Biology Questions

Q:

Amino acids can be distinguished from one another by

A) type of bond between the R group and the rest of the molecule B) the number of R groups found on the amino acid molecules
C) the chemical properties of their R groups D) the chemical properties of the amino and carboxyl groups
 
Answer & Explanation Answer: C) the chemical properties of their R groups

Explanation:

Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid.

 

Depending on the nature of the side chain groups, three classes of aminoacids can e distinguished:

1. Amino acids with H ond donor and acceptor groups.

Histidine, lysine, aspartic acid, threonine,...

2. Amino acids with donor grups only.

Arginine, tryptophan and cysteine.

3. Amino acids with acceptor groups only.

Asparagine and glutamine.

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Q:

Cortisol is secreted by

A) Thyroid gland B) Pituitary gland
C) Adrenal gland D) Parathyroid gland
 
Answer & Explanation Answer: C) Adrenal gland

Explanation:
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Q:

Nissil granules occur in

A) Eosinophil B) Glial cell
C) Neuron D) Lymphocyte
 
Answer & Explanation Answer: C) Neuron

Explanation:
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Q:

In electro - magnetic radiation, which of the following has greater wave - length than visible light

A) Ultra -violet rays B) Infra - red rays
C) Cosmic rays D) x-rays
 
Answer & Explanation Answer: B) Infra - red rays

Explanation:
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Q:

Which structure is common to plant and animal cells?

A) Centriole B) Chloroplast
C) Central Vacuole D) Mitochondria
 
Answer & Explanation Answer: D) Mitochondria

Explanation:

Mitochondria are present in both plant and animal cells.

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Q:

Which type of simple sugar is found primarily in fruit?

A) Sucrose B) Fructose
C) Maltose D) Lactose
 
Answer & Explanation Answer: B) Fructose

Explanation:

The main simple sugar found in fruit is Fructose. Glucose is found naturally occurring in fruits and other plants. But fructose is sweeter than glucose and can give you more energy. That's why a piece of fruit in the morning will give you more energy than a cup of coffee!

 

Fructose is what gives most fruits that sweet flavor and in combination with the acids present in certain fruits can give a pleasantly tangy flavor.

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Q:

Sponges are most accurately described as

A) marine predators B) chemoautrophs
C) filter feeders D) freshwater scavengers
 
Answer & Explanation Answer: C) filter feeders

Explanation:
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Q:

The Mode of nutrition in which particulate food is devoured is 

A) holozoic B) holophytic
C) saprophytic D) Parasitic
 
Answer & Explanation Answer: A) holozoic

Explanation:

The feeding mechanism is of several types. If it is entirely plant-like (photosynthesis),it is called holophytic. It is entirely (holo) animal-like (zoic), that is devouring already existing food, it is called holozoic.

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