Answer : Ans: A

What is true of isonicotinic acid hydrazide (INH): A. An active transport mechanism concentrates INH inside sensitive mycobacteria B. Sensitive mycobacteria generate an active metabolite of INH through a catalaseperoxidase enzyme C. The most common mechanism of INH resistance is mutation i

Description : What is true of isonicotinic acid hydrazide (INH): A. An active transport mechanism concentrates INH inside sensitive mycobacteria B. Sensitive mycobacteria generate an active metabolite of INH through a catalaseperoxidase enzyme C. The most common mechanism of INH resistance is mutation i

Last Answer : D. Both 'A' and 'B' are correct

The most important mechanism of bacterial resistance to an aminoglycoside antibiotic is: A. Plasmid mediated acquisition of aminoglycoside conjugating enzyme B. Mutational acquisition of aminoglycoside hydrolysing enzyme C. Mutation reducing affinity of ribosomal protein for the antibiotic D. Mutational loss of porin channels

Description : The most important mechanism of bacterial resistance to an aminoglycoside antibiotic is: A. Plasmid mediated acquisition of aminoglycoside conjugating enzyme B. Mutational acquisition of aminoglycoside ... affinity of ribosomal protein for the antibiotic D. Mutational loss of porin channels

Last Answer : A. Plasmid mediated acquisition of aminoglycoside conjugating enzyme

The most common mechanism of development of resistance to fluoroquinolones is: A. Chromosomal mutation altering affinity of target site B. Plasmid transfer C. Acquisition of drug destroying enzyme D. Acquisition of alternative metabolic pathway

Description : The most common mechanism of development of resistance to fluoroquinolones is: A. Chromosomal mutation altering affinity of target site B. Plasmid transfer C. Acquisition of drug destroying enzyme D. Acquisition of alternative metabolic pathway

Last Answer : A. Chromosomal mutation altering affinity of target site

Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system. C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Description : Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly ... increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Last Answer : C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.

Which of the following is a key mechanism for protecting data? a) Access control b) Auditing c) Authentication d) All of the mentioned

Description : Which of the following is a key mechanism for protecting data? a) Access control b) Auditing c) Authentication d) All of the mentioned

Last Answer : All of the mentioned

How is Orencia (abatacept) different from Enbrel, Humira, Remicade, and Anakinra? What is its mechanism of action?

Description : How is Orencia (abatacept) different from Enbrel, Humira, Remicade, and Anakinra? What is its mechanism of action?

Last Answer : Are these drugs? What do they purport to treat? None of the names sound familiar to me.

What is Xanax (Alprazolam)mechanism of action - Genericambienonline?

Description : What is Xanax (Alprazolam)mechanism of action - Genericambienonline?

Last Answer : In this pandemic, it's very natural for the person to be surrounded with much anxiety and panic. Both the professional and personal lives do suffer due to anxiety and panic that a person takes. ... individual. Life events like the death of a close one, suffering from a severe medical ailment. Even

During mechanism of action of insulin, protein kinase C is activated by

Description : During mechanism of action of insulin, protein kinase C is activated by

Last Answer : During mechanism of action of insulin, protein kinase C is activated by A. `PIP_2` B. `IP_3` C. `DG ` D. `Ca^(2+)`

What is pentazocaine's mechanism of action?

Description : What is pentazocaine's mechanism of action?

Last Answer : Pentazocaine acts on kappa-opioid receptors and partially actson mu-opioid receptors of the central nervous system. This leads tothe ascending pathway of pain being inhibited resulting inanalgesia, sedating, and respiratory depression.

What is pentazocaine's mechanism of action?

Description : What is pentazocaine's mechanism of action?

Last Answer : Pentazocaine acts on kappa-opioid receptors and partially actson mu-opioid receptors of the central nervous system. This leads tothe ascending pathway of pain being inhibited resulting inanalgesia, sedating, and respiratory depression.

What is the mechanism of action of hormones?

Description : What is the mechanism of action of hormones?

Last Answer : activation of mRNA, which increases protein synthesis in the cell

Antibacterial agents can be classified with regard to their structure, mechanism of action, and activity pattern against various types of bacterial pathogens. Which of the following statement(s) is/are true concerning antimicrobial classes? a. Penicillins and cephalosporins share the compound structure of a b-lactam ring which binds to bacterial division plate proteins b. Tetracyclines and macrolides such as erythromycin inhibit bacterial ribosomal activity and therefore protein synthesis c. Aminoglycosides act in a similar fashion to tetracyclines and therefore are both bacteriostatic d. Sulfonamides and trimethoprim act synergistically to inhibit purine synthesis

Description : Antibacterial agents can be classified with regard to their structure, mechanism of action, and activity pattern against various types of bacterial pathogens. Which of the following ... are both bacteriostatic d. Sulfonamides and trimethoprim act synergistically to inhibit purine synthesis

Last Answer : Answer: a, b, d Penicillins, cephalosporins, and monobactams possess a b-lactam ring of some type and act to bind bacterial division plate proteins, thus inhibiting cell wall ... act in different mechanisms to inhibit protein synthesis, therefore two agents in combination act synergistically

Mini-dose heparin has been shown to be useful in the prophylaxis of postoperative venous thrombosis. Mechanism(s) by which low-dose heparin is/are thought to protect against venous thrombosis include: a. Enhancement of antithrombin III activity b. A decrease in thrombin availability c. Inhibition of platelet aggregation and subsequent platelet release action d. A mild prolongation of activated partial thromboplastin time

Description : Mini-dose heparin has been shown to be useful in the prophylaxis of postoperative venous thrombosis. Mechanism(s) by which low-dose heparin is/are thought to protect against venous ... aggregation and subsequent platelet release action d. A mild prolongation of activated partial thromboplastin time

Last Answer : Answer: a, b, c Low-dose heparin is thought to protect against venous thrombosis through three different mechanisms. First, antithrombin III activity with its inhibition of activated Factor X is ... release reaction. The standard doses of heparin administered (5000 units bid) does not affect aPTT

The biochemical mechanism of action of digitalis is associated with (a) A decrease in calcium uptake by the sarcoplasmic reticulum (b) An increase in ATP synthesis (c) A modification of the actin molecule (d) An increase in systolic intracellular calcium levels (e) A block of sodium/calcium exchange

Description : The biochemical mechanism of action of digitalis is associated with (a) A decrease in calcium uptake by the sarcoplasmic reticulum (b) An increase in ATP synthesis (c) A modification of the actin molecule (d) An increase in systolic intracellular calcium levels (e) A block of sodium/calcium exchange

Last Answer : Ans: D

Which of the following best describes the mechanism of action of scopolamine ? (a) Irreversible antagonist at nicotinic receptors (b) Irreversible antagonist at muscarinic receptors (c) Physiologic antagonist at muscarinic receptors (d) Reversible antagonist at muscarinic receptors (e) Reversible antagonist at nicotinic receptors

Description : Which of the following best describes the mechanism of action of scopolamine ? (a) Irreversible antagonist at nicotinic receptors (b) Irreversible antagonist at muscarinic receptors (c) ... receptors (d) Reversible antagonist at muscarinic receptors (e) Reversible antagonist at nicotinic receptors

Last Answer : Ans: D