Question 1

Which of the following best describes the interconnected nature of organelles in the endomembrane system?

Accepted Answer

They exchange materials via vesicular transport, allowing coordinated functions such as protein modification and trafficking.

Question 2

A protein destined for secretion is synthesized in the cell. Which sequence of organelles does it pass through, starting from its synthesis?

Accepted Answer

Rough ER → Golgi apparatus → Secretory vesicle → Plasma membrane

Question 3

Which of the following is a primary function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Lipid synthesis and detoxification

Question 4

The Golgi apparatus is organized into cis and trans networks. What is the main difference between these two regions?

Accepted Answer

The cis network receives vesicles from the ER, while the trans network sorts and dispatches vesicles to their final destinations.

Question 5

Which of the following best describes anterograde transport in the secretory pathway?

Accepted Answer

Movement of vesicles from the ER to the Golgi apparatus and then to the plasma membrane

Question 6

Lysosomes play a critical role in cellular function. Which of the following best describes their primary function?

Accepted Answer

Degradation of macromolecules and recycling of cellular components

Question 7

Peroxisomes are unique among organelles. Which statement about their formation is correct?

Accepted Answer

They are formed by division of pre-existing peroxisomes and import of proteins directly from the cytosol.

Question 8

Which structural feature of DNA allows for ease of information transmission during replication?

Accepted Answer

The antiparallel double helix structure with complementary base pairing

Question 9

Which equation best represents the semiconservative model of DNA replication?

Accepted Answer

Each daughter DNA molecule consists of one parental strand and one newly synthesized strand: $$	ext{DNA}_{	ext{parent}} ightarrow 	ext{DNA}_{	ext{daughter}} = 	ext{strand}_{	ext{parent}} + 	ext{strand}_{	ext{new}}$$

Question 10

A DNA sequence is given as 5'-ATGCGT-3'. What is the corresponding mRNA sequence after transcription?

Accepted Answer

5'-AUGCGU-3'

Question 11

Which of the following best describes the function of histone acetylation in chromatin structure?

Accepted Answer

It decreases DNA packaging, making genes more accessible for transcription.

Question 12

Which experiment provided strong evidence that DNA is the carrier of genetic information in cells?

Accepted Answer

Avery, MacLeod, and McCarty's experiment showing that DNA from heat-killed bacteria could transform living bacteria.

Question 13

Given the DNA sequence 3'-TACGGA-5', use the genetic code to determine the corresponding polypeptide sequence.

Accepted Answer

Methionine-Glycine

Question 14

Which of the following is NOT a posttranscriptional processing event for mRNA?

Accepted Answer

Methylation of the ribose sugar

Question 15

Alternative splicing allows for:

Accepted Answer

Production of multiple protein variants from a single gene

Question 16

Which equation best represents the process of transcription?

Accepted Answer

$$	ext{DNA} \xrightarrow{	ext{RNA polymerase}} 	ext{mRNA}$$

Question 17

Which of the following is a major function of tRNA in protein synthesis?

Accepted Answer

Carrying amino acids to the ribosome and matching them to the mRNA codon

Question 18

Regulation of gene expression can occur at multiple steps. Which of the following is NOT a step where regulation commonly occurs?

Accepted Answer

DNA replication

Question 19

Transcription factors control gene expression by:

Accepted Answer

Binding to promoter regions and influencing the recruitment of RNA polymerase

Question 20

Why does post-translational modification of proteins affect their function?

Accepted Answer

It changes the protein's structure, which can alter its activity, localization, or stability.

Information Storage and Transfer: The Endomembrane System, Nucleus, and Genetic Information

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