Question 1

Which reaction is catalyzed by LDH?

Accepted Answer

Lactate dehydrogenase (LDH) catalyzes the conversion of pyruvic acid to lactic acid using NADH, producing NAD in the process.

Question 2

The amount of substrate converted to product per unit of time is called the

Accepted Answer

The reaction velocity refers to the rate at which substrate is converted to product per unit of time in a chemical reaction.

Question 3

Turnover number (k_cat) describes what property of an enzymatic reaction?

Accepted Answer

Turnover number (k_cat) describes the catalytic effectiveness of an enzymatic reaction, which is the number of substrate molecules converted to product per unit time by a single enzyme molecule.

Question 4

The likelihood that an enzyme will form a complex with the substrate during a collision is called the

Accepted Answer

Enzyme-substrate affinity refers to the likelihood or strength of the interaction between an enzyme and its substrate, determining how readily they form a complex during a collision.

Question 5

An enzymatic reaction is proceeding at subsaturation. Which of the following is not a means by which the enzymatic reaction can be increased?

Accepted Answer

The answer of An enzymatic reaction is proceeding at subsaturation....

Question 6

Refer to the figure shown.
 Which of the following represent the best labels for the x axis and the y axis in the figure?

Accepted Answer

The answer of Refer to the figure shown.
 Which of...

Question 7

Refer to the figure shown.
 Which letter in the figure represents high affinity?

Accepted Answer

The answer of Refer to the figure shown.
 Which letter...

Question 8

Refer to the figure shown. Which letter in the figure best represents the V_max?

Accepted Answer

The answer of Refer to the figure shown.
 Which letter...

Question 9

Refer to the figure shown. In the figure, which region best represents the K_m of the highest affinity enzyme?

Accepted Answer

The answer of Refer to the figure shown.
 In the...

Question 10

Refer to the figure shown.
 If more substrate is added to the reaction system of line C in the figure, what would be the most likely outcome?

Accepted Answer

The answer of Refer to the figure shown.
 If more...

Question 11

Human LDH-B₄ and rat LDH-B₄ are examples of

Accepted Answer

Human LDH-B4 and rat LDH-B4 are interspecific enzyme homologs because they are the same enzyme (lactate dehydrogenase B4) found in different species (human and rat), sharing a common evolutionary origin.

Question 12

An enzyme-encoding gene is considered to be _______ within a cell if the gene results in the synthesis of the encoded enzyme within that same cell.

Accepted Answer

The term "expressed" refers to the process by which a gene is transcribed and translated into a protein, such as an enzyme, within the same cell.

Question 13

_______ enzymes are present in a tissue in relatively high and steady amounts regardless of conditions, whereas _______ enzymes are present at low levels (or not at all) in a tissue unless their synthesis is activated.

Accepted Answer

Constitutive enzymes are consistently present in high amounts, while inducible enzymes are synthesized in response to specific stimuli.

Question 14

Which statement regarding allosteric modulation is true?

Accepted Answer

Allosteric modulation involves the binding of a modulator at a site other than the active site, and this binding follows the law of mass action, meaning it is reversible and depends on the concentration of the modulator.

Question 15

Which of the following is directly involved in covalent modulation?

Accepted Answer

Protein kinases are directly involved in covalent modulation as they catalyze the transfer of phosphate groups to proteins, altering their activity.

Question 16

Refer to the figure shown.
 How many different enzymes are catalyzing reactions?

Accepted Answer

The answer of Refer to the figure shown.
 How many...

Question 17

Refer to the figure shown.
 According to the figure, a high number of products from the Kreb's cycle could act as _______ and result in _______ of the overall reaction.

Accepted Answer

The answer of Refer to the figure shown.
 According to...

Question 18

A protein kinase catalyzes the phosphorylation of another protein kinase, which in turn catalyzes the phosphorylation of a third protein kinase. This series of multiple enzyme sequences is an excellent example of

Accepted Answer

This series of phosphorylation events is an example of amplification, where a single activation event leads to a cascade of multiple downstream activations, greatly increasing the signal.

Question 19

The _______ is(are) directly responsible for the amplifying effects during a second messenger cascade.

Accepted Answer

Enzymes are directly responsible for the amplifying effects during a second messenger cascade as they catalyze reactions that produce multiple molecules of the second messenger, leading to signal amplification.

Question 20

Refer to the figure shown.
 Which abiotic factor most likely explains the data in the figure?

Accepted Answer

The answer of Refer to the figure shown.
 Which abiotic...

Quiz 2: Molecules and Cells in Animal Physiology

Which reaction is catalyzed by LDH?

The amount of substrate converted to product per unit of time is called the

Turnover number (k_cat) describes what property of an enzymatic reaction?

The likelihood that an enzyme will form a complex with the substrate during a collision is called the

An enzymatic reaction is proceeding at subsaturation. Which of the following is not a means by which the enzymatic reaction can be increased?

Refer to the figure shown. Which of the following represent the best labels for the x axis and the y axis in the figure?

Refer to the figure shown. Which letter in the figure represents high affinity?

Refer to the figure shown. Which letter in the figure best represents the V_max?

Refer to the figure shown. In the figure, which region best represents the K_m of the highest affinity enzyme?

Refer to the figure shown. If more substrate is added to the reaction system of line C in the figure, what would be the most likely outcome?

Human LDH-B₄ and rat LDH-B₄ are examples of

An enzyme-encoding gene is considered to be _______ within a cell if the gene results in the synthesis of the encoded enzyme within that same cell.

_ enzymes are present in a tissue in relatively high and steady amounts regardless of conditions, whereas _ enzymes are present at low levels (or not at all) in a tissue unless their synthesis is activated.

Which statement regarding allosteric modulation is true?

Which of the following is directly involved in covalent modulation?

Refer to the figure shown. How many different enzymes are catalyzing reactions?

Refer to the figure shown. According to the figure, a high number of products from the Kreb's cycle could act as _ and result in _ of the overall reaction.

A protein kinase catalyzes the phosphorylation of another protein kinase, which in turn catalyzes the phosphorylation of a third protein kinase. This series of multiple enzyme sequences is an excellent example of

The _______ is(are) directly responsible for the amplifying effects during a second messenger cascade.

Refer to the figure shown. Which abiotic factor most likely explains the data in the figure?

Quiz 2: Molecules and Cells in Animal Physiology

Which reaction is catalyzed by LDH?

The amount of substrate converted to product per unit of time is called the

Turnover number (kcat) describes what property of an enzymatic reaction?

The likelihood that an enzyme will form a complex with the substrate during a collision is called the

An enzymatic reaction is proceeding at subsaturation. Which of the following is not a means by which the enzymatic reaction can be increased?

Refer to the figure shown. Which of the following represent the best labels for the x axis and the y axis in the figure?

Refer to the figure shown. Which letter in the figure represents high affinity?

Refer to the figure shown. Which letter in the figure best represents the Vmax?

Refer to the figure shown. In the figure, which region best represents the Km of the highest affinity enzyme?

Refer to the figure shown. If more substrate is added to the reaction system of line C in the figure, what would be the most likely outcome?

Human LDH-B4 and rat LDH-B4 are examples of

An enzyme-encoding gene is considered to be _______ within a cell if the gene results in the synthesis of the encoded enzyme within that same cell.

_______ enzymes are present in a tissue in relatively high and steady amounts regardless of conditions, whereas _______ enzymes are present at low levels (or not at all) in a tissue unless their synthesis is activated.

Which statement regarding allosteric modulation is true?

Which of the following is directly involved in covalent modulation?

Refer to the figure shown. How many different enzymes are catalyzing reactions?

Refer to the figure shown. According to the figure, a high number of products from the Kreb's cycle could act as _______ and result in _______ of the overall reaction.

A protein kinase catalyzes the phosphorylation of another protein kinase, which in turn catalyzes the phosphorylation of a third protein kinase. This series of multiple enzyme sequences is an excellent example of

The _______ is(are) directly responsible for the amplifying effects during a second messenger cascade.

Refer to the figure shown. Which abiotic factor most likely explains the data in the figure?

Turnover number (k_cat) describes what property of an enzymatic reaction?

Refer to the figure shown. Which letter in the figure best represents the V_max?

Refer to the figure shown. In the figure, which region best represents the K_m of the highest affinity enzyme?

Human LDH-B₄ and rat LDH-B₄ are examples of

_ enzymes are present in a tissue in relatively high and steady amounts regardless of conditions, whereas _ enzymes are present at low levels (or not at all) in a tissue unless their synthesis is activated.

Refer to the figure shown. According to the figure, a high number of products from the Kreb's cycle could act as _ and result in _ of the overall reaction.