Question 1

Which of the following best describes a scientific theory in biology?

Accepted Answer

A broad explanation supported by a large body of evidence and capable of generating new hypotheses.

Question 2

Which of the following is NOT considered one of the three domains of life?

Accepted Answer

Fungi

Question 3

A scientist is designing an experiment to test the effect of sunlight on plant growth. Which of the following is the independent variable?

Accepted Answer

Amount of sunlight

Question 4

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons determine the chemical bonding properties of an atom.

Question 5

Which chemical bond is formed when electrons are shared between atoms?

Accepted Answer

Covalent bond

Question 6

Given the following reaction: $$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$, which statement is true?

Accepted Answer

Glucose is being oxidized.

Question 7

Which property of water allows it to dissolve many substances, making it an excellent solvent?

Accepted Answer

Its polarity

Question 8

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a relatively constant pH by absorbing excess H$$^+ or OH$^-$$ ions.

Question 9

Which of the following best explains why carbon is so important in living systems?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable and complex molecules.

Question 10

Which of the following is an example of a hydrophobic molecule?

Accepted Answer

Cholesterol

Question 11

Which statement about chemical equilibrium is correct?

Accepted Answer

At equilibrium, the forward and reverse reaction rates are equal.

Question 12

Which of the following is a correct description of an enzyme?

Accepted Answer

An enzyme is a protein that acts as a biological catalyst.

Question 13

Which of the following is NOT a polymer?

Accepted Answer

Glucose

Question 14

Which of the following best describes the process of denaturation in proteins?

Accepted Answer

Loss of protein's three-dimensional structure due to environmental changes.

Question 15

Which of the following is a correct statement about isomers?

Accepted Answer

Isomers have the same molecular formula but different structures.

Question 16

Which of the following is a correct example of a dehydration reaction?

Accepted Answer

Joining two amino acids to form a peptide bond and releasing water.

Question 17

Which of the following is a correct statement about emergent properties?

Accepted Answer

Emergent properties arise from the arrangement and interaction of parts within a system.

Question 18

Which of the following best describes the function of the methyl group ($$-\mathrm{CH_3$}) in $$organic molecules?

Accepted Answer

It serves as an identification tag that can affect gene expression.

Question 19

Which of the following is true about the structure of amino acids?

Accepted Answer

Amino acids have an asymmetric (chiral) carbon atom.

Question 20

Which of the following best describes the difference between qualitative and quantitative data?

Accepted Answer

Qualitative data is descriptive, while quantitative data is numerical.

General Biology Exam 1: Comprehensive Study Guide

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