Cell Biology MCQs | BIO201 MCQs | Set 4
Cell Biology MCQs | BIO201 MCQs | Set 4
MCQs (Multiple Choice Questions)
1) Following has a major role in down syndrome
a) Maternal age
b) Fraternal age
c) Child age
d) Relative age
Correct Answer:
The correct answer is 'a'.
Explanation:
Down syndrome is more commonly associated with advanced maternal age, particularly in pregnancies of women over the age of 35. The risk of having a child with Down syndrome increases as a woman gets older. This is because older eggs are more likely to have abnormalities in chromosome numbers, which is a key factor in Down syndrome.
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2) DNA replication obeys
a) Dispersive model
b) Conservative model
c) Semi-conservative model
d) Distractive model
Correct Answer:
The correct answer is 'c'.
Explanation:
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3) Missing of enzyme homogentisic acid oxidase caused
b) Parkinson disease
d) Cystic fibrosis
Correct Answer:
The correct answer is 'c'.
Explanation:
The missing enzyme homogentisic acid oxidase is associated with alkaptonuria. Alkaptonuria is a rare inherited genetic disorder characterized by the accumulation of homogentisic acid in the body due to a deficiency of the enzyme homogentisic acid oxidase. This condition results in the darkening of urine and a condition known as "ochronosis," where homogentisic acid deposits in connective tissues and causes them to turn dark and brittle. The other options (phenylketonuria, Parkinson's disease, and cystic fibrosis) are unrelated to homogentisic acid oxidase deficiency.
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4) The RNA is __________ while DNA is __________.
a) double stranded, double stranded
b) single stranded, double stranded
c) double stranded, single stranded
d) partially double stranded, double stranded
Correct Answer:
The correct answer is 'b'.
Explanation:
RNA (ribonucleic acid) is a single-stranded molecule, which means it consists of a single strand of nucleotides. In contrast, DNA (deoxyribonucleic acid) is double-stranded, with two complementary strands of nucleotides twisted together in a double helix. This fundamental structural difference is a key distinction between RNA and DNA, and it's reflected in the given answer.
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5) Ribosome after protein formation arrives at
a) Lysosome
b) Rough endoplasmic reticulum
c) Smooth endoplasmic reticulum
d) Golgi bodies
Correct Answer:
The correct answer is 'b'.
Explanation:
The rough endoplasmic reticulum (RER) is a network of membranes that is covered in ribosomes. Ribosomes are the organelles that synthesize proteins. After a protein is synthesized by a ribosome on the RER, it is inserted into the RER membrane. The RER then transports the protein to the Golgi apparatus for further processing and packaging.
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6) The nucleus membrane is continuous with
a) golgi apparatus
b) ribosomes
c) endoplasmic reticulum
d) nucleus
Correct Answer:
The correct answer is 'c'.
Explanation:
The nuclear envelope, which consists of an inner and an outer membrane, is continuous with the endoplasmic reticulum (ER). This means that the membranes of the endoplasmic reticulum are physically connected to the nuclear envelope. This connection allows for the exchange of lipids and proteins between the nucleus and the ER and plays a role in various cellular processes, including the transport of molecules in and out of the nucleus and the synthesis and modification of proteins in the ER. So, the correct answer is c) endoplasmic reticulum.
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7) Power generating organelle of cell is:
a) golgi bodies
b) nucleus
c) mitochondria
d) cell membrane
Correct Answer:
The correct answer is 'c'.
Explanation:
Mitochondria are often referred to as the "powerhouses" of the cell because they are responsible for producing energy in the form of adenosine triphosphate (ATP) through a process known as cellular respiration. This energy is used by the cell to carry out various functions.
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8) An observable feature in the subject of genetics is called:
a) Trait
b) Character
c)
Phenotype
d) All
Correct Answer:
The correct answer is 'd'.
Explanation:
All the options listed (Trait, Character, Phenotype) can be used to describe observable features in genetics, and they are often used interchangeably. Traits and characters both refer to specific genetic features, while phenotype describes the physical expression of those genetic features.
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9) Extension step of PCR occurs at a temperature of:
a) `72^o` C
b) `92^o` C
c) `52^o` C
d) `62^o` C
Correct Answer:
The correct answer is 'a'.
Explanation:
During the extension step, the DNA polymerase enzyme extends the primers by adding complementary nucleotides to the template DNA strand. The temperature of 72°C is commonly used for this step because it is within the optimal range for the DNA polymerase to function effectively.
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10) Lactose can be a nutrient source for bacteria, it is a ________:
a) disaccharide
b) monosaccharide
c) polysaccharide
d) lipid
Correct Answer:
The correct answer is 'a'.
Explanation:
Lactose is a sugar composed of two monosaccharides, specifically glucose and galactose, linked together.
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