Q: Which of the following equations correctly represents the overall process of photosynthesis?

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

Question 1

Which of the following statements correctly describes the main difference between substrate-level phosphorylation and oxidative phosphorylation during cellular respiration?

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 to generate ATP.

Question 2

During glycolysis, which enzyme catalyzes the commitment step, and what is the significance of this step?

Accepted Answer

Phosphofructokinase (PFK); it is the rate-limiting enzyme and commits glucose to the glycolytic pathway.

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration, and what is the product formed?

Accepted Answer

Oxygen ($$O_2$$); water ($$H_2O) is $$formed.

Question 4

A muscle cell is deprived of oxygen but continues to contract. Which process is supplying ATP, and what is the main byproduct?

Accepted Answer

Lactic acid fermentation; lactate is the main byproduct.

Question 5

Which of the following best explains why fats yield more ATP per gram than carbohydrates during cellular respiration?

Accepted Answer

Fats have more C-H bonds, which provide more electrons for the electron transport chain.

Question 6

Which of the following is true regarding the regulation of cellular respiration by feedback inhibition?

Accepted Answer

ATP and citrate inhibit phosphofructokinase, while AMP stimulates it.

Question 7

Which of the following best describes the main difference between obligate anaerobes and facultative anaerobes?

Accepted Answer

Obligate anaerobes cannot survive in the presence of oxygen, while facultative anaerobes can use oxygen if it is available.

Question 8

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

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

Question 9

Which molecule is oxidized and which is reduced during photosynthesis?

Accepted Answer

Water ($$H_2O) is $$oxidized and carbon dioxide ($$CO_2) is $$reduced.

Question 10

Which of the following best describes the role of the light-harvesting complex in a photosystem?

Accepted Answer

It captures photons and transfers energy to the reaction center chlorophyll.

Question 11

A plant is exposed to light of only one wavelength. Which tool would you use to determine which wavelengths are most effective for photosynthesis, and what would you measure?

Accepted Answer

A spectrophotometer; measure the absorption of different wavelengths by chlorophyll.

Question 12

Which of the following is a key difference between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

In mitochondria, protons are pumped into the intermembrane space; in chloroplasts, protons are pumped into the thylakoid lumen.

Question 13

Which type of cell signaling involves the release of neurotransmitters across a synaptic gap?

Accepted Answer

Synaptic signaling

Question 14

Which of the following best describes the function of a G-protein coupled receptor (GPCR)?

Accepted Answer

It activates a G-protein by facilitating the exchange of GDP for GTP upon ligand binding.

Question 15

Which of the following second messengers is produced from ATP by the enzyme adenylyl cyclase?

Accepted Answer

cAMP (cyclic adenosine monophosphate)

Question 16

Which event occurs during anaphase of mitosis?

Accepted Answer

Sister chromatids are separated and pulled toward opposite poles.

Question 17

Which of the following best describes the difference between benign and malignant tumors?

Accepted Answer

Benign tumors do not invade surrounding tissues, while malignant tumors can invade and metastasize.

Question 18

Which of the following events increases genetic variability during meiosis?

Accepted Answer

Crossing over between homologous chromosomes during prophase I.

Question 19

A cell with 2n = 46 chromosomes undergoes meiosis. How many chromosomes will each gamete contain, and what is the significance of this number?

Accepted Answer

Each gamete will contain 23 chromosomes; this ensures that fertilization restores the diploid number.

Question 20

Which of the following best describes apoptosis?

Accepted Answer

A programmed cell death process that eliminates damaged or unnecessary cells.

Cellular Respiration, Photosynthesis, Cell Communication, and Cell Division: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards