Tag: zoology

Questions Related to zoology

Which of the following hormones is not chemically a glycoprotein? 

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Growth hormone

  2. Prolactin

  3. Luteinising hormone

  4. Estrogen

Show answer
Correct Option: D
Explanation:
A. Growth hormone is a glycoprotein secreted by adenohypophysis of pituitary gland which helps in growth of body.
B. Prolactin is a glycoprotein secreted by adenohypophysis of pituitary gland which stimulates production and secretion of milk.
C. Luteinising hormone is a glycoprotein secreted by adenohypophysis of pituitary gland which induced ovulation.
D. Estrogen is a steroid hormone secreted by ovaries which help in development of female sexual characters.
So, the correct answer is 'Estrogen'.

Chemically epinephrine is 

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Amino acid derivative

  2. Steroid

  3. Peptide

  4. Glucocorticoid

  5. None of the above

Show answer
Correct Option: A
Explanation:
Hormones have different chemical nature depending upon the type of molecules they are made up of. Some hormones like epinephrine are amino acid derivatives. Epinephrine, also known as adrenaline is secreted from adrenal medulla. It is derived from amino acid tyrosine. It contains a nitrogen atom and hence, known as amine. Epinephrine is secreted in response to stress conditions in the body and induces fight or flight reactions in the body.
So, the correct answer is 'Amino acid derivative'.

Which of the following hormones is a steroid?

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Oestrogen

  2. Insulin

  3. Glucagon

  4. Thyroxine

Show answer
Correct Option: A
Explanation:

Steroid hormones are derived from cholesterol and are lipid-soluble molecules. Examples of steroid hormones include the sex hormones (androgens, oestrogens, and progesterone). Oestrogens helps in development and maintenance of an individual's feminine characteristics. Whereas, insulin, glucagon, and thyroxin are the protein hormone 

So, the correct answer is option A.

Biogenic amines are synthesized from

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Tryptophan

  2. Tyrosine

  3. Glutamic acid

  4. Phenylalanine

Show answer
Correct Option: B
Explanation:
Amines are the compounds that contain an amine group. They are formed as a result of deamination, a process in which amino group is removed from the amino acid. Some hormones like epinephrine and norepinephrine are amines. They are derived from amino acid tyrosine. 
So, the correct answer is 'Tyrosine'.

Which of the following hormones is a derivative of fatty acids?

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Gastrin

  2. Thymosin

  3. Estrogen

  4. Prostaglandins

Show answer
Correct Option: D
Explanation:
A. Gastrin hormone is a derivate of protein.
B. Thymosin hormone is a derivate of peptide.
C. Estrogen hormone is a derivate of steroid.
D. Prostaglandins hormone is a derivate of fatty acids.
So, the correct answer is 'Prostaglandins'.

Which one of the following is a peptide hormone:-

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Glucagon

  2. Testosterone

  3. Thyroxin

  4. Adrenaline

Show answer
Correct Option: A
Explanation:
Glucagon is a single chain peptide of 29 amino acids, synthesised by the α-cells in the islets of Langerhans of the pancreas.

So, the correct answer is 'Glucagon'.

Supra optic nuclei (in hypothalamus) secrete the hormone.

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. ADH

  2. Oxytocin

  3. Pitocin

  4. Both (2) and (3)

Show answer
Correct Option: A

Steroid hormones easilu pass through the plasma membrane by simple diffusion because they _______________.

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Are water soluble

  2. Contain carbon and hydrogen

  3. Enter through pores

  4. Are lipid soluble

Show answer
Correct Option: D

Choose the correct answer from the alternatives given.
Peptide hormones:

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. are received by a receptor located in the plasma membrane

  2. are received by a receptor located in the cytoplasm

  3. bring about the transcription of DNA

  4. both (a) and (c)

Show answer
Correct Option: A
Explanation:

Hormones produce their effects on target tissues by binding to specific proteins called hormone receptors located in the target tissue only. Hormone receptors present on the cell membrane of the target cells are called membrane-bound receptors and the receptors present inside the target cell are called intracellular receptors, mostly nuclear receptors (present in the nucleus. 

So the correct answer is are received by a receptor located in the plasma membrane.

Read the following pioints :- 
(i) Increase GFR
(ii) Increase B.P
(III) Decreases Blood Volume
(iv) Increases aldosterone secretion 
(v) Vasoconstrictor
(vi) Increases Na excretion
How many points are correct about angiotensin II?

zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

  1. Two

  2. Three

  3. Four

  4. Five

Show answer
Correct Option: A
Explanation:

Angiotensin II - is a vasoconstrictor which causes an increase in BP (means a decrease in blood volume),  increase Na+ reabsorption, does not alter GFR, Angiotensin II can stimulate aldosterone secretion. 

So, the correct option is 'Two'.