Question 1

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

Accepted Answer

Eukaryotic cells have their genetic material enclosed within a nucleus, whereas prokaryotic cells do not.

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. Which part of the scientific method is represented by the group that does not receive fertilizer?

Accepted Answer

Control group

Question 3

Which of the following equations correctly represents the process of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 4

Which of the following best explains why enzymes are essential for cellular metabolism?

Accepted Answer

They lower the activation energy, allowing reactions to occur more rapidly at cellular temperatures.

Question 5

A patient is diagnosed with a genetic disorder caused by a single nucleotide substitution in a gene. Which type of mutation is most likely responsible?

Accepted Answer

Point mutation

Question 6

Which of the following statements about mitosis is correct?

Accepted Answer

Mitosis is used for growth, repair, and asexual reproduction in multicellular organisms.

Question 7

Which of the following best describes the role of the plasma membrane in cellular transport?

Accepted Answer

It acts as a selectively permeable barrier, regulating the movement of substances.

Question 8

A student observes that when a plant cell is placed in a hypertonic solution, the cell membrane pulls away from the cell wall. What is this process called?

Accepted Answer

Plasmolysis

Question 9

Which of the following is a correct comparison between DNA replication and transcription?

Accepted Answer

DNA replication produces DNA, while transcription produces RNA.

Question 10

Which of the following best explains how meiosis contributes to genetic variation?

Accepted Answer

By allowing crossing over and independent assortment of chromosomes

Question 11

Which of the following is a unifying characteristic of all living organisms?

Accepted Answer

Composed of one or more cells

Question 12

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

They are the site of protein synthesis.

Question 13

A scientist discovers a new molecule that is hydrophobic and contains long chains of carbon and hydrogen. To which class of biomacromolecules does this molecule most likely belong?

Accepted Answer

Lipids

Question 14

Which of the following equations correctly represents aerobic cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 15

Which of the following best describes the role of natural selection in evolution?

Accepted Answer

It increases the frequency of traits that enhance survival and reproduction.

Question 16

A patient is found to have a tumor caused by uncontrolled cell division. Which part of the cell cycle is most likely malfunctioning?

Accepted Answer

Cell cycle checkpoints

Question 17

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, creating partial charges.

Question 18

Which of the following is a correct statement about the process of protein synthesis?

Accepted Answer

Transcription produces mRNA from a DNA template, and translation uses mRNA to assemble amino acids into a protein.

Question 19

Which of the following best describes the function of the digestive system?

Accepted Answer

To break down food into molecules that can be absorbed and used by the body

Question 20

A genetic cross between two heterozygous pea plants (Yy x Yy) for seed color results in a 3:1 ratio of yellow to green seeds. Which principle of inheritance does this illustrate?

Accepted Answer

Law of Segregation

BIOL-15 Biosciences Syllabus and Course Structure – Yuba College Summer 2026

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