Question 1

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

Accepted Answer

ATP provides immediate energy for cellular work by releasing energy when its phosphate bonds are broken.

Question 2

What is the balanced chemical equation for 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 3

Which stage of cellular respiration produces the most ATP?

Accepted Answer

Electron Transport Chain (ETC)

Question 4

In the context of cellular respiration, what is the primary function of NADH and FADH$$_2$$?

Accepted Answer

They serve as electron carriers, transporting electrons to the electron transport chain.

Question 5

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+ in $$the absence of oxygen.

Question 6

Which of the following is a product of lactic acid fermentation in human muscle cells?

Accepted Answer

Lactic acid

Question 7

What is the balanced chemical equation for photosynthesis?

Accepted Answer

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

Question 8

During the light reactions of photosynthesis, what is the fate of the oxygen atoms from water molecules?

Accepted Answer

They are released as O$$_2$$ gas.

Question 9

Which structure inside the chloroplast contains the photosynthetic pigments and is the site of the light reactions?

Accepted Answer

Thylakoid membrane

Question 10

What is the main purpose of the Calvin Cycle in photosynthesis?

Accepted Answer

To fix carbon dioxide and produce sugar (G3P)

Question 11

Which of the following best explains the 10% rule in energy flow through ecosystems?

Accepted Answer

Only 10% of the energy at one trophic level is transferred to the next level; the rest is lost as heat.

Question 12

Which of the following is a correct comparison between autotrophs and heterotrophs?

Accepted Answer

Autotrophs use sunlight or inorganic chemicals to produce food, while heterotrophs obtain energy by eating other organisms.

Question 13

Which of the following is an example of a density-independent limiting factor?

Accepted Answer

Flood

Question 14

How does the First Law of Thermodynamics relate to photosynthesis?

Accepted Answer

Energy is transformed from light energy to chemical energy, but the total amount of energy remains constant.

Question 15

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which one substance is oxidized (loses electrons) and another is reduced (gains electrons).

Question 16

Which of the following best explains why plants cannot produce O$$_2$$ without light?

Accepted Answer

The splitting of water to release O$$_2$$ occurs during the light reactions, which require light energy.

Question 17

Which of the following is a product of the light reactions of photosynthesis?

Accepted Answer

NADPH

Question 18

Which of the following best describes the difference between a food chain and a food web?

Accepted Answer

A food chain shows a single pathway of energy flow, while a food web shows multiple interconnected pathways.

Question 19

Which of the following is an example of a biotic factor in an ecosystem?

Accepted Answer

Predators

Question 20

Which of the following best explains the relationship between limiting factors and carrying capacity?

Accepted Answer

Limiting factors determine the maximum population size (carrying capacity) that an environment can support.

Energy Flow, ATP, Cellular Respiration, Photosynthesis, and Ecosystem Dynamics Study Guide

Study Guide - Practice Questions