To get cancer, you usually need ____ mutation(s) in a single cell.

A. just 1
B. 4 or more
C. 10 or more
D. 100 or more


Ans: B. 4 or more

Biology & Microbiology

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Each adenine-thymine base pair has ________ hydrogen bonds, while each guanine-cytosine base pair has ________ hydrogen bonds

A) two / one B) two / three C) four / three D) three / two

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Which wavelengths are absorbed by chloroplasts during photosynthesis?

a) green b) yellow c) orange d) All of the above are correct. e) Only b) and c) are correct.

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Most nosocomial infections of the urinary tract are caused by

A) Escherichia coli. B) Enterococcus. C) Proteus. D) Klebsiella. E) Pseudomonas.

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Which organisms acquire carbon for organic molecules from other organisms and use chemical compounds as a source of energy?

A. Photoautotrophs B. Chemoautotrophs C. Chemoheterotrophs D. Photoheterotrophs

Biology & Microbiology