Class 11 Biology Mcqs

Q:

The receptor for estrogen is intracellular. True or false?

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Estrogen is a steroid hormone secreted by the ovaries. Since it is a steroid hormone, estrogen can easily pass through the lipid bilayer of the cell membrane without a receptor. Thus its receptor lies in the cytoplasm, or the receptor is intracellular.

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16
Q:

Which of these functions is not regulated by intracellular hormone-receptor complexes?

A) Regulation of gene expression B) Regulation of chromosome function
C) Interaction with the genome D) Regulation of K+ entry into the cell
 
Answer & Explanation Answer: D) Regulation of K+ entry into the cell

Explanation: Intracellular hormone-receptor complexes transmit signals mainly to the nucleus for the regulation of gene expression, regulation of chromosome function through indirect interaction with the genome.

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14
Q:

IP₃ is a(n) _____

A) secondary messenger B) membrane receptor
C) intracellular receptor D) nuclear receptor
 
Answer & Explanation Answer: A) secondary messenger

Explanation: IP₃ is an important secondary messenger. When a hormone binds to a receptor, it forms a hormone receptor complex. This hormone receptor complex transmits a secondary signal inside the cell via secondary messengers.

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17
Q:

Adrenaline is derived from ______

A) lipopolysaccharides B) amino acids
C) lipids D) sugars
 
Answer & Explanation Answer: B) amino acids

Explanation: Adrenaline or epinephrine is derived from amino acids. It is secreted by the outer cortex of the pair of adrenal glands. It is the emergency hormone secreted during a fight or flight response.

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52
Q:

Hypothalamic hormones are ______

A) peptides B) steroids
C) iodothyronines D) amino acid derivates
 
Answer & Explanation Answer: A) peptides

Explanation: Hypothalamic hormones are peptides. They are secreted by the hypothalamus. Peptides, steroids, iodothyronines and amino acid derivatives are the different categories of hormones.

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15
Q:

What type of hormone is glucagon?

A) Iodothyronines B) Steroids
C) Peptide D) Amino acid derivatives
 
Answer & Explanation Answer: C) Peptide

Explanation: Glucagon is a peptide hormone. It is synthesized and secreted by the alpha cells of the pancreas. The function of glucagon is to break glycogen into glucose. This raises the blood sugar level.

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12
Q:

Which of these is false regarding receptors?

A) Intracellular receptors are present within the cell B) Receptors form complexes with hormones
C) Receptors disintegrate after contact with hormones D) Receptors are specific
 
Answer & Explanation Answer: C) Receptors disintegrate after contact with hormones

Explanation: Receptors are the structures of the cell to which hormones bind and form hormone-receptor complex. They do not disintegrate. Receptors are specific for each hormone. Intracellular receptors are present in the cytoplasm.

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30
Q:

Hormone receptors are ______

A) glycolipids B) lipids
C) polysaccharides D) proteins
 
Answer & Explanation Answer: D) proteins

Explanation: Hormone receptors are proteinaceous in nature. These receptors are located on or inside the cells. It is where a hormone binds on a cell. The binding of the hormone signals the cells to perform their tasks.

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