In the human immune system, resistance to a particular foreign agent, based on repeated exposure to the agent, is known as

A) Acquired immunity
B) Innate immunity
C) Natural immunity
D) Nonspecific host resistance


Ans: A) Acquired immunity

Biology & Microbiology

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Metabolic rate can be measured indirectly by measuring consumption of what substance?

A. water B. carbon dioxide C. oxygen D. insulin E. None of these answers are correct.

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If a plant is placed on its side, cells on the lower side of the stem will respond to gravity and elongate, making the stem turn so that it continues to grow downward.

Answer the following statement true (T) or false (F)

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Why does DNA replication have to be semidiscontinuous in order to be bidirectional?

What will be an ideal response?

Biology & Microbiology

Which of the following is true about retrotransposons?

A) Retrotransposons rely on an RNA intermediate to insert into a new part of the genome. B) Retrotransposons do not require an RNA intermediate. C) Retrotransposons can use a "cut-and-paste" strategy. D) Retrotransposons can use a "copy-and-paste" strategy. E) Retrotransposons never remain in their original location.

Biology & Microbiology