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 Biology Questions

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Q:

The energy in most ecosystems comes from

A) Water B) Carbon dioxide
C) Sun D) Soil
 
Answer & Explanation Answer: C) Sun

Explanation:

The energy in most ecosystems comes from sun light.

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Q:

Bacteria divide by

A) Binary Fission B) Spirilla
C) RNA D) Fusion
 
Answer & Explanation Answer: A) Binary Fission

Explanation:

Bacteria divided and reproduce by Binary fission. In this process, the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two replicates.

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Q:

Systems biology is mainly an attempt to

A) Understand the behavior of entire biological systems B) Speed up the technological application of scientific knowledge
C) Analyze genomes from different species. D) None of the above
 
Answer & Explanation Answer: A) Understand the behavior of entire biological systems

Explanation:

An approach to studying biology that aims to model the dynamic behavior of whole biological systems based on a study of the interactions among the system's parts.

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Q:

A protein is synthesized in the endoplasmic reticulum bound ribosomes and it targets to the inner thylakoid space of chloroplast. How many double-layered membrane layers it has to pass to reach its destination?

A) 2 B) 3
C) 4 D) 5
 
Answer & Explanation Answer: B) 3

Explanation:

There are 3 double-layered membrane layers, which the protein has to pass to reach its destination.

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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, poorly controlled stress and anger can lead to heart attacks and strokes.

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Q:

The hormone associated with aggression seems to be

A) Testosterone B) Adrenaline
C) Estrogen D) Peptone
 
Answer & Explanation Answer: A) Testosterone

Explanation:

Testosterone is the hormone which is associated with aggression.

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Q:

The hormone that stimulates heart beat is

A) Thyroxine B) Gastrin
C) Glycogen D) Dopamine
 
Answer & Explanation Answer: A) Thyroxine

Explanation:
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Q:

Which stage of cellular respiration produces the most ATP?

A) Glycolysis B) Kreb's cycle
C) Electron transport chain D) All the above
 
Answer & Explanation Answer: C) Electron transport chain

Explanation:

There are 3 stages in cellular respiration. They are:

1. Glycolysis

2. Kreb's cycle

3. Electron transport chain

 

Here, Glycolysis produces only 2 ATP whereas Kreb's cycle produces no ATP. Electron transport chain of the cellular respiration produces the maximum ATP.

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