Which one of the following is a signal that induces multicellularity of choanoflagellates?
A. the presence of predators in the
environment
B. the presence of the preferred prey/food
source in the environment
C. the developmental signal molecules that
induce differentiation
D. the cell migrations that take place in the
developmental phases of growth
B
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Anoxygenic phototrophs
A) may use a variety of electron donors for photosynthesis. B) are an ancient monophyletic group of bacteria. C) can be either autotrophic or heterotrophic. D) can be either autotrophic or heterotrophic and may use a variety of electron donors for photosynthesis.
Genetics is the branch of the biological sciences that deals with both heredity and variation
Indicate whether the statement is true or false
Natural sources of energy on the early Earth caused ____
a. spontaneous genetic mutations b. chemical bonds to break c. chemical bonds to form d. chemical bonds to break and form e. spontaneous genetic mutations and chemical bonds to break and form
Which of the following is not a form of genetic drift?
A) Founder effect B) Nonrandom mating C) Population bottleneck D) Heterozygote advantage E) All of these are forms of genetic drift.