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Cell Biology Mcqs

Q:

Atomic force microscopy uses _____________

A) X-rays B) Infrared light
C) Nanosized tip D) Nickel tip
 
Answer & Explanation Answer: C) Nanosized tip

Explanation: Atomic force microscopy is a type of high resolution scanning probe microscopy that uses the nanosized tip to probe the surface of a macromolecule. Researchers have used this technique to study intermediate filaments.

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387
Q:

Cells that have stopped dividing and are arrested in a state preceding that of DNA synthesis, are said to be in the__________

A) S phase B) G? phase
C) G? phase D) G? phase
 
Answer & Explanation Answer: C) G? phase

Explanation: Cells that have stopped dividing either temporarily or permanently are referred to as being in the G0 state, to distinguish them from cells in the G1 phase that are about to enter the synthesis phase.

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276
Q:

In which of the following cell nucleus is not present?

A) Eukaryotic cell B) Prokaryotic cell
C) Both of the above D) None of the above
 
Answer & Explanation Answer: B) Prokaryotic cell

Explanation: Nucleus is absent in prokaryotic cells. Instead, they have a nucleoid region in the cell.

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136
Q:

Lysosomes are produced by which of the following cell organelles?

A) Mitochondria B) Endoplasmic Reticulum
C) Golgi Complex D) DNA
 
Answer & Explanation Answer: C) Golgi Complex

Explanation: They are produced by the Golgi body. The fusion of vesicles from the Golgi complex with endosomes produces lysosomes.

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128
Q:

DNA denaturation can occur through ________

A) Unwinding of DNA double strand B) Absorbance of UV rays
C) Decrease in hydrophobic interactions of base stacking D) All of the mentioned
 
Answer & Explanation Answer: D) All of the mentioned

Explanation: DNA can denature at high temperature, high or low pH, high salinity, chemical denaturants or enzymes or by physical methods such as excess exposure to UV radiation(or any type of radiation for that matter).

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127
Q:

Proto-oncogenes are possessed by the ______________________

A) RNA virus B) DNA virus
C) Cells themselves D) Pathogenic bacteria
 
Answer & Explanation Answer: C) Cells themselves

Explanation: Proto-oncogenes are the genes present in cells themselves, these genes have the ability to avert a normal cell into a cancerous one. The initial event that led to the discovery of proto-oncogenes was made in 1976 when src gene from avian sarcoma virus was identified.

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127
Q:

Which of the following organisms doesn’t have a cell?

A) Virus B) Bacteria
C) Fungi D) Algae
 
Answer & Explanation Answer: A) Virus

Explanation: Viruses aren’t made up of cells. Their genetic material is protected by a protein covering (either DNA or RNA). However, they lack a cell membrane and other organelles seen in cells.

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123
Q:

Type II myosins are found primarily in __________

A) plant cells B) muscle cells
C) nerve cells D) liver hepatocytes
 
Answer & Explanation Answer: B) muscle cells

Explanation: The conventional myosins, type II are found in the muscle cells. This group of myosins are the best understood.

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