Which of the following cell organelle is excluded from endomembrane system?

• Endoplasmic reticulum

• Mitochondria

• Golgi complex

• Lysosomes

• Lysosomes

Barr body is found in the cytoplasm during

• interphase in cell of female mammal

• interphase in cell of male mammal

• prophase in cell of female mammal

• prophase in cell of male mammal

Which of the following prokaryotic structures has all the below mentioned roles?

i. They help in respiration

ii. They help in cell wall formation

iii. They help in DNA replication

iv. They increase surface area of plasma membrane.

• Chromosome

• Ribosome

• Mesosome

• Lysosome

• Lysosome

Which of these organelles does not contain ribosomes?

I. Rough endoplasmic reticulum

II. Chloroplast

III. Golgi apparatus

IV. Mitochondria

• I and II only

• I and IV only

• IV only

• III only

• III only

One type of chromosome has middle centromere whereas
the other has a terminal centromere. They are

• Metacentric and acrocentric

• Metacentric and telocentric

• Sub-metacentric and telocentric

• Telocentric and acrocentric

• Telocentric and acrocentric

What is a nucleosome?

• A vesicle containing positively charged histones within nucleolus

• They are similar to endosomes

• A structure formed by wrapping of negatively charged DNA around positively charged histone octamer

• They are the transforming principles discovered by Griffith

• They are the transforming principles discovered by Griffith

Choose the matched ones.

(A) Vibrio - Rod like bacteria

(B) Mesosome - Helps in cell wall formation

(C) Smooth endoplasmic - Synthesis of lipid reticulum

(D) Vacuoles - Rich in hydrolytic enzymes

• (B) and (C) only

• (A) and (D) only

• (A), (B) and (C) only

• (B) and (D) only

• (B) and (D) only

Which of these are most widely used in genetic engineering?

• Plastid

• Plasmid

• Mitochondrion

• Ribosome

Assertion : Plasma membrane is exceedingly thin and not visible as a separate layer. 

Reason : It appears merely as a surface layer of cytoplasm.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true

Match the Column I with that of Column II and choose the correct combination from the options given.

• A - 1; B - 2; C - 3; D - 4

• A - 2; B - 3; C - 4; D - 1

• A - 3; B - 4; C - 2; D - 1

• A - 4; B - 3; C - 2; D - 1

• A - 4; B - 3; C - 2; D - 1