If there are twenty centromeres in a cell, how many chromosomes are there?

a. 10
b. 20
c. 30
d. 40

Ans: b. 20

Biology & Microbiology

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Bioactive specialized compounds that function to protect plants from viral, fungal and bacterial pathogens are ____

a. systemins b. phytoalexins

c. PR proteins d. R genes e. heat-shock proteins

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Does Andrew have a reason to be concerned about developing Huntington's Disease?

a. Yes, absolutely. b. No, he has no reason to be concerned c. Perhaps, but the likelihood is remote. d. Not enough information is given

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When sperm and egg fuse, a ________ is formed.

Fill in the blank(s) with correct word

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