Which of the following statements are true about the PR interval?

a. It includes the P wave and the PR segment

b. The beginning of electrical excitation of the atria and the beginning of excitation of the ventricles.

c. Conduction time through the AV node.

d. P wave + PR segment + QRS Complex

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#Question id: 23522

#General Aptitude

Biosphere Reserves are also notified as

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#Question id: 10410

#Unit 6. System Physiology – Plant

phytochrome red and far-red light. Given below experiment of lettuce seed, which of the following option will be incorrect?

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#Question id: 3874

#Unit 3. Fundamental Processes

A branched (“lariat”) structure is formed during:

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#Question id: 23432

#General Aptitude

If D is the brother of B, how B is related to C? To answer this question which of the statements is/are necessary?

1.The son of D is the grandson of C

2. B is the sister of D

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#Question id: 15774

#Unit 5. Developmental Biology

When the inner cells are removed from the mammalian embryo and cultured in vitro, they establish a population of pluripotent cells, which is