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Q:

Because of base pairing in DNA, the percentage of

A) thymine molecules in DNA is about equal to the percentage of adenine molecules B) cytosine molecules in DNA is much greater than the percentage of guanine molecules
C) adenine molecules in DNA is about equal to the percentage of guanine molecules D) adenine molecules in DNA is much greater than the percentage of thymine molecules
 
Answer & Explanation Answer: A) thymine molecules in DNA is about equal to the percentage of adenine molecules

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Q:

_____ often referred to as a shock treatment, is a psychiatric treatment in which seizures are electrically induced in patients to provide relief from psychiatric illnesses.

 

A) Electromyography (EMG) B) Electrocardiogram (ECG)
C) Electroencephalography (EEG) D) Electroconvulsive therapy (ECT)
 
Answer & Explanation Answer: D) Electroconvulsive therapy (ECT)

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Q:

Yellow fever is mainly transmitted among humans by

A) Female mosquito bite B) Male mosquito bite
C) Water D) Air
 
Answer & Explanation Answer: A) Female mosquito bite

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Q:

Which three processes are methods of genetic recombination?

A) independent assortment B) Crossing over
C) fertilization D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Genetic recombination is a complex process that involves alignment of two homologous DNA strands, precise breakage of each strand, equal exchange of DNA segments between the two strands, and sealing of the resultant recombined DNA molecules through the action of enzymes called ligases.

Crossing over, independent assortment and fertilization are methods of genetic recombination.

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Q:

Which of the following is not regarded as helpful to compost?

A) Egg shells B) Sawdust
C) Tea-bags D) Fish bones
 
Answer & Explanation Answer: D) Fish bones

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Q:

Which  one  of  the  following  with  regard  to Aridisol,  one  of  the  soil  orders,  is not correct?

A) Lack  of  water  for  plants during  most part of the years B) High organic matter
C) Large  accumulation  of  carbonates  at depth D) Absence of deep wide cracks
 
Answer & Explanation Answer: B) High organic matter

Explanation:

All  are  correct  except  B  as  Aridisol is just like sand like soil as in Arid region  e.g.  In  Rajasthan,  so  there will be very less amount of organic matter.

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Q:

What is a tissue?

A) Cells which are similar in origin, but dissimilar in form and function B) Cells which are dissimilar in origin, but are similar in form and function
C) Cells which are dissimilar in origin, form and function D) Cells which are similar in origin, form and function
 
Answer & Explanation Answer: D) Cells which are similar in origin, form and function

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Q:

Hybrid zones provide an opportunity to investigate

A) Reproductive isolation B) Speciation
C) Both 1 & 2 D) None
 
Answer & Explanation Answer: C) Both 1 & 2

Explanation:

Hybrid zones are geographical areas where two interbreeding groups of genetically unique organisms meet. Hybrid zones provide an opportunity to investigate Reproductive isolation and Speciation.

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