The most commonly occurring mutation in people with cystic fibrosis is a deletion of a single codon. This results in _____
A) a base-pair substitution
B) a frameshift mutation
C) a polypeptide missing an amino acid
D) a nonsense mutation
C
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When mature, the ovary is referred to as a(n) ____ that encloses the angiosperm seed
a. ovule
b. endosperm c. fruit d. carpel e. inflorescence
A challenge with scientific breakthroughs is that they are rarely accompanied by ________
a. the desire to continue researching them b. the discovery of the tools to study them c. the people interested in them d. the legislation necessary to support them e. the funding to continue the research
Many ribosome-inactivating proteins are not toxic to humans because _____
a. we have enzymes to detoxify them b. they are very rare in nature c. they are sequestered by white blood cells d. they are rapidly metabolized e. they do not cross cell membranes very well
In decomposition, fungi generally
A) extend hyphae to invade litter and excrete hypha. B) break down litter through shredding. C) consume microbivores on tissues. D) gain energy directly through photosynthesis.