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

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

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 ?

‘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

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

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

What characteristics of enzymes makes them specific for substrate?

Description : What characteristics of enzymes makes them specific for substrate?

Last Answer : shape of their active site make them specific for thesubstrates

A substrate for enzymes of pyrimidine nucleotide biosynthesis is (A) Allopurinol (B) Tetracylin (C) Chloramphenicol (D) Puromycin

Description : A substrate for enzymes of pyrimidine nucleotide biosynthesis is (A) Allopurinol (B) Tetracylin (C) Chloramphenicol (D) Puromycin

Last Answer : Answer : A

Which one of the following statements is not characteristic of allosteric enzymes? (A) They frequently catalyze a committed step early in a metabolic pathway (B) They are often composed of subunits (C) They follow Michaelis-Menten kinetics (D) They frequently show cooperativity for substrate binding

Description : Which one of the following statements is not characteristic of allosteric enzymes? (A) They frequently catalyze a committed step early in a metabolic pathway (B) They are often composed of subunits (C) They follow Michaelis-Menten kinetics (D) They frequently show cooperativity for substrate binding

Last Answer : Answer : C

Enzymes activity is controlled by (A) pH of the solution (B) Temperature (C) Concentration of the enzyme (D) Concentration of the substrate (E) All of these

Description : Enzymes activity is controlled by (A) pH of the solution (B) Temperature (C) Concentration of the enzyme (D) Concentration of the substrate (E) All of these

Last Answer : Answer : C

If a coenzyme is required in an enzyme reaction, the former usually has the function of (A) Acting as an acceptor for one of the cleavage products of the substrate (B) Enhancing the specificity of the apo enzyme (C) Increasing the number of receptor sites of the apo enzyme (D) Activating the substrate ENZYMES 167

Description : If a coenzyme is required in an enzyme reaction, the former usually has the function of (A) Acting as an acceptor for one of the cleavage products of the substrate (B) Enhancing the specificity ... C) Increasing the number of receptor sites of the apo enzyme (D) Activating the substrate ENZYMES 167

Last Answer : Answer : A

Which of the following enzymes incorporates inorganic phosphate into the substrate? (A) Phosphoglycerate kinase (B) Glyceraldehyde-3-phosphate dehydrogenase (C) Pyruvate kinase (D) Enolase

Description : Which of the following enzymes incorporates inorganic phosphate into the substrate? (A) Phosphoglycerate kinase (B) Glyceraldehyde-3-phosphate dehydrogenase (C) Pyruvate kinase (D) Enolase

Last Answer : Answer : A

Enzymes requiring NAD as co-substrate can be assayed by measuring change in absorbance at (A) 210 nm (B) 290 nm (C) 340 nm (D) 365 nm

Description : Enzymes requiring NAD as co-substrate can be assayed by measuring change in absorbance at (A) 210 nm (B) 290 nm (C) 340 nm (D) 365 nm

Last Answer : Answer : C

If all the enzymes, intermediates and cofactors of the citric acid cycle as well as an excess of the starting substrate acetylCoA are present and functional in an organelle free solution at the appropriate pH, which of the following factors of the citric acid cycle would prove to be rate limiting? (A) Molecular oxygen (B) Half life of enzyme (C) Turnover of intermediates (D) Reduction of cofactors

Description : If all the enzymes, intermediates and cofactors of the citric acid cycle as well as an excess of the starting substrate acetylCoA are present and functional in an organelle free solution at the appropriate ... oxygen (B) Half life of enzyme (C) Turnover of intermediates (D) Reduction of cofactors

Last Answer : Answer : D

Lineweaver – Burk double reciprocal plot is related to (A) Substrate concentration (B) Enzyme activity (C) Temperature (D) Both (A) and (B) ENZYMES 145

Description : Lineweaver – Burk double reciprocal plot is related to (A) Substrate concentration (B) Enzyme activity (C) Temperature (D) Both (A) and (B) ENZYMES 145

Last Answer : Answer : D

Regulator gene controls chemical synthesis (Operon concept) by (a) Inhibiting transcription of mRNA (b) Inhibiting enzymes (c) Inhibiting passage of mRNA (d) Inhibiting substrate enzyme reaction

Description : Regulator gene controls chemical synthesis (Operon concept) by (a) Inhibiting transcription of mRNA (b) Inhibiting enzymes (c) Inhibiting passage of mRNA (d) Inhibiting substrate enzyme reaction

Last Answer : Ans. ((a))

Which factor is responsible for inhibition of enzymatic process during feedback? (a) Substrate (b) Enzymes (c) End product (d) Temperature

Description : Which factor is responsible for inhibition of enzymatic process during feedback? (a) Substrate (b) Enzymes (c) End product (d) Temperature

Last Answer : (c) End product

Enzymes combine with a ___________at the___________ site to lower the activation energy. a. Substrate; Active b. Product; Noncompetitive c. Product; Active d. Coenzyme; Active

Description : Enzymes combine with a ___________at the___________ site to lower the activation energy. a. Substrate; Active b. Product; Noncompetitive c. Product; Active d. Coenzyme; Active

Last Answer : a. Substrate; Active

Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of hepatocytes C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

Description : Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of ... C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

Last Answer : D. Increased synthesis of enzyme protein

Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of hepatocytes C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

Description : Induction of drug metabolizing enzymes involves: A. A conformational change in the enzyme protein to favour binding of substrate molecules B. Expression of enzyme molecules on the surface of ... C. Enhanced transport of substrate molecules into hepatocytes D. Increased synthesis of enzyme protein

Last Answer : D. Increased synthesis of enzyme protein

Which of the following human digestive enzymes is incorrectly matched to its substrate? a) pepsin - protein b) trypsin - starch (pron: TRIP-sin) c) pancreatic amylase - starch (pron: AM-i-lase) d) lipase - fat e) maltase - maltose.

Description : Which of the following human digestive enzymes is incorrectly matched to its substrate? a) pepsin - protein b) trypsin - starch (pron: TRIP-sin) c) pancreatic amylase - starch (pron: AM-i-lase) d) lipase - fat e) maltase - maltose.

Last Answer : ANSWER: B -- TRYPSIN - STARCH

Contrast and compare competitive inhibitors with noncompetitive inhibitors. Which can be overcome by the addition of more substrate?

Description : Contrast and compare competitive inhibitors with noncompetitive inhibitors. Which can be overcome by the addition of more substrate?

Last Answer : Competitive inhibitors reduce the productivity of enzymes by blocking substrates from entering active sites. This inhibition is what can be overcome by the addition of more substrate. Noncompetitive ... active site will become less and less effective at helping convert substrate to product.

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.

Lock and Key mechanism of enzyme action? -Biology

Description : Lock and Key mechanism of enzyme action? -Biology

Last Answer : answer:

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.

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.

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

‘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 

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

Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine

Description : Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine

Last Answer : Answer : D

What are the key gluconeogenic enzymes?

Description : What are the key gluconeogenic enzymes?

Last Answer : Pyruvate carboxylase, Phospho enol pyruvate carboxy kinase, Fructose-1,6-bisphosphatase and Glucose-6-phosphatase. 

What are key glycolytic enzymes?

Description : What are key glycolytic enzymes? 

Last Answer : Glucokinase, Phospho fructo kinase, Pyruvate kinase. 

Double doors: Do we only want to use the door they locked, or, do they lock the door everyone wants to use?

Description : Double doors: Do we only want to use the door they locked, or, do they lock the door everyone wants to use?

Last Answer : I know that sorta pisses me off at times I will just unlock the locked one. I could never figure out why they couldn’t just unlock both.

When traveling to Puerto Rico are we allowed to lock our luggage?

Description : When traveling to Puerto Rico are we allowed to lock our luggage?

Last Answer : From where?