Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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.

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

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

  1. Endoplasmic reticulum

  2. Cell membrane

  3. Plasma membrane

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology cell-the basic unit of life nucleus organelles in cell membranous and non-membranous organells

Which of the following separates the nucleoplasm with the cytoplasm?

  1. Cell membrane

  2. Nuclear membrane

  3. Endoplasmic reticulum

  4. Golgi body
Reveal answer Fill a bubble to check yourself
B Correct answer
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.