Free Practice Questions for Competitive Exams, Interviews, Certifications

Q:

Most viruses that infect plants possess

A) single-stranded DNA	B) single-stranded RNA
C) double-stranded DNA and RNA	D) double-stranded RNA only

Answer & Explanation Answer: B) single-stranded RNA

Explanation:

Generally viruses that infect plants have single stranded RNA. Viruses infecting animals have double stranded RNA or DNA. Viruses which infect bacteria have double stranded DNA.

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Filed Under: Biology
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Q:

In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells

A) there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors	B) controlled cell divisionand over-production of genetic material occur
C) RNA is mutated and produced in less amount	D) DNA is mutated and produced in less amount

Answer & Explanation Answer: A) there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors

Explanation:

In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant.

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Filed Under: Biology
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Q:

AIDS is caused by the Human Immunodeficiency Virus (HIV). The transmission of HIV infection generally occurs through

A) eating contaminated food and water	B) transfusion of contaminated blood and blood products
C) inhaling polluted air	D) shaking hand with infected person

Answer & Explanation Answer: B) transfusion of contaminated blood and blood products

Explanation:

AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome. Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contaminated blood and blood products, (c) by sharing infected needles as in the case of intravenous drug abusers and (d) from infected mother to her child through placenta.

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Filed Under: Biology
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Q:

A sentence/a part of the sentence is underlined. Four alternatives are given to the underlined part which will improve the sentence. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement".

My mother teach me to be a good human being.

A) taught	B) thought
C) talked	D) No improvement

Answer & Explanation Answer: A) taught

Explanation:

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Filed Under: English
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Q:

A sentence/a part of the sentence is underlined. Four alternatives are given to the underlined part which will improve the sentence. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement".

Never such incidents have taken place on our campus.

A) have such incidents	B) such incidents will have
C) were such incidents	D) No improvement

Answer & Explanation Answer: A) have such incidents

Explanation:

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Filed Under: English
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Q:

A sentence/a part of the sentence is underlined. Four alternatives are given to the underlined part which will improve the sentence. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement".

If the room had been brighter, I would have been able to read for a while before bed time.

A) If the room was brighter	B) If the room are brighter
C) Had the room been brighter	D) No improvement

Answer & Explanation Answer: C) Had the room been brighter

Explanation:

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Q:

A sentence/a part of the sentence is underlined. Four alternatives are given to the underlined part which will improve the sentence. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement".

Sita was cooking in the kitchen when her husband was ringing the bell.

A) would have been ringing	B) had rung
C) rang	D) No improvement

Answer & Explanation Answer: C) rang

Explanation:

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Q:

A sentence/a part of the sentence is underlined. Four alternatives are given to the underlined part which will improve the sentence. Choose the correct alternative and click the button corresponding to it. In case no improvement is needed, click the button corresponding to "No improvement".

He enjoys to go on tours with his children.

A) to go for tours	B) going for tours
C) going on tours	D) No improvement

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