quizzes

Question 1

Which statement BEST describes the functional role of the nucleus in eukaryotic cells?

Answer 1

It stores genetic information and coordinates gene expression

DNA is housed in the nucleus, and transcription/regulation occur there.

Question 2

Which of the following is NOT a function of the rough endoplasmic reticulum?

Answer 2

Detoxification of xenobiotics

Detoxification is a function of the smooth ER, not rough ER.

Question 3

Which of the following structures is NOT part of the endomembrane system?

Answer 3

Ribosome

Ribosomes are not membrane-bound organelles.

Question 4

Which of the following statements is NOT TRUE of the Golgi apparatus?

Answer 4

It is the primary site of protein synthesis

Protein synthesis occurs at ribosomes, not the Golgi.

Question 5

Which organelle plays a direct regulatory role in apoptosis?

Answer 5

Mitochondrion

Mitochondria release cytochrome c to trigger apoptosis.

Question 6

Which of the following molecules is NOT an example of a type of eukaryotic signal molecule?

Answer 6

Endotoxin

Endotoxins are bacterial components, not signaling molecules.

Question 7

Which process describes the movement of secretory vesicles OUT of the cell?

Answer 7

Exocytosis

Exocytosis exports materials outside the cell.

Question 8

Which statement BEST describes biotransformation?

Answer 8

The modification of hydrophobic compounds to facilitate excretion

Biotransformation increases solubility for removal from the body.

Question 9

Which sequence correctly represents the signal transduction mechanism used in cell signaling?

Answer 9

Reception → transduction → response → termination

Signals are detected, relayed, acted on, then shut off.

Question 10

Which statement BEST explains why ribosomes bound to rough ER and free ribosomes in the cytosol are structurally identical?

Answer 10

Protein destination is determined by signal sequences, not ribosome type

Ribosomes are identical; targeting depends on the protein signal.

Question 11

All of the following classes of compounds are lipids except _______.

Answer 11

Nucleotides

Nucleotides are building blocks of nucleic acids, not lipids.

Question 12

Which of the following amino acids contain a hydrophobic side chain?

Answer 12

Leucine

Leucine has a nonpolar hydrocarbon side chain.

Question 13

Which of the following small molecules do not form biopolymers?

Answer 13

C and D

Fatty acids and sugars do not form true biopolymers.

Question 14

Choose the amino acid that can function as a neurotransmitter.

Answer 14

Glutamic acid

Glutamate is a major excitatory neurotransmitter.

Question 15

Which of the following is not characteristic of an autopoietic system?

Answer 15

Intelligent

Autopoietic systems do not require intelligence.

Question 16

The assumption that a complete understanding of a living organism can be obtained solely by investigating all of its components is called _________.

Answer 16

Reductionism

Reductionism ignores interactions between components.

Question 17

Which of the following is not a core principle of systems biology?

Answer 17

Limit of resolution

It is a technical constraint, not a biological principle.

Question 18

The field of study associated with the investigation of gene expression patterns is called:

Answer 18

Functional genomics

It studies gene expression and function, not just sequences.

Question 19

The functional group present in the following molecule is called:

O
||
R—C—NH₂

Answer 19

Amide

A carbonyl linked to NH₂ defines an amide.

Question 20

The major function of carbohydrates is

Answer 20

Energy sources and structural elements

Carbohydrates provide energy and structural support (e.g., cellulose).