Tag: biology

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Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Deficiency of hormones is caused to due to

  1. Hyposecretion

  2. Hyperscretion

  3. Sweating

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  •  Hyposecretion- too little of any hormone in the body can be caused by a large pituitary tumour, which interferes with the pituitary gland's ability to produce hormones. Hence, Deficiency of hormones is caused to due to Hyposecretion.
So, the correct answer is 'Hyposecretion'.

Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Which of the following is known as chemical messenger?

  1. Hormone

  2. Enzyme

  3. Colostrum

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Hormones are the chemical substances that are secreted in the body by the endocrine glands. They are known as body's chemical messengers.
B. Enzymes are colloidal macromolecules that are water soluble and partially or wholly proteinaceous in nature.
C. Colostrum is a form of milk produced from mammary glands in mammals.
So, the correct answer is 'Hormone'.
Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Enzymes, vitamins and hormones are common in

  1. Being proteinaceous

  2. Being synthesised in the body organisms

  3. Enhancing oxidative metabolism

  4. Regulating metabolism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Feedback inhibition is the process by where the end product terminates the reaction. The accumulation of the end product interferes with the enzymatic activity by changing the shape of its active site. Enzymes and hormones regulate the metabolism by feedback inhibition.
Enzymes are protein in nature and catalyzes the biological reaction without being used up in the chemical reaction. They regulate the chemical reaction by feedback inhibition. 
Hormones are the chemical messenger which activates the effector gland and regulate the metabolism by feedback inhibition.
Vitamins acts as a coenzymes which regulates the enzymatic activity and further regulate the metabolism.
So, the correct answer is option D.

Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Which of the statements given below are correct 
I) Hormones are non-nutrient chemical 
II) Hormones act as intracellular chemicals
III) Hormones are produced in moderate quantity
IV) Hormones may be proteins, steroids , glycoproteins or biogenic amines

  1. I and II

  2. II and III

  3. III and IV

  4. I and IV
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Hormones are non-nutrients chemicals which act as .............. messengers and are produced in ........... amount.

  1. Intracellular, large

  2. Intercellular, large

  3. Intracellular, small

  4. Intercellular, trace
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amount. They are released from the ductless glands called as endocrine glands. They affect the activity of another part of the body called as target site. They are not stored in the body.

Thus, the correct answer is 'Intercellular, trace.'

Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Read the given paragraph and select the option that correctly fills the blanks in it.
Hormones produce their effect on target tissue by binding to specific ______A called hormone receptors located in the target tissues only. Water soluble hormones usually need ___B receptor that generate ___C messengers for regulating cellular metabolism. ____D soluble hormones can pass through cell membrane and bind to ______E receptors, mostly nuclear receptors. The hormone receptors complex enter the nucleus and mostly regulate gene expression or chromosome function by interaction of hormone-receptor complex with the genome.

  1. A-proteins, B-membrane bound, C- second, D- lipid, E-intracellular

  2. A-lipids, B-membrane bound, C-second, D-water, E-intracellular

  3. A-proteins, B-intracellular, C-second, D-lipid, E-extra cellular

  4. A-proteins, B-membrane bound, C-primary, D-lipid, E-intracellular
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Hormones produce their effect on target tissue by binding to specific proteins called hormone receptors located in the target tissues only. Water soluble hormones usually need membrane-bound receptors that generate second messengers for regulating cellular metabolism. Lipid soluble hormones can pass through the cell membrane and bind to intracellular receptors, mostly nuclear receptors. The hormone-receptor complex enters the nucleus and mostly regulate gene expression or chromosome function by an interaction of the hormone-receptor complex with the genome.
Thus, the correct answer is 'A-proteins, B-membrane bound, C- second, D- lipid, E-intracellular.'
Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

One of the following hormone is different from the other three regarding their solubility.

  1. Epinephrine

  2. Aldosterone

  3. Steroid hormones

  4. Iodothyronines
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hormones can be classified based on their solubility into hydrophilic and lipophilic hormones. Hydrophilic hormones are soluble in water. They are mostly amino-based proteins. Examples include epinephrine, norepinephrine, insulin. Lipophilic hormones are soluble in lipids. They are steroids and thyroxine. Examples includes aldosterone, steroid hormones, iodothyronines.

Thus, the correct answer is 'Epinephrine.'

Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Hormones "obey" the commands like "enough, slow down or "two little, speed up".

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Hormones are poured directly into blood the bloodstream and control physiological processes by chemical means. Their action depends on the feedback mechanism. 
So, the correct answer is 'False'
Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

Which one of the following act as vasodilator?

  1. Vasopressin

  2. Angiotensin II

  3. Renin

  4. Atrial natriuretic factor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Atrial natriuretic factor cause dilation of the afferent arterioles and constriction of the efferent arterioles leading to a primary increase in GFR.

So the correct answer is 'Atrial natriuretic factor'.

Multiple choice biology chemical coordination and integration hormones coordination in human beings- chemical control endocrine system in humans

How many of these hormones are water soluble ? Thyroxine, Epinephrine, Nor-epinephrine , Aldosterone, Cortisol, Testosterone, Thymosin, Melatonin, Calcitonin

  1. 5

  2. 4

  3. 6

  4. 9
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Water-soluble hormones include glycoproteins, catecholamines, and peptide hormones composed of polypeptides. Receptors for peptide hormones are located on the plasma membrane because they have bound to a receptor protein located on the plasma membrane.
  • Thyroxine, Aldosterone, Cortisol, Testosterone are lipid soluble hormones.
  • Epinephrine, Non-epinephrine, Thymosin, Melatonin and Calcitonin are water-soluble hormones.
Hence, the correct answer is '5'.