Núcleo

Question 1

What is the nucleus?

Answer 1

The nucleus is a membrane-bound organelle that contains the cell’s genetic material.

Question 2

True or False: The nucleus is only found in prokaryotic cells.

Answer 2

False

Question 3

What is the primary function of the nucleus?

Answer 3

The primary function of the nucleus is to store and protect the cell’s DNA.

Question 4

Fill in the blank: The nucleus is surrounded by a __________.

Answer 4

nuclear envelope

Question 5

What is the composition of the nuclear envelope?

Answer 5

The nuclear envelope is composed of two lipid bilayers.

Question 6

Multiple Choice: Which of the following is NOT a component of the nucleus? A) Nucleoplasm B) Nucleolus C) Ribosomes D) Chromatin

Answer 6

C) Ribosomes

Question 7

What is chromatin?

Answer 7

Chromatin is a complex of DNA and proteins found in the nucleus.

Question 8

True or False: The nucleolus is responsible for ribosome production.

Answer 8

True

Question 9

What role does the nuclear pore complex play?

Answer 9

The nuclear pore complex regulates the transport of molecules between the nucleus and the cytoplasm.

Question 10

Fill in the blank: The __________ is the site of RNA synthesis.

Answer 10

nucleus

Question 11

What is the function of the nuclear lamina?

Answer 11

The nuclear lamina provides structural support to the nucleus and helps organize chromatin.

Question 12

Multiple Choice: What is the main type of RNA synthesized in the nucleus? A) mRNA B) tRNA C) rRNA D) All of the above

Answer 12

D) All of the above

Question 13

What happens during DNA replication?

Answer 13

DNA replication is the process of copying the cell’s DNA before cell division.

Question 14

True or False: The nucleus is involved in protein synthesis.

Answer 14

False

Question 15

Fill in the blank: The __________ serves as a site for ribosome assembly.

Answer 15

nucleolus

Question 16

What is the function of nuclear transport receptors?

Answer 16

Nuclear transport receptors facilitate the movement of proteins and RNA in and out of the nucleus.

Question 17

Multiple Choice: Which structure regulates transport in and out of the nucleus? A) Nuclear envelope B) Nucleolus C) Chromatin D) Ribosomes

Answer 17

A) Nuclear envelope

Question 18

What is the significance of the nuclear pore diameter?

Answer 18

The nuclear pore diameter determines the size of molecules that can passively diffuse into and out of the nucleus.

Question 19

True or False: The nucleoplasm is similar to cytoplasm.

Answer 19

True

Question 20

What are nuclear localization signals?

Answer 20

Nuclear localization signals are sequences that tag proteins for import into the nucleus.

Question 21

Fill in the blank: The __________ is a dense region within the nucleus where ribosomal RNA is synthesized.

Answer 21

nucleolus

Question 22

What is the primary role of the nuclear envelope?

Answer 22

The primary role of the nuclear envelope is to protect the nucleus and regulate the exchange of materials.

Question 23

Multiple Choice: What type of molecules can freely diffuse through nuclear pores? A) Large proteins B) Small ions C) DNA D) All of the above

Answer 23

B) Small ions

Question 24

What is the role of histones in the nucleus?

Answer 24

Histones are proteins that help package and organize DNA into chromatin.

Question 25

True or False: The number of nucleoli can vary depending on the cell type.

Answer 25

True

Question 26

Fill in the blank: __________ are the structural units of chromatin.

Answer 26

Nucleosomes

Question 27

What is the function of RNA polymerase in the nucleus?

Answer 27

RNA polymerase synthesizes RNA from a DNA template during transcription.

Question 28

Multiple Choice: Which phase of the cell cycle involves the replication of DNA in the nucleus? A) G1 B) S C) G2 D) M

Answer 28

B) S

Question 29

What is the importance of the nuclear envelope during cell division?

Answer 29

The nuclear envelope disassembles and reassembles to allow for chromosome segregation during cell division.

Question 30

True or False: The nucleoplasm contains enzymes and nucleotides.

Answer 30

True

Question 31

Fill in the blank: The __________ is the region of the nucleus that is rich in RNA and ribosomal proteins.

Answer 31

nucleolus

Question 32

What is the primary purpose of the nuclear pore complex?

Answer 32

To control the movement of substances between the nucleus and the cytoplasm.

Question 33

Multiple Choice: What is the main function of the nuclear lamina? A) DNA replication B) Structural support C) Gene expression D) Protein synthesis

Answer 33

B) Structural support

Question 34

What is the function of mRNA in the nucleus?

Answer 34

mRNA carries genetic information from the DNA to the ribosomes for protein synthesis.

Question 35

True or False: Chromatin is only found in the nucleus of eukaryotic cells.

Answer 35

True

Question 36

Fill in the blank: The __________ aids in the organization of genetic material within the nucleus.

Answer 36

nuclear lamina

Question 37

What is the role of exportins?

Answer 37

Exportins are proteins that facilitate the transport of RNA and proteins out of the nucleus.

Question 38

Multiple Choice: Which of the following is a function of the nucleolus? A) DNA replication B) RNA synthesis C) Protein synthesis D) Lipid metabolism

Answer 38

B) RNA synthesis

Question 39

What is the composition of nucleoplasm?

Answer 39

Nucleoplasm is composed of water, dissolved ions, and molecules such as nucleotides and enzymes.

Question 40

True or False: The nuclear envelope is continuous with the endoplasmic reticulum.

Answer 40

True

Question 41

Fill in the blank: The __________ contains the genetic blueprint of an organism.

Answer 41

DNA

Question 42

What is the significance of the nuclear envelope in gene regulation?

Answer 42

The nuclear envelope helps compartmentalize transcription and translation processes, impacting gene expression.