Q: Which of the following is a correct representation of the overall reaction for cellular respiration?

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}$

Question 1

Which of the following best describes the amphipathic nature of phospholipids and its significance in biological membranes?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, which enables the formation of a bilayer that is selectively permeable to different substances.

Question 2

A cell is placed in a solution with a lower solute concentration than its cytoplasm. What will most likely happen to the cell, and which term best describes the solution?

Accepted Answer

Water will move into the cell; the solution is hypotonic.

Question 3

Which of the following factors would most increase the fluidity of a phospholipid bilayer at room temperature?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in the phospholipids.

Question 4

Which equation correctly represents the net movement of water during osmosis?

Accepted Answer

$\Delta \Psi = \Psi_{outside} - \Psi_{inside}$

Question 5

A mutation disables the Na$^+$/K$^+$-ATPase pump in a cell. What is the most likely consequence for glucose transport via the Na$^+$/glucose cotransporter?

Accepted Answer

Glucose transport will decrease because the sodium gradient required for cotransport will be lost.

Question 6

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient without energy input.

Question 7

Which of the following best explains why enzymes increase the rate of chemical reactions?

Accepted Answer

Enzymes lower the activation energy ($E_a$) required for the reaction to proceed.

Question 8

Which of the following is a correct representation of the overall reaction for cellular respiration?

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$

Question 9

During the electron transport chain, which molecule acts as the final electron acceptor?

Accepted Answer

O$_2$

Question 10

Which of the following best describes the role of ATP in energetic coupling during metabolism?

Accepted Answer

ATP hydrolysis provides energy to drive endergonic reactions by transferring a phosphate group.

Question 11

A cell is exposed to a competitive inhibitor of an enzyme involved in glycolysis. What is the most likely effect on the enzyme's activity?

Accepted Answer

The enzyme's activity will decrease because the inhibitor competes with the substrate for the active site.

Question 12

Which of the following statements correctly compares prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have compartmentalized organelles, increasing their complexity and functionality compared to prokaryotic cells.

Question 13

Which of the following would most likely increase the rate of an enzyme-catalyzed reaction, assuming substrate concentration is not limiting?

Accepted Answer

Increasing the temperature to the enzyme's optimal range.

Question 14

Which of the following is true regarding the movement of glucose across a membrane containing the GLUT-1 carrier protein?

Accepted Answer

Glucose moves down its concentration gradient via facilitated diffusion.

Question 15

Which of the following best describes the process of chemiosmosis in cellular respiration?

Accepted Answer

Protons flow down their electrochemical gradient through ATP synthase, driving the synthesis of ATP.

Question 16

Which equation best represents the change in free energy for a chemical reaction?

Accepted Answer

$\Delta G = G_{products} - G_{reactants}$

Question 17

A patient is exposed to cyanide, which inhibits cytochrome c oxidase in the electron transport chain. What is the most immediate cellular consequence?

Accepted Answer

Electron flow through the electron transport chain will stop, halting ATP synthesis by oxidative phosphorylation.

Question 18

Which of the following is a correct description of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway inhibits an enzyme earlier in the pathway, preventing overproduction.

Question 19

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Glucose is oxidized and oxygen is reduced, resulting in the production of ATP.

Cell Membranes, Transport, and Cellular Respiration: Study Guide for General Biology

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