Cell membrane is selectively permeable due to:

A. Enzymes
B. Phospholipids
C. Cholesterol
D. Proteins

Answer

Correct Answer: D. Proteins

Detail about Mcqs

The correct answer is:
D. Proteins
Explanation:
The selective permeability of the cell membrane is primarily due to the presence of proteins embedded in the lipid bilayer. These membrane proteins function as channels, carriers, or pumps to allow specific substances to pass through the membrane, while blocking others.
Transport proteins play a crucial role in regulating the movement of ions, nutrients, and waste products across the membrane.

During photorespiration an acid glycolate is formed which is converted into glycine by?

A. Peroxisome
B. Golgi Complex
C. Lysosomes
D. Vacuole

Answer

Correct Answer: A. Peroxisome

Detail about Mcqs

The correct answer is:
A. Peroxisome
Explanation:
During photorespiration, which occurs when the enzyme RuBisCO fixes oxygen instead of carbon dioxide, glycolate is produced.
The glycolate is then converted into glycine in the peroxisome, which is one of the organelles involved in the metabolic processes of photorespiration.
This conversion involves a series of reactions where glycolate is first converted into glycine, and then glycine is processed further in the mitochondria.

The human brain is different from an animal’s brain due to:

A. Cerebral cortex is absent in all animal’s brain
B. The cerebral cortex of the animal’s brain is more development
C. The cerebral cortex is absent in the human brain
D. The cerebral cortex of the human brain is more developed

Answer

Correct Answer: D. The cerebral cortex of the human brain is more developed

Detail about Mcqs

The correct answer is:
D. The cerebral cortex of the human brain is more developed
Explanation:
The cerebral cortex is a key feature of the brain responsible for higher cognitive functions, such as reasoning, language, decision-making, and problem-solving.
While animals also possess a cerebral cortex, it is more developed in humans, making humans capable of advanced intellectual and social behaviors.
The size and complexity of the human cerebral cortex, including its folds (gyri and sulci), allow for greater surface area and more neural connections compared to most animals.

The layer of the plant cell wall formed at the time of cytokinesis is?

A. Primary wall
B. Secondary wall
C. Middle lamella
D. Tertiary wall

Answer

Correct Answer: C. Middle lamella

Detail about Mcqs

The correct answer is:
C. Middle lamella
Explanation:
During cytokinesis in plant cells, the cell plate forms between the dividing cells. This cell plate eventually develops into the middle lamella, which is the first layer of the cell wall to form.
The middle lamella is primarily composed of pectins, which act as a glue to hold adjacent cells together.

The pulmonary volume is an essential part of pulmonary ventilation. It depends upon the:

A. Body Composition
B. Body Volume
C. Physical Activity
D. Composition of air

Answer

Correct Answer: C. Physical Activity

Detail about Mcqs

The correct answer is:
C. Physical Activity
Explanation:
Pulmonary volume refers to the amount of air that the lungs can hold during different phases of the respiratory cycle, including tidal volume, inspiratory reserve volume, and expiratory reserve volume.
Physical activity significantly influences pulmonary volume because during exercise or exertion:
Tidal volume (air inhaled/exhaled per breath) increases to meet the body’s higher oxygen demands.
Inspiratory and expiratory efforts become more pronounced, utilizing more lung capacity.

A process by which one glycerol molecule is linked with three fatty acid by the esterificaiton molecule is known as?

A. Phospholipids
B. Acylglycerol
C. Wax
D. Cholesterol

Answer

Correct Answer: B. Acylglycerol

Detail about Mcqs

The correct answer is:
B. Acylglycerol
Explanation:
Acylglycerol (also known as triacylglycerol or triglyceride) is a compound formed when one glycerol molecule is esterified (linked) with three fatty acids.
This process is called esterification, where each fatty acid is joined to the glycerol molecule through an ester bond.

The property of water that is important to biological membrane stability is?

A. Amphoteric
B. Hydrophobic Exclusion
C. Hydrophobic Inclusion
D. Anomalous

Answer

Correct Answer: B. Hydrophobic Exclusion

Detail about Mcqs

The correct answer is:
B. Hydrophobic Exclusion
Explanation:
Hydrophobic exclusion is a key property of water that plays a crucial role in biological membrane stability. This refers to the tendency of water molecules to exclude nonpolar (hydrophobic) substances, forcing them to aggregate in the interior of biological membranes. This helps to maintain the structure of lipid bilayers, which are essential for the function of cell membranes.
In biological membranes, the hydrophobic (water-repelling) tails of phospholipids face inward, away from the water, while the hydrophilic (water-attracting) heads face outward toward the water. This arrangement is stabilized by the hydrophobic exclusion effect.

The hypothalamus produces the signaling molecules like:

A. Pyrogen
B. Spermine
C. Prostaglandin
D. Granzyme

Answer

Correct Answer: A. Pyrogen

Detail about Mcqs

The correct answer is:
A. Pyrogen
Explanation:
The hypothalamus is a critical brain region involved in regulating body temperature, among many other functions. It produces and responds to signaling molecules called pyrogens in response to infections or inflammation. Pyrogens, such as interleukin-1 (IL-1) and tumor necrosis factor (TNF), signal the hypothalamus to increase the body’s set-point temperature, leading to fever. The hypothalamus produces or responds to pyrogens, which are signaling molecules involved in regulating fever and immune responses.

In Electron transport chain ultimate electron acceptor is:

A. Oxygen
B. Cytochrome Complex
C. NADH
D. None of these

Answer

Correct Answer: A. Oxygen

Detail about Mcqs

The correct answer is:
A. Oxygen
Explanation:
In the Electron Transport Chain (ETC), oxygen serves as the ultimate (final) electron acceptor. Here’s how it works:
Electrons are passed along a series of protein complexes and coenzymes embedded in the inner mitochondrial membrane.
As electrons move through the chain, they release energy, which is used to pump protons (H⁺) across the membrane, creating a proton gradient.
At the end of the chain, electrons are transferred to oxygen, which combines with protons to form water: O2+4e^−+4H^+→2H2O

Erythrose is a type of monosaccharides which is commonly known as:

A. Heptose
B. Pentose
C. Triose
D. Tetrose

Answer

Correct Answer: D. Tetrose

Detail about Mcqs

The correct answer is:
D. Tetrose.
Explanation:
Erythrose is a monosaccharide with the chemical formula C₄H₈O₄.
It contains four carbon atoms, classifying it as a tetrose.
Specifically, erythrose is an aldose sugar (an aldotetrose) because it has an aldehyde group.

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