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 Biology Questions

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Q:

Which organelle is the control center of a cell?

A) Nucleus B) Cytoplasm
C) Cell membrane D) endoplasmic reticulum
 
Answer & Explanation Answer: A) Nucleus

Explanation:

Nucleus serves as the control center for cell metabolism and reproduction.

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Q:

Genes are made of 

A) Carbohydrates B) Proteins
C) Fats D) Nucleotides
 
Answer & Explanation Answer: D) Nucleotides

Explanation:

Genes: The DNA is the genetic material. The DNA is made of several nucleotides. A nucleotide means, one nitrogenous base one sugar molecule and a phosphate molecule. These Nucleotides occur in sequences and several nucleotides form one gene ( a functional gene is called a cistron)

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Q:

In which organ RBC are selectively destroyed/recycled by macrophages?

A) Kidney B) Pancreas
C) Spleen D) Liver
 
Answer & Explanation Answer: C) Spleen

Explanation:

Spleen is called as the graveyard of RBC Red Blood Cells where they are selectively destroyed/recycled by macrophages.

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Q:

Synapsis occurs during

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

Explanation:

Synapsis is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them.

Synapsis takes place during prophase I of meiosis.

It is also called as Syndesis.

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Q:

In a nucleosome, the DNA is wrapped around

A) histone octamer B) helix
C) double helix D) None of the above
 
Answer & Explanation Answer: A) histone octamer

Explanation:

In_a_nucleosome,_the_DNA_is_wrapped_around1542780589.jpg image

In a nucleosome, the DNA is wrapped around histone octamer.

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Q:

ATP is a compound that is synthesized when

A) digestive enzymes break amino acids into smaller pieces B) energy stored in nitrogen is released froming amino acids
C) energy is stored in chemical bonds is released during cellular respiration D) chemical bonds between carbon atoms are formed by during photo synthesis
 
Answer & Explanation Answer: C) energy is stored in chemical bonds is released during cellular respiration

Explanation:
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Q:

Closely stacked flattened sacs (plants only)

A) Vacuoles B) Lysosomes
C) Golgi apparatus D) None of the above
 
Answer & Explanation Answer: C) Golgi apparatus

Explanation:
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Q:

Which of the following organelle is known as the 'Power House' of the cell?

A) Golgi Bodies B) Ribosomes
C) Mitochondria D) None of these
 
Answer & Explanation Answer: C) Mitochondria

Explanation:

Mitochondria are known as 'Power House' of the cell because they produce energy in the form of ATP.

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