Question # 1

The enzyme function between a PH of ..................... .

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2 to 4

6 to 8

8 to 10

1 to 2

Lock and key model was proposed by:

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Emil Fischer

Melcher

Koshland

Saugeo

Which of the following chambers has the thickest walls in human heart?

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Right atrium

Left atrium

Left ventricle

Right ventricle

The word virus is derived from Latin word _____________

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Venomeq

Bacter

Venus

Both a& b

An example of macromolecule is.

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Water

Glucose

Protein

NaCl

What reason would you suggest for the fact that the total DNA content of each daughter cell is reduced during meiosis?

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Chromosomes do not replicate during the interphase before meiosis 1

Chromosomes do not duplicate between meiosis 1 and 2

Half of the chromosomes form each gamete are broken

Sister chromatids separate during anaphase of meiosis 1

Which of the followings in not true about the opening and Closing of Stomata?

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Light helps in the opening and closing of stomata

K⁺ ions are responsible for the opening and closing of stomata

The osmosis of water is responsible for the opening and closing of stomata

None for these

The chloroplast functions in______.

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ATP synthesis

Protein synthesis

Photosynthesis

DNA replication

When an enzyme is no longer able to work, it is said to be:

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Catalyzed

Dead

Cofactored

Denatured

Ribisomes are constructed in the ___________

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Endoplasmic reticulum

Bucleoid

Nucleolus

Nuclear pore

In turner's syndrome female have ................. chromosomes .

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46

45

47

22

Which of these bioelements is in the highest perfentage in protoplasm.

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Carbon

Hydrogen

Oxygen

Nitrogen

Cell membrane i present in _______________ cells.

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Plants

Animals

Both

NOne

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