Tag: nucleus

Quizzes (3) Questions (83)

Questions Related to nucleus

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

The nuclear material without nuclear membrane is observed in

  1. Bacteria and green algae

  2. Cyanobacteria and red algae

  3. Bacteria and cyanobacteria

  4. Mycoplasma and green algae
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria and cyanobacteria are prokaryotes, i.e., having pro or primitive karyon. These cells have primitive nucleus, not having a distinct nuclear membrane. These cells have a single circular molecule of DNA as genetic material but it is not present inside membrane bound nucleus.

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

Nucleolemma is a part of

  1. Nuclear membrane

  2. Nuclear reticulum

  3. Nucleolus

  4. Nucleoplasm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nucleo-lemma is a term used in parallel with plasma-lemma. The nucleo-lemma is a part of the nuclear membrane. The outer membrane may have ribosomes and interconnections with ER. Nuclear membrane has a large number of pores for the nucleo-cytoplasmic exchange of materials.

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

Which of the following is not contained in a eukaryotic nucleus?

  1. Nucleosome

  2. Nucleolus

  3. Chromatin

  4. Circular DNA molecules
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prokaryotic cells like bacteria have a single circular DNA molecule as their genetic material which is also called as a bacterial chromosome. The eukaryotic cells have a prominent nucleus with species-specific number of linear chromosomes having well-defined centromere and telomeres.

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

Name the cell organelle which is called the 'Control room of the cell'.

  1. Nucleus

  2. Mitochondria

  3. Chloroplast

  4. Ribosome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The nucleus is the most important part of the cell which regulates all the cellular activities by controlling the enzymes required for cellular processes. Enzymes are proteins and protein synthesis is controlled by nucleus as mRNA required for protein synthesis is made from DNA, which is situated in the nucleus. Hence, the nucleus is the control room of the cell.
So, the correct answer is option A.
Multiple choice biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

The mature mammalian red blood cells are incapable of further division because

  1. DNA sequences are redundant

  2. The nuclei are lobed

  3. They lack nuclei

  4. The mitotic apparatus is absent
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Because of the lack of nuclei and organelles, mature red blood cells do not contain DNA and cannot synthesize any RNA, and consequently can not divide and have limited repair capabilities. 

So, the correct option is C. (They lack nuclei)

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

Which of the following statements about nucleus and nucleolus is right?

  1. <font color="#222222">The nucleus is membrane-bound while the nucleolus is non-membrane bound.</font>

  2. The nucleolus is membrane-bound while the nucleus is non-membrane bound.

  3. Both nucleolus and nucleus are membrane bound

  4. Both nucleus and nucleolus are not membrane bound.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nucleus is a membrane-bound structure which is separated from the cytoplasm. This membrane is a nuclear membrane which has small pores which allow diffusion. The nucleolus is the centre dark part of the nucleus which is not surrounded by any kind of membrane. It is distinguished from nuclear material by its colour only.

So, the correct option is 'The nucleus is membrane-bound while the nucleolus is non-membrane bound'.

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

Nucleus is

  1. The largest organelle in the cell

  2. The organelle which contains chromosomes

  3. The organelle with a double membrane

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Nucleus is the largest cell organelle which contains the chromosomes. The nucleus has a nuclear membrane which is made up of two layers i.e it is and organelle with a double-membrane.