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 Biology Questions

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Q:

Select the correct statement about active and passive immunity.

A) A vaccination is an example of the introduction of passive immunity into the body B) Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
C) Immunological memory is established by passive immunization D) The antibodies utilized in active immunity are acquired from another organism
 
Answer & Explanation Answer: B) Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies

Explanation:
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2 2078
Q:

Gastrulation is the process that directly forms the

A) Ectoderm B) Endoderm
C) Mesoderm D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Gastrulation rearranges the cells of the blastula and ultimately forms the three germ layers of the embryo. The primary layers that will form all of the major body and organ systems of the organism, these germ layers include the ectoderm, mesoderm, and endoderm.

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1 2076
Q:

Which is a difference between proteins and carbohydrates and fats?

A) Proteins are composed of monomers; carbohydrates and fats are not. B) Excess carbohydrates and fats are stored; excess proteins are not.
C) Proteins are macromolecules; carbohydrates and fats are not. D) Carbohydrates and fats contain carbon, hydrogen, and oxygen; proteins do not.
 
Answer & Explanation Answer: B) Excess carbohydrates and fats are stored; excess proteins are not.

Explanation:

All proteins, carbohydrates and fats are macronutrients that we need to make living. They contribute to 90% of the dry weight of our diet. 

 

From the given options, Excess carbohydrates and fats are stored; excess proteins are not.

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4 2074
Q:

What is the average Life span of RBC?

A) 120 days B) 99 days
C) 101 days D) 111 days
 
Answer & Explanation Answer: A) 120 days

Explanation:

The average Life span of RBC is 120 days.

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2 2070
Q:

Which statement concerning the diagnosis of ADHD is true?

A) Boys are more likely to be diagnosed with ADHD than girls B) Most children "outgrow" symptoms of ADHD
C) About 20 percent of school-age children are diagnosed with ADHD D) Racial minority status is a good predictor of being diagnosed with ADHD
 
Answer & Explanation Answer: A) Boys are more likely to be diagnosed with ADHD than girls

Explanation:
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3 2065
Q:

Protists and bacteria are grouped into different domains because

A) protists have a membrane-bounded nucleus, which bacterial cells lack. B) protists eat bacteria
C) bacteria decompose protists D) protists are photosynthetic
 
Answer & Explanation Answer: A) protists have a membrane-bounded nucleus, which bacterial cells lack.

Explanation:
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1 2058
Q:

Bacteria and archaea are similar in which of the following?

A) Plasma membrane ester linkage B) Possessing prokaryotic cells
C) Peptidoglycan cell walls D) Methionine as the start signal for protein synthesis
 
Answer & Explanation Answer: B) Possessing prokaryotic cells

Explanation:

Bacteria and archaea are similar in possessing prokaryotic cells.

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2 2058
Q:

Example of a single celled organism

A) Algae B) Amaeba
C) Paramaecium D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Single selled organisms are also known as Unicellular organisms in which they have only one cell.

Examples are :: Fungi, Algae, Amaeba, Paramaecium,...

 

Hence, all the above given options are single selled organisms.

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3 2050