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Q:

Some niacin is formed in the body from

A) Liver B) Skin
C) Appendix D) None of the above

Answer:   A) Liver



Explanation:

Niacin is the name for vitamin(B3).

 

Liver can produce small amount of niacin from tryptophan.

 

To produce 1 mg of niacin we require 60 mg of tryptophan.

Subject: Biology
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Q:

Which parts of the heart receive blood from the lungs?

A) Right ventricle B) Left Atrium
C) Left Ventricle D) Right ATrium
 
Answer & Explanation Answer: B) Left Atrium

Explanation:

The left atrium is the upper left chamber of the heart that receives blood from the pulmonary veins.

 

which_parts_of_the_heart_receive_blood_from_the_lungs1561113684.jpg image

 

The heart is responsible for circulating blood throughout the body. The heart is divided into four chambers. The upper chamber is known as the atrium while the lower chamber is referred to as the ventricle.

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Q:

What is the outcome when a cell undergoes meiosis?

A) Two haploid cells B) Four haploid cells
C) Two diploid cells D) Four diploid cells
 
Answer & Explanation Answer: B) Four haploid cells

Explanation:

When a cell undergoes meiosis process, it produces 4 haploid cells as a result.

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Q:

Pollen is produced by the process of

A) Mitosis B) Pollination
C) Meiosis D) Fertilization
 
Answer & Explanation Answer: A) Mitosis

Explanation:

Pollen is a male plant gamete. When microspores produced after meiosis process on microsporangia of male gametophyte undergo mitosis and forms pollen grains.

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Q:

A protein is being assembled when

A) RNA is being translated B) DNA is being translated
C) RNA is being transcribed D) DNA is being transcribed
 
Answer & Explanation Answer: A) RNA is being translated

Explanation:

A protein is being assembled when RNA is being translated. This process goes as, by the process of transcription first DNA is is converted to mRNA. And then by the process of translation this mRNA is converted to proteins.

=> DNA ----> mRNA ----> Proteins.

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Q:

Gametes are produced by the process of

A) Mitosis B) Meiosis
C) Both A & B D) None of the above
 
Answer & Explanation Answer: B) Meiosis

Explanation:

A gametes are haploid cells as they have only one set of chromosomes. Meiosis is a process of cellular reproduction in which both male and female gametes are formed. During meiosis, the DNA is only replicated or copied one time.

Gametes_are_produced_by_the_process_of1560944987.png image

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Q:

Which of the following cannot add fat to the body?

A) Vitamins B) Carbohydrates
C) Water D) Proteins
 
Answer & Explanation Answer: C) Water

Explanation:

A nutrient is a substance used by an organism to survive, grow, and reproduce. These are compounds in foods essential to life and health, providing us with energy.

There are two types of nutrients:

1. Organic Nutrients
2. Inorganic Nutrients

 

Carbohydrates (CHO), Lipids (fats), Proteins and Vitamins come under organic nutrients as they contain carbon. These can add fat to the body.

 

Minerals and Water come under inorganic nutrients as they lack in carbon. These cannot add fat to the body.

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Q:

Goosebumps are caused by contractions of the

A) Muscles B) Nerves
C) Bones D) All of the above
 
Answer & Explanation Answer: A) Muscles

Explanation:

Goosebumps are caused by the contraction of the tiny muscles attached to hair follicles. These muscles are arrectores pilorum muscles.

 

Goosebumps_are_caused_by_contractions_of_the1560862968.png image

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Q:

Mitochondrial DNA analysis is best suited for

A) analysis in which only a minute quantity of DNA material is available B) Forensic science analysis
C) analysis requiring greater discriminatory power than STR D) All of the above
 
Answer & Explanation Answer: B) Forensic science analysis

Explanation:

Mitochondrial DNA analysis is best suited for Forensic science analysis.

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