73
Q:

From the following pairs, find the one which is correctly matched?

 

A) Scurvy- Thiamine B) Tuberculosis- ATS
C) Tetanus- BCG D) Malaria- Chloroquine

Answer:   D) Malaria- Chloroquine



Explanation:

Chloroquine is a medication used to prevent and to treat malaria.

Subject: Biology
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Q:

Which of the following is true of osmosis?

A) it is a type of diffusion B) movement is against water's concentration gradient
C) requires energy D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:
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2 1502
Q:

Factors that aid venous return include all except

A) pressure changes in the thorax B) urinary output
C) activity of skeletal muscles D) venous valves
 
Answer & Explanation Answer: B) urinary output

Explanation:
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4 1936
Q:

The two purines in DNA are

A) Adenine & Thymine B) Thymine & Uracil
C) Guanine & Uracil D) Adenine & Guanine
 
Answer & Explanation Answer: D) Adenine & Guanine

Explanation:

The purines are bases in the DNA. The two purines in DNA are Adenine and Guanine. These two purines forms hydrogen bonds with their complimentary pyrimidines such as Thymine and Cytosine to keep the two rails of the DNA molecule together.

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3 1848
Q:

Tubes that bifurcate from the windpipe

A) Bronchi B) pleura
C) Apex D) Adenoids
 
Answer & Explanation Answer: A) Bronchi

Explanation:

Tubes that bifurcate from the windpipe are called Bronchi.

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1 2008
Q:

Which of the following statements about DNA replication is true?

A) Single‑strand binding proteins stabilize the open conformation of the unwound DNA. B) Okazaki fragments are DNA fragments synthesized on the leading strand.
C) DNA polymerase adds dNTP monomers in the 3′-5′ direction. D) DNA gyrase unwinds the DNA double helix.
 
Answer & Explanation Answer: A) Single‑strand binding proteins stabilize the open conformation of the unwound DNA.

Explanation:
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1 1434
Q:

Which best describes a gene?

A) a segment of chromosomal DNA B) tightly coiled strands of DNA
C) different allele forms of a trait D) None of the above
 
Answer & Explanation Answer: A) a segment of chromosomal DNA

Explanation:

Gene is a hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism.

In short it is a piece or segment of chromosome.

 

Genes undergo mutation when their DNA sequence changes. 

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1 1875
Q:

Select the correct statement about the ureters.

A) The ureter is innervated by parasympathetic nerve endings only. B) Ureters contain sphincters at the entrance to the bladder to prevent the backflow of urine.
C) The epithelium is stratified squamous like the skin, which allows a great deal of stretch. D) The ureters are capable of peristalsis like that of the gastrointestinal tract.
 
Answer & Explanation Answer: D) The ureters are capable of peristalsis like that of the gastrointestinal tract.

Explanation:
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2 2064
Q:

During the process of protein synthesis, each trna carries one

A) amino acid B) nucleotide
C) fatty acid D) nucleic acis
 
Answer & Explanation Answer: A) amino acid

Explanation:

During protein synthesis process, each tRNA carries one aminoacid for protein synthesis to the ribosomes.

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1 1818