Question 1

Which of the following best describes the role of the ribosome during protein synthesis?

Accepted Answer

It translates mRNA codons into a polypeptide chain by linking amino acids together.

Question 2

A mutation changes the DNA sequence from ATG to ATA in the coding region of a gene. What is the most likely consequence for the resulting protein?

Accepted Answer

The protein may have a different amino acid at that position, potentially altering its function.

Question 3

Which of the following is TRUE regarding the plasma membrane?

Accepted Answer

It is selectively permeable, allowing some substances to cross while blocking others.

Question 4

During translation, which molecule brings the correct amino acid to the ribosome based on the mRNA codon?

Accepted Answer

tRNA

Question 5

Which organelle is responsible for producing ATP through oxidative phosphorylation?

Accepted Answer

Mitochondrion

Question 6

A cell is placed in a hypotonic solution. What will happen to the cell?

Accepted Answer

It will swell as water enters the cell.

Question 7

Which of the following best explains why the plasma membrane is described as a 'fluid mosaic'?

Accepted Answer

Proteins and lipids can move laterally within the membrane, creating a dynamic structure.

Question 8

Which process requires energy input from ATP to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 9

If a cell's sodium-potassium pump moves 3 Na$$^+$$ ions out and 2 K$$^+$$ ions in per ATP hydrolyzed, what is the net effect on membrane potential?

Accepted Answer

The inside of the cell becomes more negative.

Question 10

Which of the following statements about transcription is correct?

Accepted Answer

Transcription is the process of copying DNA into mRNA using RNA polymerase.

Question 11

A patient has a genetic disorder that prevents the formation of lysosomal enzymes. Which cellular process will be most affected?

Accepted Answer

Intracellular digestion of macromolecules

Question 12

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of polar solutes across the membrane via specific transport proteins, without energy input.

Question 13

Which organelle modifies, sorts, and packages proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 14

During translation, what is the function of the A site on the ribosome?

Accepted Answer

It accepts incoming tRNA carrying the next amino acid to be added.

Question 15

Which of the following equations correctly represents the movement of water across a semipermeable membrane due to osmosis?

Accepted Answer

$$H_2O$$ moves from an area of lower solute concentration to higher solute concentration.

Question 16

Which statement best describes the function of peroxisomes?

Accepted Answer

They break down fatty acids and detoxify harmful substances by generating hydrogen peroxide.

Question 17

A cell is actively secreting insulin into the bloodstream. Which process is responsible for releasing insulin from the cell?

Accepted Answer

Exocytosis

Question 18

Which of the following is a correct sequence of events in protein synthesis?

Accepted Answer

Transcription -\u003e Translation -\u003e Protein folding

Question 19

Which of the following best explains why the inside of the plasma membrane is negatively charged compared to the outside?

Accepted Answer

The sodium-potassium pump moves more Na$$^+$$ ions out than K$$^+$$ ions in, creating a net negative charge inside.

Question 20

Which of the following statements about the endoplasmic reticulum (ER) is correct?

Accepted Answer

Rough ER is studded with ribosomes and is involved in protein synthesis.

Protein Synthesis, The Cell, and Cytoplasmic Organelles: Core Concepts in Anatomy & Physiology

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