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
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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
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.
Most nosocomial infections of the urinary tract are caused by
A) Escherichia coli. B) Enterococcus. C) Proteus. D) Klebsiella. E) Pseudomonas.
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