In humans, at the end of the first meiotic division, the male germ cells differentiate into the

1.  primary spermatocytes

2.  secondary spermatocytes

3.  spermatids

4.  spermatogonia

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4
Correct Answer :

secondary spermatocytes


Explanation :
No Explanation available for this question

Which extra embryonic membrane in humans prevents desiccation of the embryo inside the uterus

1.  Chorion

2.  Allantois

3.  Yolk sac

4.  Amnion

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4
Correct Answer :

Amnion


Explanation :
No Explanation available for this question

Consider the statements given below regarding contraception and answer as directed thereafter (A) Medical Termination of Pregnancy (MTP) during first trimester is generally safe (B) Generally chances of conception are nil until mother breast-feeds the infant upto two year (C) Intrauterine devices like copper-T are effective contraceptives (D) Contraception pills may be taken upto one week after coitus to prevent conception Which two of the above statements are correct

1.  B, C

2.  C, D

3.  A, C

4.  A, B

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4
Correct Answer :

A, C


Explanation :
No Explanation available for this question

What is true about T-lymphocytes in mammals

1.  They scavenge damaged cells and cellular debris

2.  These are produced in thyroid

3.  There are three main types — cytotoxic T-cells, helper T-cells and suppressor T-cells

4.  These originate in lymphoid tissues

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4
Correct Answer :

There are three main types — cytotoxic T-cells, helper T-cells and suppressor T-cells


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No Explanation available for this question

Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called

1.  biotic potential

2.  environmental resistance

3.  morbidity

4.  Fecundity

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4
Correct Answer :

environmental resistance


Explanation :
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The term "antibiotic" was coined bya

1.   Selman Waksman The term "antibiotic" was coined by

2.  Alexander Flemming

3.  Edward Jenner

4.  Louis Pasteur

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4
Correct Answer :

Selman Waksman

The term "antibiotic" was coined by

Explanation :
No Explanation available for this question

Carcinoma refers to

1.  malignant tumours of the colon

2.  benign tumours of the connective tissue

3.  malignant tumours of the connective tissue

4.  malignant tumours of the skin or mucous membrane

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4
Correct Answer :

malignant tumours of the skin or mucous membrane


Explanation :
No Explanation available for this question

Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorised as

1.  cellular immunity

2.  innate non-specific immunity

3.  active immunity

4.  passive immunity

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4
Correct Answer :

passive immunity


Explanation :
No Explanation available for this question

ELISA is used to detect viruses where the key reagent is

1.  DNA probe

2.  RNAase

3.  alkaline phosphatase

4.  catalase

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4
Correct Answer :

alkaline phosphatase


Explanation :
No Explanation available for this question

Maximum application of animals cell culture technology today is in the production of :

1.  vaccines

2.  edible proteins

3.  insulin

4.  Interferons

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4
Correct Answer :

vaccines


Explanation :
No Explanation available for this question
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