Q: Which of the following equations correctly represents the summary reaction for aerobic cellular respiration?

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

Question 1

During cellular respiration, which of the following best describes the role of oxygen in the electron transport chain (ETS)?

Accepted Answer

Oxygen acts as the final electron acceptor, combining with electrons and protons to form water.

Question 2

A patient is diagnosed with lactic acidosis after intense exercise. Which process is primarily responsible for the accumulation of lactic acid in their muscles?

Accepted Answer

Anaerobic fermentation of pyruvate in the absence of sufficient oxygen.

Question 3

Which of the following equations correctly represents the summary reaction for aerobic cellular respiration?

Accepted Answer

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

Question 4

In the Krebs cycle, what is the fate of the carbon atoms from the original glucose molecule?

Accepted Answer

They are released as $$CO_2$$ during the cycle.

Question 5

Which molecule is produced as a result of glycolysis and enters the mitochondria for further breakdown in aerobic respiration?

Accepted Answer

Pyruvate ($$C_3H_4O_3)$$

Question 6

A genetic mutation causes a defect in ATP synthase. Which phase of cellular respiration would be most directly affected?

Accepted Answer

Electron Transport Chain (ETS)

Question 7

Which of the following best explains why cyanide poisoning is fatal at the cellular level?

Accepted Answer

Cyanide inhibits cytochrome c oxidase in the ETS, preventing ATP production.

Question 8

During photosynthesis, which molecule acts as the primary electron donor in Photosystem II?

Accepted Answer

Water ($$H_2O)$$

Question 9

Which of the following best describes the function of Rubisco in the Calvin Cycle?

Accepted Answer

It catalyzes the fixation of $$CO_2 to $$ribulose bisphosphate (RuBP).

Question 10

A plant is exposed to light only at night and kept in darkness during the day. Which photosynthetic pathway would allow it to fix carbon efficiently under these conditions?

Accepted Answer

CAM pathway

Question 11

Which of the following best explains why the stroma of the chloroplast is important for photosynthesis?

Accepted Answer

It is the site of the Calvin Cycle, where $$CO_2 is $$fixed into carbohydrates.

Question 12

In mitosis, what is the main purpose of the spindle fibers?

Accepted Answer

To attach to chromosomes and separate sister chromatids during anaphase.

Question 13

A cell with a diploid number of 8 undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

4

Question 14

Which of the following events occurs during prophase I of meiosis but not during mitosis?

Accepted Answer

Crossing over between homologous chromosomes.

Question 15

A patient is found to have a Philadelphia translocation. Which chromosomes are involved in this genetic abnormality?

Accepted Answer

Chromosomes 9 and 22

Question 16

Which of the following best describes the function of tumor suppressor genes?

Accepted Answer

They encode proteins that inhibit cell division and prevent tumor formation.

Question 17

Which of the following is a real-world example of a monosomy in humans?

Accepted Answer

Turner’s syndrome (45, X)

Question 18

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

Accepted Answer

M checkpoint (spindle checkpoint)

Question 19

A scientist is studying a cell that divides by binary fission. Which type of organism is this cell most likely from?

Accepted Answer

A prokaryote, such as a bacterium

Question 20

Which of the following best explains the difference between a chromatid and a chromosome during cell division?

Accepted Answer

A chromatid is one half of a duplicated chromosome, while a chromosome consists of two sister chromatids joined at the centromere.

General Biology Study Guide: Cellular Respiration, Photosynthesis, Mitosis, and Meiosis

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