Núcleo Flashcards
What is the nucleus?
The nucleus is a membrane-bound organelle that contains the cell’s genetic material.
True or False: The nucleus is only found in prokaryotic cells.
False
What is the primary function of the nucleus?
The primary function of the nucleus is to store and protect the cell’s DNA.
Fill in the blank: The nucleus is surrounded by a __________.
nuclear envelope
What is the composition of the nuclear envelope?
The nuclear envelope is composed of two lipid bilayers.
Multiple Choice: Which of the following is NOT a component of the nucleus? A) Nucleoplasm B) Nucleolus C) Ribosomes D) Chromatin
C) Ribosomes
What is chromatin?
Chromatin is a complex of DNA and proteins found in the nucleus.
True or False: The nucleolus is responsible for ribosome production.
True
What role does the nuclear pore complex play?
The nuclear pore complex regulates the transport of molecules between the nucleus and the cytoplasm.
Fill in the blank: The __________ is the site of RNA synthesis.
nucleus
What is the function of the nuclear lamina?
The nuclear lamina provides structural support to the nucleus and helps organize chromatin.
Multiple Choice: What is the main type of RNA synthesized in the nucleus? A) mRNA B) tRNA C) rRNA D) All of the above
D) All of the above
What happens during DNA replication?
DNA replication is the process of copying the cell’s DNA before cell division.
True or False: The nucleus is involved in protein synthesis.
False
Fill in the blank: The __________ serves as a site for ribosome assembly.
nucleolus
What is the function of nuclear transport receptors?
Nuclear transport receptors facilitate the movement of proteins and RNA in and out of the nucleus.
Multiple Choice: Which structure regulates transport in and out of the nucleus? A) Nuclear envelope B) Nucleolus C) Chromatin D) Ribosomes
A) Nuclear envelope
What is the significance of the nuclear pore diameter?
The nuclear pore diameter determines the size of molecules that can passively diffuse into and out of the nucleus.
True or False: The nucleoplasm is similar to cytoplasm.
True
What are nuclear localization signals?
Nuclear localization signals are sequences that tag proteins for import into the nucleus.
Fill in the blank: The __________ is a dense region within the nucleus where ribosomal RNA is synthesized.
nucleolus
What is the primary role of the nuclear envelope?
The primary role of the nuclear envelope is to protect the nucleus and regulate the exchange of materials.
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
B) Small ions
What is the role of histones in the nucleus?
Histones are proteins that help package and organize DNA into chromatin.
True or False: The number of nucleoli can vary depending on the cell type.
True
Fill in the blank: __________ are the structural units of chromatin.
Nucleosomes
What is the function of RNA polymerase in the nucleus?
RNA polymerase synthesizes RNA from a DNA template during transcription.
Multiple Choice: Which phase of the cell cycle involves the replication of DNA in the nucleus? A) G1 B) S C) G2 D) M
B) S
What is the importance of the nuclear envelope during cell division?
The nuclear envelope disassembles and reassembles to allow for chromosome segregation during cell division.
True or False: The nucleoplasm contains enzymes and nucleotides.
True
Fill in the blank: The __________ is the region of the nucleus that is rich in RNA and ribosomal proteins.
nucleolus
What is the primary purpose of the nuclear pore complex?
To control the movement of substances between the nucleus and the cytoplasm.
Multiple Choice: What is the main function of the nuclear lamina? A) DNA replication B) Structural support C) Gene expression D) Protein synthesis
B) Structural support
What is the function of mRNA in the nucleus?
mRNA carries genetic information from the DNA to the ribosomes for protein synthesis.
True or False: Chromatin is only found in the nucleus of eukaryotic cells.
True
Fill in the blank: The __________ aids in the organization of genetic material within the nucleus.
nuclear lamina
What is the role of exportins?
Exportins are proteins that facilitate the transport of RNA and proteins out of the nucleus.
Multiple Choice: Which of the following is a function of the nucleolus? A) DNA replication B) RNA synthesis C) Protein synthesis D) Lipid metabolism
B) RNA synthesis
What is the composition of nucleoplasm?
Nucleoplasm is composed of water, dissolved ions, and molecules such as nucleotides and enzymes.
True or False: The nuclear envelope is continuous with the endoplasmic reticulum.
True
Fill in the blank: The __________ contains the genetic blueprint of an organism.
DNA
What is the significance of the nuclear envelope in gene regulation?
The nuclear envelope helps compartmentalize transcription and translation processes, impacting gene expression.
