Question 1

Which of the following best describes the molecular components of the plasma membrane in eukaryotic cells?

Accepted Answer

A double layer of phospholipids with embedded proteins, cholesterol, and carbohydrates.

Question 2

A red blood cell is placed in a hypotonic solution. Which process will primarily occur, and what is the likely outcome for the cell?

Accepted Answer

Osmosis; the cell will swell and may burst as water enters.

Question 3

Which of the following best explains why the sodium/potassium pump is considered an example of active transport?

Accepted Answer

It uses ATP to move sodium and potassium ions against their concentration gradients.

Question 4

Which of the following statements correctly compares mitosis and meiosis?

Accepted Answer

Mitosis results in diploid daughter cells, while meiosis results in haploid daughter cells.

Question 5

During which stage of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 6

How many chromosomes are present in a typical human somatic cell, and what type of chromosomes are they?

Accepted Answer

46 chromosomes, including autosomes and sex chromosomes

Question 7

Which of the following best distinguishes genotype from phenotype?

Accepted Answer

Genotype refers to the genetic makeup, while phenotype refers to the observable traits.

Question 8

In Mendel's monohybrid cross, if the parental (P) generation consists of true-breeding tall (TT) and short (tt) pea plants, what is the expected genotype ratio in the F2 generation?

Accepted Answer

$$1\ TT : 2\ Tt : 1\ tt$$

Question 9

Which of the following lists the three parts of a nucleotide?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 10

Which of the following is a key difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 11

How is DNA organized differently in prokaryotes compared to eukaryotes?

Accepted Answer

Prokaryotes have circular DNA in the cytoplasm; eukaryotes have linear chromosomes in a nucleus.

Question 12

Which of the following statements about transcription and translation is correct?

Accepted Answer

In eukaryotes, transcription occurs in the nucleus and translation occurs in the cytoplasm.

Question 13

Which enzyme is responsible for unwinding the DNA double helix during DNA replication?

Accepted Answer

Helicase

Question 14

Which eukaryotic RNA polymerase is primarily responsible for synthesizing messenger RNA (mRNA)?

Accepted Answer

RNA Polymerase II

Question 15

What is the function of the trp operon in bacteria?

Accepted Answer

To repress the synthesis of tryptophan when it is abundant.

Question 16

Which of the following best describes the difference between heterochromatin and euchromatin?

Accepted Answer

Heterochromatin is highly condensed and transcriptionally inactive; euchromatin is less condensed and active.

Question 17

Which sequence correctly lists the steps in the lytic cycle of a bacteriophage?

Accepted Answer

Attachment, penetration, biosynthesis, maturation, release

Question 18

A patient is given an intravenous solution that is isotonic to their blood plasma. Which process ensures that their red blood cells maintain normal shape and function?

Accepted Answer

Osmosis, with no net movement of water across the membrane

Question 19

A mutation causes a eukaryotic cell to lack functional DNA ligase. Which process would be most directly affected?

Accepted Answer

Joining of Okazaki fragments during DNA replication

Key Concepts in Cell Biology, Genetics, and Molecular Biology: Guided Study

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