Q: Which of the following equations correctly represents the hydrolysis of ATP, the main energy currency in cells?

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy} $$

Question 1

Which of the following best describes the Central Dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 2

A scientist discovers a new organism whose cells contain DNA in a nucleus, mitochondria, and ribosomes. Which of the following statements is most accurate about this organism?

Accepted Answer

It is a eukaryote because it has a nucleus and membrane-bound organelles.

Question 3

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Sorting and modifying proteins for secretion or delivery to other organelles.

Question 4

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides to the 3' end?

Accepted Answer

DNA polymerase

Question 5

Which of the following best explains why telomerase is important for chromosome stability in eukaryotic cells?

Accepted Answer

It extends the ends of chromosomes, preventing loss of genetic information during replication.

Question 6

A mutation causes a cell to produce a defective histone protein. Which process would be most directly affected?

Accepted Answer

Packaging of DNA into chromatin within the nucleus.

Question 7

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

Accepted Answer

The two strands are antiparallel and held together by hydrogen bonds between complementary bases.

Question 8

Which of the following equations correctly represents the hydrolysis of ATP, the main energy currency in cells?

Accepted Answer

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy} $$

Question 9

A cell is observed to have a high number of mitochondria. Which of the following is the most likely explanation for this observation?

Accepted Answer

The cell has a high energy demand and requires more ATP.

Question 10

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It brings the correct amino acid to the ribosome by matching its anticodon to the mRNA codon.

Question 11

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 12

A mutation in the gene encoding for a nuclear pore complex protein would most likely affect which cellular process?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm.

Question 13

Which of the following statements about RNA is correct?

Accepted Answer

RNA contains uracil instead of thymine.

Question 14

Which of the following best explains the function of exons and introns in eukaryotic genes?

Accepted Answer

Exons code for proteins, while introns are non-coding sequences that are removed during RNA processing.

Question 15

Which of the following best describes the process of alternative splicing?

Accepted Answer

It allows a single gene to produce multiple protein variants by including or excluding certain exons.

Question 16

Which of the following is true regarding the directionality of DNA synthesis?

Accepted Answer

DNA is synthesized in the 5' to 3' direction.

Question 17

A patient is diagnosed with a genetic disorder caused by a mutation in the gene encoding for a lysosomal enzyme. Which cellular process is most likely impaired?

Accepted Answer

Degradation of macromolecules within the cell.

Question 18

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

Accepted Answer

They are the site of protein synthesis, translating mRNA into polypeptides.

Question 19

Which of the following best explains why DNA replication is considered 'semi-conservative'?

Accepted Answer

Each new DNA molecule consists of one old (parental) strand and one newly synthesized strand.

Question 20

Which of the following equations correctly represents the base pairing in DNA?

Accepted Answer

$$ 	ext{A} = 	ext{T} $$ and $$ 	ext{G} = 	ext{C} $$

Cell Biology Fundamentals: Cell Structure, DNA, and Gene Expression

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