Q: Which equation correctly represents the overall process of aerobic cellular respiration?

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + \text{energy}$$

Question 1

Which of the following best describes the difference between anabolic and catabolic pathways in cellular metabolism?

Accepted Answer

Anabolic pathways synthesize complex molecules from simpler ones, requiring energy; catabolic pathways break down complex molecules into simpler ones, releasing energy.

Question 2

Why is ATP considered the 'energy currency' of the cell, and what is the chemical reaction for its hydrolysis?

Accepted Answer

ATP stores energy in its phosphate bonds, and its hydrolysis is $$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 3

During glycolysis, which molecule acts as the final electron acceptor, and what is the net ATP gain per glucose molecule?

Accepted Answer

NAD+; 2 ATP

Question 4

Which statement best explains why enzymes lower the activation energy of a reaction?

Accepted Answer

Enzymes provide a surface for reactants to bind, stabilizing the transition state.

Question 5

In cellular respiration, what is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 6

Which of the following is true about the citric acid cycle (Krebs cycle)?

Accepted Answer

It produces ATP, NADH, and FADH$$_2 by $$oxidizing acetyl-CoA.

Question 7

Which equation correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 8

Which of the following best describes the role of stomata in plant leaves?

Accepted Answer

Stomata regulate gas exchange and water loss.

Question 9

What is the main difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs produce their own food using inorganic sources, while heterotrophs consume organic compounds.

Question 10

Which pigment is primarily responsible for absorbing light energy during photosynthesis, and what is its absorption spectrum?

Accepted Answer

Chlorophyll a; absorbs mainly blue and red wavelengths

Question 11

During the light reactions of photosynthesis, what is the role of water?

Accepted Answer

Water donates electrons to photosystem II, producing oxygen as a byproduct.

Question 12

Which enzyme is responsible for carbon fixation in the Calvin cycle, and how does it differ from PEP carboxylase?

Accepted Answer

Rubisco; it can fix both CO$$_2$$ and O$$_2$$, while PEP carboxylase only fixes CO$$_2$$

Question 13

Which of the following best describes signal transduction in cell communication?

Accepted Answer

It is the conversion of an extracellular signal into a specific cellular response through a series of molecular events.

Question 14

Which molecule acts as a second messenger in many signal transduction pathways, and what is its chemical formula?

Accepted Answer

cAMP; $$\mathrm{C}_{10}\mathrm{H}_{12}\mathrm{N}_5\mathrm{O}_6\mathrm{P}$$

Question 15

During the cell cycle, which phase is characterized by DNA replication, and what is the main event occurring?

Accepted Answer

S phase; DNA synthesis

Question 16

Which structure ensures proper chromosome separation during mitosis?

Accepted Answer

Centromere

Question 17

What is the main difference between binary fission in bacteria and mitosis in eukaryotic cells?

Accepted Answer

Binary fission is a simpler process without a nucleus, while mitosis involves a nucleus and multiple steps.

Question 18

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding to anaphase?

Accepted Answer

M checkpoint

General Biology Study Guide: Energy, Respiration, Photosynthesis, Cell Communication, and Cell Cycle

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