Question 1

Which of the following best describes the difference between positive and negative feedback in biological systems?

Accepted Answer

Positive feedback amplifies a process, while negative feedback reduces or counteracts it.

Question 2

A scientist observes that a certain plant grows faster when exposed to blue light compared to red light. She proposes that blue light increases the rate of photosynthesis. This proposal is best described as:

Accepted Answer

A hypothesis

Question 3

Which of the following is an example of quantitative data?

Accepted Answer

The plant grew 5 centimeters in one week.

Question 4

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

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 5

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

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 6

Which of the following elements makes up the largest percentage of living matter by mass?

Accepted Answer

Oxygen

Question 7

A neutral atom of carbon has an atomic number of 6 and an atomic mass of 12. How many neutrons does it have?

Accepted Answer

$$12 - 6 = 6$$

Question 8

Which of the following bonds is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 9

A solution is made by dissolving 58.44 grams of NaCl (molecular mass = 58.44 g/mol) in enough water to make 1 liter of solution. What is the molarity of the solution?

Accepted Answer

$$1\ 	ext{M}$$

Question 10

Which of the following best explains why phospholipids are important for cell membranes?

Accepted Answer

They form a bilayer with hydrophobic tails and hydrophilic heads, creating a selective barrier.

Question 11

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration.

Question 12

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They lower the activation energy, increasing the rate of reactions.

Question 13

During aerobic cellular respiration, which process produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 14

Where in the chloroplast does the Calvin cycle (dark reaction) occur?

Accepted Answer

Stroma

Question 15

Which of the following correctly matches the phase of mitosis with its main event?

Accepted Answer

Metaphase: Chromosomes align at the cell's equator.

Question 16

A diploid cell with 8 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete have?

Accepted Answer

$$\frac{8}{2} = 4$$

Question 17

In Mendel's experiments, what was the significance of using true-breeding pea plants?

Accepted Answer

They ensured that observed traits were due to genetic inheritance, not environmental variation.

Question 18

Which enzyme is responsible for synthesizing the new DNA strand during replication?

Accepted Answer

DNA polymerase

Question 19

A mutation changes a codon from UAU (tyrosine) to UAA (stop codon). What type of mutation is this?

Accepted Answer

Nonsense mutation

Question 20

Which of the following best explains why a virus can infect some species but not others?

Accepted Answer

The virus must bind to specific receptors on the host cell surface.

Comprehensive Biology Final Exam Review Notes

Study Guide - Practice Questions

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