Tag: nucleus

Questions Related to nucleus

Which of the following divides the intracellular space into two distinct compartments?

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Endoplasmic reticulum

  2. Cell membrane

  3. Plasma membrane

  4. None of the above

Show answer
Correct Option: A
Explanation:
The endoplasmic reticulum is a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the outer nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis. The endoplasmic reticulum divides the intracellular space into two distinct compartments, viz. luminal and extra-luminal.
So, the correct answer is 'Endoplasmic reticulum'.

Which of the following separates the nucleoplasm with the cytoplasm?

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Cell membrane

  2. Nuclear membrane

  3. Endoplasmic reticulum

  4. Golgi body

Show answer
Correct Option: B
Explanation:

Nuclear membrane is a double layered membrane, made up of lipid bilayer and proteins that separates the nucleus from the rest of the cell. The cytoplasm contains the most of the hydrolytic enzymes, which can affect the genetic material. The membrane protects the genetic material from different chemical reactions. It decides what to enter and exit from the nucleus by acting selectively permeable. It also provides structural support to the nucleus.

Nuclear pores are the passage through which movement of ...........(I) and ..........(II) molecules takes place between ...........(III) and ...........(IV).


Fill in the blanks (I - IV) by selecting the correct option.

I II III IV
(1) DNA RNA ER Cytoplasm
(2) RNA Protein Nucleus Cytoplasm
(3) DNA RNA Cytoplasm Nucleus
(4) Protein RNA Nucleus Nucleolus

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. (1)

  2. (2)

  3. (3)

  4. (4)

Show answer
Correct Option: B
Explanation:

Nuclear pores  are the passage through which movement of RNA and protein molecules takes place between nucleus and cytoplasm.

So, the correct option is '(2)'.

From the following, identify which is the living matter of the cell.

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Chloroplast

  2. Endoplasmic reticulum

  3. Protoplasm 

  4. Mitochondria

Show answer
Correct Option: C
Explanation:

  • The living matter of cell is protoplasm which is the colorless material composed of a mixture of small molecules such as ions, amino acid etc.

So the correct answer is 'protoplasm'.

The nucleus is separated from the cytoplasm by ...........which is absent in .......... and present only in ......... The words filling the blanks are respectively

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Cell wall.bacteria and Amoeba

  2. Cell membrane , animals and prokaryotes

  3. Nuclear membrane, prokaryotes and eukaryotes

  4. Plasma membrane, eukaryotes and prokaryotes

Show answer
Correct Option: C
Explanation:
  • The nucleus of a cell is separated from the cytoplasm by a double membrane known as the nuclear envelope.
  • Prokaryotes do not have genomic DNA that is concentrated and localized to a small area within the cell called nucleoid region, thus it is absent in them.
  • Whereas, a eukaryotic cell contains all the organelles and nucleus which is separated from the cytoplasm by the nuclear envelope.
  • The correct answer is OPTION C.

The thread like structure present in the nucleus are

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Nucleolus

  2. Genes

  3. Chromosomes

  4. Ribosomes

Show answer
Correct Option: C
Explanation:

The thread like structure present in the nucleus are called the chromosomes or the chromatin, when the degree of condensation is very less.

A. Nucleolus is the region on the chromosomes that codes for the ribosomal RNA. 
B. Genes are the segments of DNA that code for the proteins. These are located on the chromosomes.
C. The chromosomes are the thread like structures made up of DNA and proteins and are present in the DNA.
D. Ribosomes are the ribo-nucleoproteins present in the cytoplasm that take part in protein formation.
Hence, the correct answer is 'Chromosomes'

.......... could be found in both, the nucleus and the cytoplasm.

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Nucleolus

  2. Ribosomes

  3. RNA

  4. Both B and C

Show answer
Correct Option: C
Explanation:

  • RNA is found everywhere- nucleus, nucleolus, mitochondria, chloroplasts, ribosomes, cytoplasm, etc. RNAs are 3 different types- mRNA, tRNA and rRNA. mRNA and tRNA are found in the cytoplasm and rRNA in the nucleus.
  • The ribosomes can be free within the cytoplasm of a cell or attached to the endoplasmic reticulum but do not present inside the nucleus. RNA and ribosomes act together resulting in the synthesis of proteins.

 Hence, the correct answer is option C.

Which of the following is correct : 

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. cell of all living organisms have a nucleus.

  2. Both animal and plant cells have a well defined cell wall.

  3. In prokaryotes, there are no membrane bound organelles.

  4. Cells are formed de novo from abiotic materials.

Show answer
Correct Option: A
Explanation:


  • The cell is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life. 
  • Cells are often called the "building blocks of life". 
  •  Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic, which do not. 
  • Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular. 
  • Hence, the cell of all living organisms have a nucleus is correct.
  • So, the correct answer is 'cell of all living organisms has a nucleus'.

The organelle of plant cell that does not contain functional DNA.

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Nucleus

  2. Chloroplast

  3. Mitochondria

  4. Peroxisome

Show answer
Correct Option: A
Explanation:

Within the nucleus is a small subspace known as the nucleolus. It is not bound by a membrane, so it is not an organelle. This space forms near the part of DNA with instructions for making ribosomes, the molecules responsible for making proteins.

Hence the correct option is A.

Who is odd man among us? Give reason.

biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

  1. Nucleolus

  2. Mitochondria

  3. Plastids

  4. Endoplasmic reticulum

Show answer
Correct Option: A