Q:

Which of the following statements is most accurate regarding infection with parvovirus B19?

A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors	B) Parvovirus B19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
C) Parvovirus B19 can be diagnosed by detection of viral RNA using PCR or hybridization assays	D) Parvovirus B19 replicates in the host cell nucleus utilizing a virally encoded DNA polymerase to create a double- stranded DNA intermediate

Answer & Explanation Answer: A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors

Explanation:

Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors.

a. Parvovirus B19 binds preferentially to the erythrocyte blood group P antigen on erythroid precursor cells.

Answers B, C, D are incorrect:

b. after entry the single-stranded viral DNA genome is transported to the cell nucleus where the host DNA polymerase synthesizes the complimentary DNA strand.

c. Parvovirus B19 infection can be diagnosed by direct detection of viral DNA not RNA.

d. the fetus of a seropositive mother is protected from infection by maternal circulating antibodies.

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Q:

The primary goal of conservation biology is to

A) counter the loss of biodiversity	B) estimate the total number of species that exist
C) integrate human culture back into nature	D) catalogue species

Answer & Explanation Answer: A) counter the loss of biodiversity

Explanation:

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Q:

The process of depositing a layer of zinc on iron is called ___________

A) Galvanisation	B) Crystallisation
C) Rusting	D) Baking

Answer & Explanation Answer: A) Galvanisation

Explanation:

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Filed Under: Chemistry
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Q:

The land mass of India has an area of ______ million square km.

A) 1.28	B) 2.28
C) 3.28	D) 4.28

Answer & Explanation Answer: C) 3.28

Explanation:

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Q:

When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?

A) 5.33 N	B) 4.33 N
C) 6.33 N	D) 3.33 N

Answer & Explanation Answer: A) 5.33 N

Explanation:

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Filed Under: Physics
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Q:

Every hot object emits _________________

A) X - rays	B) Visible light
C) Infrared rays	D) Ultraviolet rays

Answer & Explanation Answer: C) Infrared rays

Explanation:

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Filed Under: Physics
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Q:

Is cholesterol Hydrophobic or Hydrophilic?

A) Hydrophobic	B) Hydrophilic
C) Both A & B	D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:

Cholesterol is referred as an amphipathic molecule, that it contains its hydrophilic and hydrophobic parts.

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Filed Under: General Science
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Q:

Supreme Court has banned the sale of BS-III vehicles from _____.

A) October 2, 2017	B) May 1, 2017
C) April 1, 2017	D) June 1, 2017

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