Question 1

Which structure in a eukaryotic cell is primarily responsible for housing most of the cell's genetic material?

Accepted Answer

Nucleus

Question 2

What is the main function of ribosomes in eukaryotic cells?

Accepted Answer

Translating genetic instructions from mRNA to produce proteins

Question 3

The nuclear envelope is described as a double membrane. What is the approximate space between its two membranes?

Accepted Answer

$$20-40\ nm$$

Question 4

Which of the following best describes the role of nuclear pores in the nuclear envelope?

Accepted Answer

They regulate the entry and exit of proteins and RNAs

Question 5

A cell is observed to have a large number of ribosomes bound to its endoplasmic reticulum. What can you infer about this cell's function?

Accepted Answer

It is likely involved in extensive protein synthesis, such as a digestive enzyme-producing cell

Question 6

Which of the following is NOT a function of the nucleolus?

Accepted Answer

Storing chromosomes

Question 7

If a mutation disrupts the nuclear lamina, which of the following cellular processes would be most directly affected?

Accepted Answer

Mechanical support and shape maintenance of the nucleus

Question 8

Which of the following best explains why the nuclear envelope is perforated by pores?

Accepted Answer

To regulate the movement of molecules such as RNA and proteins between the nucleus and cytoplasm

Question 9

A scientist isolates a cell and finds that it contains a nucleolus, nuclear envelope, and chromatin. Which type of cell is this most likely to be?

Accepted Answer

A eukaryotic cell

Question 10

Which of the following statements about chromosomes in eukaryotic cells is correct?

Accepted Answer

Each chromosome consists of a single DNA molecule associated with proteins

Question 11

During protein synthesis, which sequence of events correctly describes the flow of genetic information?

Accepted Answer

DNA → mRNA → protein

Question 12

If a cell's nuclear envelope is damaged and loses its selective permeability, which of the following is a likely consequence?

Accepted Answer

Uncontrolled exchange of molecules between the nucleus and cytoplasm

Question 13

Which of the following structures is directly involved in the mechanical support of the nucleus?

Accepted Answer

Nuclear lamina

Question 14

A mutation prevents the formation of messenger RNA (mRNA) in a cell. Which process would be most directly affected?

Accepted Answer

Protein synthesis by ribosomes

Question 15

Which equation best represents the central dogma of molecular biology as it relates to the nucleus and ribosomes?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 16

Cells with high rates of protein synthesis typically have which of the following features?

Accepted Answer

A large number of ribosomes

Question 17

Which of the following statements about ribosomes is TRUE?

Accepted Answer

Ribosomes are composed of ribosomal RNA and protein

Question 18

If a cell's ribosomes are inhibited by a toxin, which cellular process will be most directly affected?

Accepted Answer

Translation of mRNA into proteins

Question 19

Which of the following best describes chromatin?

Accepted Answer

A complex of DNA and proteins that makes up chromosomes

Question 20

A pancreatic cell is observed to have many ribosomes. What is the most likely reason for this observation?

Accepted Answer

It produces large amounts of digestive enzymes, which are proteins

The Eukaryotic Cell: Genetic Instructions, the Nucleus, and Ribosomes

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