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During PCR, primers bind to the DNA strands in the ______ step.

Which of the following are secondary lymphoid organs?
(a) Bone marrow
(b) Tonsils
(c) Spleen
(d) Thymus
Choose the correct answer from the options given below:

Match List-I with List-II.
List-I:
(A) Excess growth hormone
(B) Luteinizing hormone
(C) Vasopressin
(D) Oxytocin
List-II:
(I) Reabsorption of water and electrolytes in kidney
(II) Contraction of uterus during child birth
(III) Acromegaly
(IV) Ovulation
Choose the correct answer from the options given below:

How many theca are present in each lobe of a typical bilobed angiosperm anther?

Given below are two statements:
Statement I: Plasmids are autonomously replicating DNA.
Statement II: Plasmids are extrachromosomal DNA.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following enzymes synthesizes precursor of mRNA, the heterogeneous nuclear RNA (hnRNA)?

Which of the following is the correct order of arrangement of vertebrate column from the head to toe?

Which of the following are primary consumers in a food chain?

Which of the following hormone is not secreted by human placenta?

Sperm motility is due to

Match List-I with List-II.
List-I:
A. Transformation
B. Cloning site
C. Selection
D. Ori
List-II:
I. Restriction enzyme
II. Transfer DNA to host bacteria
III. Replication
IV. Antibiotic
Choose the correct answer from the options given below:

Which of the following disease is not sexually transmitted?

Colostrum, secreted by mother during initial days of lactation, is abundant in

The opening between the right atrium and the right ventricle is guarded by

Which of the following struture is not a part of the male reproductive system?

Which of the following is used as a clot buster?

The covering of ovum at ovulation is

Which of the following plant produces non-albuminous seeds?

Given below are two statements:
Statement I: Modern Homo sapiens arose in Australia and moved across continents.
Statement II: Homo sapiens arose around 75000 to 10000 years ago.
In the light of the above statements, choose the most appropriate answer from the options given below:

Sponges exchange $O_{2}$ with $CO_{2}$ by