Most plant cells don't contain centrioles.
Indicate whether the statement is true or false.
Answer: True.
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Vitamin ____ is water soluble
a. A b. C c. D d. E e. K
Why don't recessive alleles that cause severe disorders disappear from human populations?
a. new alleles can arise by mutation. b. in heterozygotes, the dominant allele suppresses the recessive one but does not eliminate its presence. c. in heterozygotes, although the trait associated with the recessive allele is not demonstrated, the allele may be passed on to offspring. d. some recessive traits are not lethal nor do they interfere with reproduction. e. all of these.
Which process refers to dramatic phenotypic changes that sometimes occur in evolution, such as the appearance of
feathered wings during the evolution of birds? a. gradualism b. allopolyploidy c. macroevolution d. paedomorphosis e. microevolution
Sporulation generally occurs under which of the following circumstances?
A) when conditions are unfavorable or there are insufficient nutrients B) when microbes are exposed to a new, favorable environment C) when microbes are under little stress and can become dormant D) when resources become highly abundant