Question 1

Which of the following statements best describes why water has a high specific heat, and why this property is important for living organisms?

Accepted Answer

Water's high specific heat is due to the hydrogen bonds between water molecules, which require more energy to break. This helps organisms maintain stable internal temperatures despite fluctuations in environmental temperature.

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one group receives the fertilizer, and the other does not. All other conditions are kept the same. Which of the following correctly identifies the experimental design components?

Accepted Answer

The group receiving the fertilizer is the experimental group, the group not receiving fertilizer is the control group, the fertilizer is the independent variable, and plant growth is the dependent variable.

Question 3

Which of the following best explains why carbon is considered the backbone of life?

Accepted Answer

Carbon can form four covalent bonds, allowing it to create a variety of stable structures such as chains, rings, and branched molecules, which serve as the framework for organic molecules.

Question 4

A solution has a hydrogen ion concentration of $[H^+] = 1 	imes 10^{-5} \ \mathrm{M}$. What is the pH of this solution, and is it acidic, basic, or neutral?

Accepted Answer

pH = 5; the solution is acidic.

Question 5

Which of the following is an example of dehydration synthesis?

Accepted Answer

The formation of a disaccharide from two monosaccharides with the release of a water molecule.

Question 6

Which functional group is present in all amino acids and is responsible for their basic properties?

Accepted Answer

Amino group $(-NH_2)$

Question 7

A molecule of glucose ($C_6H_{12}O_6$) is combined with a molecule of fructose ($C_6H_{12}O_6$) to form sucrose. What is the molecular formula of sucrose?

Accepted Answer

$C_{12}H_{22}O_{11}$

Question 8

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, making them solid at room temperature; unsaturated fatty acids have one or more double bonds, making them liquid at room temperature.

Question 9

Which of the following is NOT a property of water that results from hydrogen bonding?

Accepted Answer

Water's ability to dissolve nonpolar substances.

Question 10

A DNA molecule contains 30% adenine (A). According to base-pairing rules, what percentage of guanine (G) would you expect to find?

Accepted Answer

20%

Question 11

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus and membrane-bound organelles, while eukaryotic cells have both.

Question 12

Which of the following is an example of a structural isomer?

Accepted Answer

Two molecules with the same molecular formula but different covalent arrangements of their atoms.

Question 13

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

Enzymes speed up chemical reactions by lowering the activation energy required for the reaction to proceed.

Question 14

A buffer solution is added to a beaker of acid. What is the primary function of the buffer in this scenario?

Accepted Answer

To minimize changes in pH by accepting or donating hydrogen ions as needed.

Question 15

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are long chains made up of repeating monomer units joined by covalent bonds.

Question 16

Which of the following is a correct statement about the structure of the phospholipid bilayer in cell membranes?

Accepted Answer

The bilayer consists of hydrophilic heads facing outward and hydrophobic tails facing inward.

Question 17

Which of the following best describes the process of hydrolysis?

Accepted Answer

The breaking of a polymer into monomers by the addition of a water molecule.

Question 18

Which of the following is a property of an acid in aqueous solution?

Accepted Answer

It increases the concentration of hydrogen ions $([H^+])$ in the solution.

Question 19

Which of the following best describes the role of genetic information in living organisms?

Accepted Answer

Genetic information, stored in DNA, provides instructions for building proteins and is passed from one generation to the next, connecting all living things through common ancestry.

Biology Exam 1 Study Guide: Foundations, Chemistry, Water, Carbon, and Macromolecules

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