Oxygen diffuses through this structure, but a sodium ion may need active transport. Which structure is this statement most likely referring to?

Oxygen diffuses through this structure, but a sodium ion may need active transport. Which structure is this statement most likely referring to?
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A semipermeable membrane (APEX)
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There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s) is/are true concerning energy converting transport? a. The site of energy conversion and transport in the plasma membrane involves the phospholipid component b. The Na+-K++-ATPase derives energy from hydrolysis of extracellular ATP c. In some systems, energy inherent in the transmembrane ion gradient can be used to drive transport of a second species d. Examples of species transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose

Description : There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s ... transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose

Last Answer : Answer: c, d The selectivity of the plasma membrane, although impressive, cannot account for the nonequilibrium composition of living cells. A cell can be maintained in a nonequilibrium state only by ... to drive the transport of a second species such as protons, calcium, amino acids, or glucose

Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta  americana as it enters the animal body? (a) Spiracle in metathorax, trachea, tracheoles, oxygen diffuses into cells (b) Mouth, bronchial tube, trachea, oxygen enters cells (c) Spiracles in prothorax, tracheoles, trachea, oxygen diffuses into cells (d) Hypopharynx, mouth, pharynx, trachea, tissues

Description : Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta  americana as it enters the animal body? (a) Spiracle in ... prothorax, tracheoles, trachea, oxygen diffuses into cells (d) Hypopharynx, mouth, pharynx, trachea, tissues

Last Answer : (a) Spiracle in metathorax, trachea, tracheoles, oxygen diffuses into cells

During osmosis w) Pure solvent diffuses through a membrane but solutes do not. x) Pure solutes diffuse through a membrane but solvent does not. y) Pure solvent and a solution both diffuse at the same time through a membrane. z) Gases diffuse through a membrane into a solution and build up pressure.

Description : During osmosis w) Pure solvent diffuses through a membrane but solutes do not. x) Pure solutes diffuse through a membrane but solvent does not. y) Pure solvent and a solution both diffuse at the same time through a membrane. z) Gases diffuse through a membrane into a solution and build up pressure. 

Last Answer : ANSWER: W -- PURE SOLVENT DIFFUSES THROUGH A MEMBRANE BUT SOLUTES DO NOT. 

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction. (a) Calcium (b) Magnesium (c) Sodium (d) Potassium

Description : Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction. (a) Calcium (b) Magnesium (c) Sodium (d) Potassium

Last Answer : (a) Calcium

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant duri

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Last Answer : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal ... durign day time, and the other at night.

Water vapour comes out from the plant leaf through the stomatal opening. Through the samestomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options. (a) The above processes happen only during night time. (b) One process occurs during day time and the other at night. (c) Both processes cannot happen simultaneously. (d) Both processes can happen together because the diffusion coefficient of water and CO2 is different

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Enrichment of uranium by gaseous diffusion relies on the fact that uranium-235 diffuses through holes in the barriers more readily than uranium-238 does because uranium-235 is: w) a different chemical compound. x) a different wavelength. y) resistant to magnetism. z) slightly lighter than uranium-238.

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Last Answer : ANSWER: Z -- SLIGHTLY LIGHTER THAN URANIUM-238.

On a dry day, water diffuses out of the intercellula spaces of the leaf through what part of the leaf?

Description : On a dry day, water diffuses out of the intercellula spaces of the leaf through what part of the leaf?

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Which of the following statement(s) is/are true concerning carbon dioxide kinetics? a. The amount of carbon dioxide produced is equivalent to the amount of oxygen consumed b. Carbon dioxide levels in blood, present mostly as a bicarbonate ion, can quickly change c. Normally the amount of carbon dioxide excreted through the lung is exactly equal to the amount of carbon dioxide produced in peripheral tissues d. The amount of carbon dioxide excreted is a function of ventilation of perfused alveoli

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Last Answer : Answer: a, c, d The total amount of carbon dioxide produced by systemic metabolism is roughly equivalent to the amount of oxygen consumed (100-120 cc/m2/min, 200 cc/min in a typical ... carbon dioxide excreted is a function of ventilation of perfused alveoli (i.e. the alveolar ventilation/min).

Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport

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Last Answer : (D) Active transport

Metronidazole is selectively active against anaerobic organisms because: A. Aerobes have an active transport mechanism to pump it out of their cell B. Only anaerobes reduce it to generate the reactive nitro radical C. It is rapidly inactivated in the presence of oxygen D. It binds to DNA of anaerobes with high affinity

Description : Metronidazole is selectively active against anaerobic organisms because: A. Aerobes have an active transport mechanism to pump it out of their cell B. Only anaerobes reduce it to generate the reactive ... inactivated in the presence of oxygen D. It binds to DNA of anaerobes with high affinity

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When Thomas Jefferson wrote all men are equal to whom was he likely referring to?

Description : When Thomas Jefferson wrote all men are equal to whom was he likely referring to?

Last Answer : He meant “mankind “ was created equal. His reference doesn’tmean what we think today because of the difference in time and theworld. In his world no one was equal and everyone was below theking.

When Thomas Jefferson wrote all men are equal to whom was he likely referring to?

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During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

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During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

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Which of the following product of PIP`""_(2)` diffuses into the cytoplasm triggering the release of `Ca^(2+)` for intracellular calcium-mediated proce

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Why nitrogen diffuses faster in high temperature?

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Last Answer : Higher temperatures mean more heat energy which translates intomore kinetic energy of the molecules of nitrogen gas. This greaterkinetic energy allows the molecules to diffuse faster than at alower temperature and lower kinetic energy.

What molecule diffuses into the chloroplast that is needed for the Calvin cycle?

Description : What molecule diffuses into the chloroplast that is needed for the Calvin cycle?

Last Answer : What is the answer ?

All the following statements regarding calcium are correct except (A) It diffuses as a divalent cation (B) It freely diffuses across the endoplasmic reticulum of muscle cells (C) It can exist in the blood as ionic form and also protein bound (D) It is found in high concentration in bones

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Hydrogen diffuses . . . . . . . . . . chlorine (a) Faster than (b) Slower than (c) At the same rate as (d) None of these

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Most of the carbon dioxide picked up by the blood in the tissues: a) dissolves in the plasma b) unites with hemoglobin c) forms microscopic bubbles d) diffuses into the alveoli

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Which of the following statement(s) is/are true concerning oxygen kinetics in a critically ill, febrile patient? a. Oxygen consumption will likely exceed three times normal b. The high cardiac output and pulse rate are designed to increase oxygen delivery c. The hyperdynamic response may actually increase oxygen delivery to exceed the increase in oxygen consumption d. The patient can maintain adequate compensation as long as the oxygen delivery/oxygen consumption rate is greater than 2:1

Description : Which of the following statement(s) is/are true concerning oxygen kinetics in a critically ill, febrile patient? a. Oxygen consumption will likely exceed three times normal b. The high cardiac ... adequate compensation as long as the oxygen delivery/oxygen consumption rate is greater than 2:1

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Consider the following statements. (A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group. (B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme. Select the correct option. (a) (A) is false but (B) is true. (b) Both (A) and (B) are true. (c) (A) is true but (B) is false. (d) Both (A) and (B) are false

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Choose the correct statement(s) about auranofin: A. It is an orally active gold compound B. It is equally effective but less toxic than injected gold-sodium-thiomalate C. Its major adverse effect is dermatitis D. All of the above are correct

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Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature? (1) They do not need to reproduce. (2) They are somatic cells. (3) They do not metabolise. (4) All their internal space is available for oxygen transport. (a) Only (1) (b) (1), (3) and (4) (c) (2) and (3) (d) Only (4)

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Last Answer : (d) Only (4)

Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature ? (a) They do not need to reproduce (b) They are somatic cells (c) They do not metabolize (d) All their internal space is available for oxygen transport (1) only (a) (2) (a), (c) and (d) (3) (b) and (c) (4) only (d)

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What do you call the tactic or behavior when someone makes a vague accusation along with a statement like "and yes, you do know what I'm talking about" when you have no clue what they're referring to, and they won't tell you?

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Last Answer : Could you have received the text accidentally? Maybe it was a misfire? But I have no idea what that would be called.

Indicate the false statement A. The noise generated in a resistance or the resistive component of any impedance is random. B. Random noise power is proportional to the bandwidth over which is measured C. A random voltage across the resistor does not exist D. All formula referring to random noise are applicable only to the value of such noise.

Description : Indicate the false statement A. The noise generated in a resistance or the resistive component of any impedance is random. B. Random noise power is proportional to the bandwidth over which is measured ... exist D. All formula referring to random noise are applicable only to the value of such noise.

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Referring of given figure, pick up the correct statement from the following: (A) The total length of centre line of four walls is 20 m (B) Length of long wall out-to-out is 6.80 m (C) Length of short walls in-to-in is 3.20 m (D) All the above

Description : Referring of given figure, pick up the correct statement from the following: (A) The total length of centre line of four walls is 20 m (B) Length of long wall out-to-out is 6.80 m (C) Length of short walls in-to-in is 3.20 m (D) All the above

Last Answer : (D) All the above

The fatty acids can be transported into and out of mitochondria through (A) Active transport (B) Facilitated transfer (C) Non-facilitated transfer (D) None of these

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Which are the molecules that make possible active transport through membranes ?

Description : Which are the molecules that make possible active transport through membranes ?

Last Answer : Active transport is made by specific membrane proteins. These proteins are called “pumps” because they “pump” the moving substance through the membrane using energy from ATP molecules.

What is the energy source used in active transport through biological membranes ?

Description : What is the energy source used in active transport through biological membranes ?

Last Answer : The energy necessary for active transport (against the concentration gradient of the transported substance) to occur comes from ATP molecules. The active transportation uses chemical energy from ATP.

Glucose is taken back from glomerular filtrate through (a) active transport (b) passive transport (c) osmosis (d) diffusion

Description : Glucose is taken back from glomerular filtrate through (a) active transport (b) passive transport (c) osmosis (d) diffusion

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Fructose is absorbed into the blood through mucosa cells of intestine by the process called (a) active transport (b) facilitated transport (c) simple diffusion (d) co-transport mechanism.

Description : Fructose is absorbed into the blood through mucosa cells of intestine by the process called (a) active transport (b) facilitated transport (c) simple diffusion (d) co-transport mechanism.

Last Answer : (b) facilitated transport

Which of the following is not a feature of active transport of solutes in plants ? (a) Occurs against concentration gradient (b) Non-selective (c) Occurs through membranes (d) Requires ATP

Description : Which of the following is not a feature of active transport of solutes in plants ? (a) Occurs against concentration gradient (b) Non-selective (c) Occurs through membranes (d) Requires ATP

Last Answer : Non-selective

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

Which can function as carrier in active ion absorption? (a) Feradoxin (b) Plastoquinone (c) Cytochrome (d) Lecithin

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Last Answer : Ans. ((d))

By which of the following means antifungal chemotherapeutic agents may affect fungi? A- Interfere with nuclear division by preventing the aggregation of microtubules needed for mitosis B- Interfere with normal nucleic acid synthesisInterfere with ergosterol biosynthesis and thus alter the structure of the cytoplasmic C- membrane as well as the function of several membrane-bound enzymes like thoseinvolved in nutrient transport and chitin synthesis D- all of these

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Last Answer : all of these

The transport of proteins out of the cell is termed exocytosis. Which of the following statement(s) is/are true concerning this process? a. Secretory vesicles fuse with the plasma membrane b. The process can occur in either a constitutive or regulated process c. A regulated secretion is triggered by a stimulus, most likely a hormone or a neurotransmitter d. A decrease in cytoplasmic calcium occurs as part of the secretion process

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Last Answer : Answer: a, b, c Transport vesicles that bud off the Golgi network carry both material to be secreted from the cell and protein destined to become components of the plasma ... but may also involve generation of diacylglycerol or production of cyclic AMP which activate kinases or phosphatases

Identify the wrong statement with reference to transport of oxygen. (a) Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. (b) Partial pressure of CO2 can interfere with O2 binding with haemoglobin. (c) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin. (d) Low pCO2 in alveoli favours the formation of oxyhaemoglobin.

Description : Identify the wrong statement with reference to transport of oxygen. (a) Binding of oxygen with haemoglobin is mainly related to partial pressure of O2. (b) Partial pressure of CO2 can interfere ... the formation of oxyhaemoglobin. (d) Low pCO2 in alveoli favours the formation of oxyhaemoglobin.

Last Answer : (c) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin.

Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number. -Science

Description : Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number. -Science

Last Answer : Atomic number of sodium (Z) =11 Mass number of sodium (A) = 23 Number of protons in the nucleus = 11 Number of neutrons in the nucleus =23-11 = 12 Number of electrons = 11 Electronic ... the electronic configuration is 2, 8(K, L). However, the number of protons and neutrons remains the same.

You and your study partner want of draw the pathway that controls the controls the reabsorption of sodium ion when blood pressure falls. Which of the

Description : You and your study partner want of draw the pathway that controls the controls the reabsorption of sodium ion when blood pressure falls. Which of the

Last Answer : You and your study partner want of draw the pathway that controls the controls the reabsorption of sodium ion when blood ... ,c,e,a,b D. b,d,c,a,e

`50 mL` of `0.1 M` solution of a salt reacted with `25 mL` of `0.1 M` solution of sodium sulphite. The half reaction for the oxidation of sulphite ion

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What and happens when a sodium ion is attracted to a chlorine ion?

Description : What and happens when a sodium ion is attracted to a chlorine ion?

Last Answer : Need answer

The ion which activates salivary amylase activity is (A) Chloride (B) Bicarbonate (C) Sodium (D) Potassium

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Last Answer : Answer : A

The ion that is required in trace amounts for the growth of bacteria is a. Calcium b. Magnesium c. Cobalt d. Sodium

Description : The ion that is required in trace amounts for the growth of bacteria is a. Calcium b. Magnesium c. Cobalt d. Sodium

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When a photon strikes the rhodopsin: a. bleaching occurs b. retinal molecules are bound to rhodopsin c. the intracellular cGMP is increased d. the sodium ion channels are closed

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Last Answer : the sodium ion channels are closed

The following are true about rods in darkness: a. there is tonic release of neurotransmitters b. the sodium ion channels are open c. the potassium ion channels are shut d. there is a net influx of sodium ions

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Last Answer : there is a net influx of sodium ions

Human urine is usually acidic because (a) potassium and sodium exchange generates acidity (b) hydrogen ions are actively secreted into the filtrate (c) the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries (d) excreted plasma proteins are acidic.

Description : Human urine is usually acidic because (a) potassium and sodium exchange generates acidity (b) hydrogen ions are actively secreted into the filtrate (c) the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries (d) excreted plasma proteins are acidic.

Last Answer : (b) hydrogen ions are actively secreted into the filtrate

Which is the modified form of batteries in today’s electronic cars? A. Lithium ion B. Nickel iron C. Lead Acid D. Sodium Nitrate

Description : Which is the modified form of batteries in today’s electronic cars? A. Lithium ion B. Nickel iron C. Lead Acid D. Sodium Nitrate

Last Answer : A. Lithium ion