What is meant by the statement, ‘natural selection lacks foresight'?
What will be an ideal response?
ANS:
Will vary, but could include: Natural selection has no way of anticipating the future beyond reacting to the past, nor can it plan ahead by multiple steps. Selection favors steps that are immediately beneficial, not changes that might be useful sometime in the future. If a new structure is to arise by natural selection alone, every step must be favored.
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Traditionally, classification of fungi has been based on ____
a. DNA sequences b. body type c. mode of feeding
d. whether the fungus is a saprobe, parasite, or in a mutual symbiosis e. structures that release sexual spores
Smokers who have a heart attack are nearly four times as likely as nonsmokers to die from it.
a. true b. false
Which repair mechanism is an error-prone system that uses bypass polymerases to replicate short segments of daughter strands whose normal replication is blocked by lesions in template strand DNA?
What will be an ideal response?
The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. gases such as nitric oxide. B. acetylcholine. C. neuropeptides. D. amino acids. E. biogenic amines.