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 Biology Questions

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Q:

The first formed primary xylem elements are called ___________.

A) Metaxylem B) Protoxylem
C) Xylem fibres D) Xylem parenchyma
 
Answer & Explanation Answer: B) Protoxylem

Explanation:
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Q:

What happens at the synapse between two neurons?

A) electrical signals are converted into chemical B) chemical signals are converted into physical
C) physical signals are converted into chemical D) None of the above
 
Answer & Explanation Answer: A) electrical signals are converted into chemical

Explanation:

At the synapse between two neurons, electrical signals are converted into chemical signals. A synapse is the gap between the two neurons.

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Q:

Study of Life in outer space is known as

A) Endobiology B) Neobiology
C) Exobiology D) Intrabiology
 
Answer & Explanation Answer: C) Exobiology

Explanation:

Study of Life in outer space or search of life external to Earth is known as Exobiology.

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Q:

The term facultative anaerobe refers to an organism that

A) Uses oxygen or grows without oxygen. B) Requires less oxygen than is present in air.
C) Prefers to grow without oxygen. D) Is killed by oxygen.
 
Answer & Explanation Answer: A) Uses oxygen or grows without oxygen.

Explanation:

The term facultative anaerobe refers to an organism that which uses oxygen when it is present or grows without oxygen when it is not there.

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Q:

Which statements about viruses are true?

A) HIV contains reverse transcriptase. B) A retrovirus contains RNA.
C) Both A & B D) All RNA-containing viruses are retroviruses.
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The statements true about viruses are :

 

1. The capsid enters the host cell if the virus is enveloped.

2. Enveloped viruses bud from the host cell. 

3. HIV contains reverse transcriptase.

4. A retrovirus contains RNA.

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Q:

What molecule carries genetic information?

A) RNA B) DNA
C) Proteins D) Nucleotides
 
Answer & Explanation Answer: B) DNA

Explanation:

The nucleus of a cell contains chromosomes, which carry genetic information in a long molecule called DNA.

Genes are regions of DNA that carry the code to control a particular cell activity or the production of a particular protein.

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Q:

In Paramecium, the food is moved to a specific spot by the movement of ______ which cover the entire surface of the cell.

A) cilia B) villi
C) pseudopodia D) vacuole
 
Answer & Explanation Answer: A) cilia

Explanation:
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Q:

An example of a latent viral infection is

A) Influenza B) Mumps
C) Cold sores D) Smallpox
 
Answer & Explanation Answer: C) Cold sores

Explanation:
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