Which of these are most widely used in genetic engineering?
Plastid
Plasmid
Mitochondrion
Ribosome
B.
Plasmid
Plasmids are autonomous elements, whose genomes exist in the cell as the extra chromosomal unit. These are found in bacteria. They are used as cloning vectors due to their increased yield potential.
Plastids are semi autonomous cell organelles. They take part in storage and synthesis of organic compounds.
Mitochondria are called the power houses of the cell as they are the centres of Kreb's cycle of respiration liberating the maximum amount of energy.
Ribosomes are sub- microscopic cell organelles manufacturing protein.
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
Match the Column I with that of Column II and choose the correct combination from the options given.
| Column I | Column II |
| A. Rough ER | 1. Synthesis of glycoproteins |
| B. Smooth ER | 2. Aerobic respiration |
| C. Mitochondria | 3. Synthesis of lipid |
| D. Golgi apparatus | 4. Protein synthesis |
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
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
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
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
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
Which of the following cell organelle is excluded from endomembrane system?
Endoplasmic reticulum
Mitochondria
Golgi complex
Lysosomes
Lysosomes
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
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
