Lesson Nucleus Flashcards
(24 cards)
What is the function of the nucleus in a cell?
The nucleus serves as the control center of the cell, housing the cell’s DNA and coordinating activities such as growth, metabolism, and reproduction.
True or False: The nucleus is found in prokaryotic cells.
False
Fill in the blank: The nucleus is surrounded by a double membrane known as the __________.
nuclear envelope
What is the role of nucleolus within the nucleus?
The nucleolus is responsible for the production of ribosomes.
What type of genetic material is contained in the nucleus?
DNA (deoxyribonucleic acid)
Multiple choice: Which of the following structures is NOT found in the nucleus? A) Chromatin B) Nucleoplasm C) Ribosomes D) Nucleolus
C) Ribosomes
What is chromatin?
Chromatin is a complex of DNA and proteins found in the nucleus that condenses to form chromosomes during cell division.
True or False: The nuclear envelope is permeable to all substances.
False
What are nuclear pores?
Nuclear pores are openings in the nuclear envelope that regulate the transport of molecules in and out of the nucleus.
Fill in the blank: The __________ is a dense region within the nucleus where ribosomal RNA is synthesized.
nucleolus
What happens to the nucleus during cell division?
The nucleus undergoes a process of division called mitosis, leading to the formation of two daughter nuclei.
Multiple choice: Which process occurs in the nucleus? A) Photosynthesis B) DNA replication C) Protein synthesis D) Cellular respiration
B) DNA replication
What is the significance of the nuclear envelope?
The nuclear envelope protects the DNA and separates the contents of the nucleus from the cytoplasm.
True or False: The nucleus contains all the genetic material required for the functioning of an organism.
True
What is the primary difference between eukaryotic and prokaryotic cells regarding the nucleus?
Eukaryotic cells have a defined nucleus, while prokaryotic cells do not have a true nucleus.
Fill in the blank: The __________ is a region of the nucleus where DNA is tightly packed into chromosomes.
chromatin
What is the primary function of the nuclear lamina?
The nuclear lamina provides structural support to the nucleus and helps organize chromatin.
Multiple choice: Which of the following is a component of the nuclear envelope? A) Lipid bilayer B) Cytoplasm C) Ribosomal RNA D) Mitochondria
A) Lipid bilayer
What role does the nucleus play in gene expression?
The nucleus regulates gene expression by controlling the transcription of DNA into RNA.
True or False: The nucleolus is involved in the synthesis of proteins.
False
What is a nuclear matrix?
The nuclear matrix is a network of fibers found throughout the nucleus that helps maintain its shape and organization.
Fill in the blank: During __________, the DNA in the nucleus is replicated.
interphase
What is the relationship between the nucleus and the endoplasmic reticulum?
The endoplasmic reticulum is connected to the nuclear envelope, allowing for communication and transport between the nucleus and the cytoplasm.
Multiple choice: What is the primary component of the nuclear envelope? A) RNA B) DNA C) Lipids D) Proteins
C) Lipids
