Not only does smoking cause lung cancer, it also quadruples the risk of which one of the following types of cancer?
A) stomach
B) prostate
C) bladder
D) colon
E) brain
C
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Proteins that are encoded by the same gene but differ in structure and function are the product of alternative splicing in pre-mRNA processing. Such protein variants are termed
A) isoteins. B) heteromeric proteins. C) isozymes. D) protein isoforms. E) allelomorphs.
A proton ________ drives the protons out across the mitochondrial membrane into the intermembrane space.
Fill in the blank(s) with the appropriate word(s).
It is hypothesized that ________ associations may have helped plants colonize dry land
Fill in the blank(s) with correct word
What is nitrogen fixation?
A. the conversion of nitrate (NO3-) into nucleic acids B. the incorporation of ammonia (NH3) into amino acids C. the release of ammonia (NH4-) from decomposing organic material D. the conversion of atmospheric nitrogen (N2) into ammonia (NH3) E. the conversion of ammonia (NH3) into ammonium ion (NH4+)