Biology Questions

Q:

Which of the following statements about enzymes is not true?

A) all enzymes have the same shape as their substrates B) enzymes are proteins
C) enzymes work best at a specified ph D) the shape of an enzyme allows it to do its job
 
Answer & Explanation Answer: A) all enzymes have the same shape as their substrates

Explanation:

All enzymes have the same shape as their substrates is the FALSE statement regarding enzymes.

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Q:

Which of the following statements about vitamins is true?

A) Vitamins have a small caloric value B) Vitamins can serve as an energy supply for the body if certain criteria are met
C) Like protein and some minerals, vitamins contribute to the structure of the body D) Vitamins are indispensable for the maintenance of optimal health
 
Answer & Explanation Answer: D) Vitamins are indispensable for the maintenance of optimal health

Explanation:

Vitamins are indispensable for the maintenance of optimal health is the only statement that is true about vitamins.

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Q:

Which organelles supply energy to the cell?

A) Mitochondria B) Cytoplasm
C) Ribosomes D) None of the above
 
Answer & Explanation Answer: A) Mitochondria

Explanation:

Mitochondria which is present in both plant and animal cells supplies energy to the cells and hence called as the powerhouse of the cell.

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Q:

The vitamin D deficiency disease in adults is known as

A) Hypovitaminosis D B) Avitaminosis
C) Scorbutus D) Petechiae
 
Answer & Explanation Answer: A) Hypovitaminosis D

Explanation:

Vitamin D also known as Sunshine vitamin is produced in the body when our skin is exposed to sunlight. Its deficiency leads to a disease in which bone tissue doesn't properly mineralize leading to soft bones. The vitamin D deficiency disease in adults is known as Hypovitaminosis D.

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Q:

In what chief capacity does vitamin k function?

A) raise plasma calcium B) blood clot
C) produce rhodopsin D) bone density
 
Answer & Explanation Answer: B) blood clot

Explanation:

The chief capacity of vitamin K is to help our blood clot so that we don't bleed too much.

Vitamin K is actually made up of two different types of vitamins, Vitamin K1 and Vitamin K2. They are both responsible for helping the blood to clot so that people do not bleed to death. Vitamin K1 can be consumed by eating leafy green vegetables, such as kale and spinach, as well as other vegetables, such as broccoli and collard greens. Meats, cheeses, and eggs can provide a great source of Vitamin K2.

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Q:

In a nucleosome, the DNA is wrapped around

A) ribosomes B) thymine dimer
C) histones D) polymerase
 
Answer & Explanation Answer: C) histones

Explanation:

in_a_nucleosome_the_dna_is_wrapped_around1559212136.png image

In a nucleosome, the DNA is wrapped around a protein called histones and area in between them.

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Q:

Blood flow to a tissue will increase if the

A) pH rises B) Level of carbon dioxide at the tissue increases
C) Vessels constrict D) Level of oxygen at the tissue increases
 
Answer & Explanation Answer: B) Level of carbon dioxide at the tissue increases

Explanation:

The movement of blood in the body is called blood flow. The blood flows through the vessels, tissues and organs. Blood flow to a tissue will increase if the level of carbon dioxide at the tissue increases.

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Q:

Which of the following is a characteristic of all angiosperms?

A) double internal fertilization B) ovules that are not contained within ovaries
C) complete reliance on wind as the pollinating agent D) free-living gametophytes
 
Answer & Explanation Answer: A) double internal fertilization

Explanation:

The flowering plants, also known as angiosperms, Angiospermae or Magnoliophyta, are the most diverse group of land plants. These are also seed producing plants like gymnosperms. In Angiosperms seeds are in flowers.

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