Cell Biology MCQs | BIO201 MCQs | Set 3
Cell Biology MCQs | BIO201 MCQs | Set 3
MCQs (Multiple Choice Questions)
1) How much water is present in a cell?
a) 50%
b) 60%
c) 70%
d) 80%
Correct Answer:
The correct answer is 'c'.
Explanation:
The approximate percentage of water content in a typical cell is around 70% because water is a crucial component of living cells. It plays various essential roles in cellular processes. Animal cells are about 70% water by weight. Plant cells have even more water, at about 80%. Bacterial cells are about 75% water.
Water is essential for life. It helps to transport nutrients and waste products, regulate body temperature, and protect cells from damage. Water also plays a role in many chemical reactions that take place inside cells.
It is important to stay hydrated by drinking plenty of water throughout the day. This is especially important during hot weather or when exercising, when you lose water through sweat.
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2) Charge on DNA is
a) Positive
b) Negative
c) Neutral
d) None
Correct Answer:
The correct answer is 'b'.
Explanation:
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3) Which of the following stabilizes cell shape
b) RNA
d) Myosin
Correct Answer:
The correct answer is 'c'
Explanation:
Actin is a protein that plays a key role in maintaining the shape and structure of cells. It is a major component of the cytoskeleton and is involved in various cellular processes, including providing structural support and stability to the cell. DNA and RNA are genetic molecules, while myosin is a motor protein involved in muscle contraction and cell movement, but actin is specifically associated with stabilizing cell shape.
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4) ________ energy is the energy of motion.
a) Kinetic
b) Potential
c) Atomic
d) Chemical
Correct Answer:
The correct answer is 'a'.
Explanation:
Kinetic energy is the energy associated with motion. It is the energy a body possesses because of its motion, and it depends on the mass and velocity of the object.
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5) Space between double membrane structure of endoplasmic reticulum is called
a) Vesicles
b) Leumen
c) Cavity
d) endoplasmic space
Correct Answer:
The correct answer is 'b'.
Explanation:
The space between the double membrane structure of the endoplasmic reticulum is called the lumen. The lumen is a fluid-filled space that is continuous with the perinuclear space, the space between the outer nuclear membrane and the endoplasmic reticulum.
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6) ____________is one of the example of co-factor
a) Copper
b) Biotin
c) Haeme
d) All
Correct Answer:
The correct answer is 'd'.
Explanation:
All of the options listed (Copper, Biotin, and Heme) can serve as cofactors in various biological processes. Cofactors are molecules or ions that assist enzymes in performing their catalytic functions. Copper, Biotin, and Heme are examples of such cofactors in different enzymatic reactions.
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7) Lipids act as a following in which many components of cell membrane floats
a) Pond
b) Lake
c) River
d) Stream
Correct Answer:
The correct answer is 'b'.
Explanation:
Lipids, particularly phospholipids, are the primary components of the cell membrane. The cell membrane is a selectively permeable barrier that separates the inside of the cell from its external environment. It consists of a double layer of lipid molecules, known as the lipid bilayer. This lipid bilayer has a hydrophobic (water-repellent) region, which is formed by the fatty acid tails of the phospholipids, and a hydrophilic (water-attracting) region, which is formed by the phosphate head groups.
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8) DNA replicates during:
a) G0 phase
b) G1 phase
c) G2 phase
d) S phase
Correct Answer:
The correct answer is 'd'.
Explanation:
DNA replication occurs during the S (synthesis) phase of the cell cycle. In this phase, the cell duplicates its DNA to prepare for cell division, ensuring that each daughter cell will receive a complete and identical set of genetic information.
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9) Difference between the alpha 1-4 glycosidic and beta 1-4 glycosidic bonds is on the basis of:
a) Specificity
b) Stability
c) size and shape
d) neutral pH
Correct Answer:
The correct answer is 'a'.
Explanation:
The alpha and beta designation in glycosidic bonds refers to the orientation of the hydroxyl group (OH) at the first carbon (anomeric carbon) of one sugar molecule relative to the fourth carbon of another sugar molecule. In alpha 1-4 glycosidic bonds, the hydroxyl group is oriented in the opposite direction from beta 1-4 glycosidic bonds. This orientation difference affects the specific arrangement of monosaccharide units in a polysaccharide chain, leading to distinct structural and functional properties.
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10) Example of variable expressivity:
a) Dementia
b) Huntington disease
c) Alzheimer disease
d) Pancreatic necrosis
Correct Answer:
The correct answer is 'b'.
Explanation:
Variable expressivity refers to the phenomenon where individuals with the same genetic mutation can exhibit a range of different symptoms or severity of a particular genetic disorder. Huntington disease is a classic example of a genetic disorder with variable expressivity. People with the mutated Huntington gene may experience a wide spectrum of symptoms and disease onset, making the expressivity of the disorder variable among affected individuals. Some may develop symptoms at an earlier age and experience a more severe form of the disease, while others may have a later onset and milder symptoms. This variability is a hallmark of variable expressivity in genetic disorders.
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