Q: Which of the following is an example of a plasma membrane pump, and what is its main function?

Na\textsuperscript{+}/K\textsuperscript{+} ATPase; it maintains the electrochemical gradient by pumping 3 Na\textsuperscript{+} out and 2 K\textsuperscript{+} into the cell using ATP.

Question 1

Which of the following best describes the difference between primary and secondary active transport across the plasma membrane?

Accepted Answer

Primary active transport directly uses ATP to move substances against their concentration gradient, while secondary active transport uses the energy stored in an ion gradient created by primary active transport.

Question 2

Which of the following is an example of a plasma membrane pump, and what is its main function?

Accepted Answer

Na	extsuperscript{+}/K	extsuperscript{+} ATPase; it maintains the electrochemical gradient by pumping 3 Na	extsuperscript{+} out and 2 K	extsuperscript{+} into the cell using ATP.

Question 3

Which of the following best distinguishes between exocytosis and endocytosis?

Accepted Answer

Exocytosis moves substances out of the cell by vesicle fusion with the plasma membrane, while endocytosis brings substances into the cell by forming vesicles from the plasma membrane.

Question 4

A white blood cell engulfs a bacterium by surrounding it with its plasma membrane and forming a vesicle. Which process is this, and what is its specific name?

Accepted Answer

Endocytosis; phagocytosis

Question 5

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 6

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA is a double helix composed of two antiparallel strands held together by hydrogen bonds between complementary base pairs.

Question 7

Which of the following best defines the difference between transcription and translation?

Accepted Answer

Transcription is the synthesis of RNA from a DNA template, while translation is the synthesis of a polypeptide from an mRNA template.

Question 8

Which of the following correctly matches a type of RNA with its function?

Accepted Answer

tRNA: brings amino acids to the ribosome during translation

Question 9

During protein synthesis, which of the following best describes the role of the ribosome?

Accepted Answer

It facilitates the binding of tRNA anticodons to mRNA codons and catalyzes peptide bond formation between amino acids.

Question 10

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

Accepted Answer

They contain hydrolytic enzymes that break down waste materials and cellular debris.

Question 11

A mutation occurs in the promoter region of a gene. Which process is most likely to be directly affected?

Accepted Answer

The initiation of transcription by RNA polymerase

Question 12

Which phase of the somatic cell cycle is characterized by DNA replication?

Accepted Answer

S phase

Question 13

Which enzyme is primarily responsible for synthesizing new DNA strands during DNA replication, and what is its main function?

Accepted Answer

DNA polymerase; it adds nucleotides to the growing DNA strand using the template strand.

Question 14

Which of the following best describes the role of mitochondria in a eukaryotic cell?

Accepted Answer

They generate ATP through oxidative phosphorylation during cellular respiration.

Question 15

During mitosis, which event ensures that each daughter cell receives an identical set of chromosomes?

Accepted Answer

The separation of sister chromatids during anaphase

Question 16

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

Accepted Answer

They break down fatty acids and detoxify harmful substances using enzymes such as catalase.

Question 17

A cell is observed to have a high number of ribosomes. What is the most likely function of this cell?

Accepted Answer

Protein synthesis

Question 18

Which of the following best describes the difference between a symporter and an antiporter?

Accepted Answer

A symporter moves two substances in the same direction across the membrane, while an antiporter moves two substances in opposite directions.

Question 19

Which of the following is a correct sequence of events in the process of transcription and translation?

Accepted Answer

DNA is transcribed to mRNA in the nucleus, mRNA exits to the cytoplasm, and ribosomes translate mRNA into protein.

Question 20

Which of the following best describes the function of the nucleolus within the nucleus?

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.

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