Question 1

Which of the following best explains why water has a high specific heat compared to most other substances?

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form.

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. What is the independent variable in this experiment?

Accepted Answer

The presence or absence of the fertilizer

Question 3

Which of the following statements about carbon is correct and helps explain its central role in the chemistry of life?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms.

Question 4

A patient is diagnosed with sickle cell disease. Which change at the molecular level is responsible for this condition?

Accepted Answer

A substitution of a single amino acid in the primary structure of hemoglobin.

Question 5

Which of the following best describes the difference between a hypothesis and a scientific theory?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-supported explanation that unifies a broad range of observations.

Question 6

Which of the following is a property of water that allows insects to walk on its surface?

Accepted Answer

Surface tension due to hydrogen bonding

Question 7

Which of the following best illustrates negative feedback regulation in biological systems?

Accepted Answer

When blood glucose rises, the pancreas secretes insulin, causing cells to take up glucose and lowering blood glucose levels.

Question 8

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains the base thymine, while RNA contains uracil instead of thymine.

Question 9

Which of the following best describes the role of mitochondria in eukaryotic cells?

Accepted Answer

They are the site of cellular respiration, converting chemical energy in glucose to ATP.

Question 10

A molecule of glucose ($$C_6H_{12}O_6$) is broken down into two molecules of pyruvate during glycolysis. This process is an example of which type of reaction?

Accepted Answer

Hydrolysis

Question 11

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 12

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds keep water molecules farther apart in ice, making it less dense than liquid water.

Question 13

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion or delivery to other organelles.

Question 14

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, while unsaturated fatty acids have one or more double bonds.

Question 15

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 16

A buffer solution is important in biological systems because it:

Accepted Answer

Minimizes changes in pH when acids or bases are added.

Question 17

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

They synthesize proteins by linking amino acids together.

Question 18

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya includes all eukaryotic organisms.

Question 19

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 20

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be released to power cellular work when the bonds are broken.

BIO 101 Exam 1 Study Guide: Chapters 1-6 (Themes of Biology, Chemistry of Life, Water, Carbon, Macromolecules, Cells)

Study Guide - Practice Questions

Study Guide - Flashcards