Question 1

Which of the following best explains why spaced practice is more effective for long-term learning than massed practice (cramming)?

Accepted Answer

Spaced practice provides repeated retrieval opportunities over time, strengthening memory consolidation and understanding.

Question 2

During cellular respiration, which of the following is the correct sequence of events for the flow of electrons from glucose to oxygen?

Accepted Answer

Glucose $$\rightarrow$$ Pyruvate $$\rightarrow$$ $$NADH/FADH_2$$ $$\rightarrow$$ Electron Transport Chain $$\rightarrow$$ Oxygen

Question 3

A poison such as cyanide inhibits Complex IV of the mitochondrial electron transport chain. What is the most immediate effect on cellular respiration?

Accepted Answer

NADH and FADH$$_2$$ will accumulate because electrons cannot be transferred to oxygen.

Question 4

Which of the following best describes the role of the proton motive force (PMF) in oxidative phosphorylation?

Accepted Answer

PMF is the energy stored in the concentration and electrical gradient of $$\mathrm{H^+}$$ across the inner mitochondrial membrane, which drives ATP synthesis via ATP synthase.

Question 5

If a cell's inner mitochondrial membrane becomes leaky to protons (e.g., due to dinitrophenol), what is the most likely consequence?

Accepted Answer

The proton gradient will dissipate, resulting in decreased ATP synthesis by ATP synthase.

Question 6

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+$$, allowing glycolysis to continue in the absence of oxygen.

Question 7

In photosynthesis, what is the primary function of the light-dependent reactions?

Accepted Answer

To generate ATP and NADPH needed for the Calvin cycle.

Question 8

Which of the following best explains why chlorophyll appears green to our eyes?

Accepted Answer

Chlorophyll reflects green light and absorbs red and blue wavelengths.

Question 9

What is the main reason that the absorption spectrum of chlorophyll a differs from that of chlorophyll b?

Accepted Answer

Slight variations in their molecular structure alter the wavelengths of light they absorb best.

Question 10

During the light reactions of photosynthesis, what is the immediate fate of the high-energy electron excited in the reaction center of Photosystem II?

Accepted Answer

It is transferred to the primary electron acceptor (pheophytin) and then enters the electron transport chain.

Question 11

Which of the following equations correctly represents the reduction of NADP$$^+$$ during the light reactions of photosynthesis?

Accepted Answer

$$\mathrm{NADP^+} + 2e^- + 2H^+ \rightarrow \mathrm{NADPH} + H^+$$

Question 12

What is the main outcome of the cyclic electron flow around Photosystem I in photosynthesis?

Accepted Answer

Production of ATP only, without NADPH or oxygen.

Question 13

Which of the following best describes the role of RuBisCO in the Calvin cycle?

Accepted Answer

RuBisCO catalyzes the fixation of CO$$_2 to $$ribulose-1,5-bisphosphate (RuBP).

Question 14

Which of the following statements correctly compares the electron transport chains (ETC) in cellular respiration and photosynthesis?

Accepted Answer

The ETC in respiration is located in the inner mitochondrial membrane, while in photosynthesis it is in the thylakoid membrane.

Question 15

A student is studying for a biology exam. According to evidence-based learning strategies, which combination would most likely result in the best long-term retention?

Accepted Answer

Spaced practice, interleaving topics, and frequent retrieval practice.

Question 16

If a plant is exposed only to green light, what would be the expected effect on its rate of photosynthesis, and why?

Accepted Answer

The rate would decrease because green light is mostly reflected, not absorbed, by chlorophyll.

Question 17

Which of the following best describes the relationship between wavelength and energy of light, as it pertains to photosynthesis?

Accepted Answer

Shorter wavelengths have higher energy and are absorbed more efficiently by chlorophyll.

Question 18

During glycolysis, if a cell lacks a mechanism to regenerate NAD$$^+$$, what will be the result?

Accepted Answer

Glycolysis will slow down or stop due to accumulation of NADH and depletion of NAD$$^+.$$

Question 19

Which of the following is a real-world application of the importance of the oxygen produced during oxygenic photosynthesis?

Accepted Answer

Oxygen produced is used as the final electron acceptor in aerobic respiration, supporting complex multicellular life.

Evidence-Based Learning Strategies for General Biology

Guida di studio - Domande di pratica

Study guide - Flashcard