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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance. D) None of the above
 
Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation:
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Q:

As an infant, the ability to produce antibodies is

A) about 80% of that of an adult B) nonexistent
C) limited D) the same as an adult
 
Answer & Explanation Answer: C) limited

Explanation:

As an infant, the ability to produce antibodies is limited.

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Q:

How many Nucleotides make up a Codon?

A) 3 B) 4
C) 5 D) 6
 
Answer & Explanation Answer: A) 3

Explanation:

3 Nucleotides make up a Codon. 

The nucleotide triplet that encodes an amino acid is called a codon.

Each group of three nucleotides encodes one amino acid.

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Q:

The commercial and marketing arm of ISRO is

A) Antrix Corporation Limited B) ISRO Satelliet Corporation
C) Space Applications Center D) None
 
Answer & Explanation Answer: A) Antrix Corporation Limited

Explanation:
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Q:

"When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler".

A) Law of conservation of energy B) Newton's third law of motion
C) Law of Inertia D) Law of conservation of momentum
 
Answer & Explanation Answer: C) Law of Inertia

Explanation:
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Q:

Red Data Book contains

A) Rare minerals B) Vanishing rivers
C) Red pandas D) Rare plants & animals under threat
 
Answer & Explanation Answer: D) Rare plants & animals under threat

Explanation:

It is a public document used to keep information about rare plants, animals, fungi etc... that exist within the territory. It is a Russian Federation Book.

Red_data_book_contains1561550192.jpg image

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Q:

Self pollination will lead to

A) Inbreeding B) Over breeding
C) Outbreeding D) Rare breeding
 
Answer & Explanation Answer: A) Inbreeding

Explanation:

Self pollination occurs in the flowers when the pollen grains of the flower falls on the stigma of the same due to wind or insects like moths and bees. This lead to the inbreeding.

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Q:

Stress is a factor that contributes to heart disease risk.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True, Stress is a factor that contributes to heart disease risk.


More factors that contributes to heart disease risk are blood pressure, cholesterol, smoking, physical inactivity and overeating.

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Subject: Biology
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