Question 1

Which of the following best describes the primary function of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and other molecules to produce ATP for cellular work

Question 2

During aerobic cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which of the following equations correctly summarizes the process of photosynthesis?

Accepted Answer

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

Question 4

Which coenzyme is reduced during the light reactions of photosynthesis and later oxidized in the Calvin cycle?

Accepted Answer

NADP$$^+$$

Question 5

In glycolysis, what is the net gain of ATP molecules produced per molecule of glucose?

Accepted Answer

2 ATP

Question 6

Which of the following best explains why fermentation is necessary in the absence of oxygen?

Accepted Answer

It allows glycolysis to continue by regenerating NAD$$^+$$ from NADH

Question 7

Which of the following statements about the electron transport chain (ETC) in mitochondria is correct?

Accepted Answer

The ETC creates a proton gradient across the inner mitochondrial membrane

Question 8

Which process in cellular respiration produces the majority of ATP?

Accepted Answer

Electron transport chain and chemiosmosis (oxidative phosphorylation)

Question 9

During which phase of the cell cycle is DNA replicated?

Accepted Answer

S phase

Question 10

Which of the following best describes the difference between mitosis and meiosis in animals?

Accepted Answer

Mitosis produces two diploid cells, while meiosis produces four haploid cells

Question 11

Which of the following events increases genetic diversity during meiosis?

Accepted Answer

Crossing over between homologous chromosomes during prophase I

Question 12

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 13

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the proton gradient to synthesize ATP from ADP and inorganic phosphate

Question 14

In the Calvin cycle, what is the process of carbon fixation?

Accepted Answer

The conversion of $$CO_2$$ into organic molecules such as glucose

Question 15

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry the same genes but may have different alleles

Question 16

Which of the following best explains why plants appear green to our eyes?

Accepted Answer

Chlorophyll reflects and transmits green wavelengths while absorbing red and blue

Question 17

Which of the following is a key difference between oxidative phosphorylation and substrate-level phosphorylation?

Accepted Answer

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

Question 18

Which of the following best describes the function of cyclin-dependent kinases (CDKs) in the cell cycle?

Accepted Answer

They phosphorylate target proteins to regulate progression through the cell cycle

Question 19

A patient is diagnosed with a tumor that has invaded surrounding tissues and spread to other organs. Which terms best describe this condition?

Accepted Answer

Malignant tumor; metastasis

Question 20

During which stage of meiosis do homologous chromosomes separate, and what is the ploidy of the resulting cells?

Accepted Answer

Anaphase I; haploid

Step-by-Step Study Guidance for Biology I Test 3 (Cellular Respiration, Photosynthesis, Cell Cycle, Meiosis)

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