3.8 Multiple Choice Questions

Welcome to Unit 3 AP Biology Multiple Choice Questions! Grab some paper and a pencil 📄 to record your answers as you go. You can see how you did on the Unit 3 Practice Questions Answers and Review sheet once you're done. Don't worry, we have tons of resources available if you get stumped 😕 on a question. And if solo study is not your thing, join a group in Hours!

Not ready to take a quiz yet? Take a look at the Intro to Unit 3.

Facts about the test: The AP Biology exam has 60 multiple choice questions and you will be given 1 hour 30 minutes to complete the section. That means it should take you around 15 minutes to complete 10 questions.

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1. The building blocks of enzymes are:

A. Amino Acids

B. Monosaccharides

C. Nucleotides

D. Fatty Acids

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A. Sequence of hydrogen bonding

B. Sequence of nucleotides

C. Allosteric site

D. Active site

A. Sympatric site

B. Allopatric site

C. Allosteric site

D. Active site

A. 1-3

B. 6-7

C. 9-11

D. 13-14

A. The peptide bonds between amino acids break

B. The enzyme unfolds as secondary, tertiary, and quaternary structures become disrupted

C. The primary structure unravels

D. Only the quaternary structures separate

6. Students disagree on whether or not photosynthesis occurs in organisms other than plants. Choose the correct understanding of this:

A. Only plants can perform photosynthesis

B. Plants, fungi, and all protists can undergo photosynthesis

C. Plants and animals can both perform photosynthesis

D. Plants are NOT the only organism that can undergo photosynthesis. Photosynthetic bacteria like cyanobacteria were among the first organisms to harvest light energy to make organic molecules

A. Water

B. Oxygen

C. Carbon Dioxide

D. Sugar

A. ETC

B. Glycolysis

C. Aerobic cellular respiration

D. Krebs cycle

A. to regenerate ATP

B. to reduce NAD+ and FADH

C. to recycle NAD+ and FADH

D. to hydrolyze ATP

A. Krebs cycle

B. glycolysis and Krebs cycle

C. the citric acid cycle

D. the light reactions

A. mitochondrial matrix: thylakoid

B. stroma: mitochondrial matrix

C. thylakoid membrane: mitochondrial cristae

D. stomata: mitochondria

A. the matrix

B. the stroma

C. the thylakoid

D. the intermembrane space

A. Krebs cycle and ETC

B. ETC and chemiosmosis

C. Glycolysis and Krebs cycle

D. Glycolysis and Citric acid cycle

14. The fitness of an organism is directly related to

A. How well it can survive and reproduce in its environment

B. How well it can metabolize organic materials from the environment

C. How well it can adapt to fit it's environment

D. How well it can evade predators and hunt

A. It allows the ETC during the Calvin cycle to improve efficiency

B. it creates an environment of lower pH to establish the electrochemical gradient

C. different pigments produce beautiful colors in autumn

D. different pigments absorb varying wavelengths of light, giving plants a broader range for light absorption