Allopatric speciation is more likely to occur when an isolated population __________.
a. is small and exposed to different selection pressures in its new habitat
b. is large and thus has more genetic variation
c. is reintroduced to its original homeland
d. inhabits an island close to the mainland
e. All of the listed responses contribute to allopatric speciation.
Answer: a. is small and exposed to different selection pressures in its new habitat
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If a fern gametophyte has both male and female gametangia on the same plant, then it _____
A) belongs to a species that is homosporous B) must be diploid C) has lost the need for a sporophyte generation D) has antheridia and archegonia combined into a single sex organ E) is actually not a fern, because fern gametophytes are always either male or female
What was a main factor in why Sir Alistair Hardy wanted to study the Antarctic seas? a. To study the evolution of whales for science
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Accessory pigments of _____ allow them to carry out photosynthesis at greater depths than other algae
a. euglenoids c. brown algae b. green algae d. red algae
Which statement below is an accurate description of receptor-mediated dimerization?
a) Ligands act as allosteric inhibitors that turn off the ability of their receptors to form dimers. b) Ligands act as bridging factors that allow the receptors to dimerize. c) Ligands act as allosteric regulators that turn off the ability of their receptors to form dimers. d) Ligands act as allosteric regulators that turn on the ability of their receptors to form dimers. e) Ligands act as allosteric inhibitors that turn on the ability of their receptors to form dimers