Although most biologists believe that many species are becoming extinct each year because of the activities of humans, relatively few species actually appear on compiled lists of extinct species
What is one reason why so few species are listed as extinct? A) Many species are unknown to science and go extinct before they've been described.
B) There really aren't that many species that have become extinct.
C) Many species aren't listed because they aren't considered important.
D) Only extinctions that are naturally caused are listed.
A
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Which of the following is a challenge to the hypothesis that bats, which produce an unusually large number of sperm, increase the probability of conception when females engage in multiple matings?
I) Female bats can eject the sperm of certain males after mating. II) A female can actively choose which male mates with her last, thus increasing the odds of conception with that male's sperm. A) Only I is correct. B) Only II is correct. C) Both I and II are correct.
The net direction that an ion or molecule moves is
a. dependent upon the size of the molecule. b. unpredictable because movement is random. c. influenced by the temperature of the medium. d. influenced by the membranes in the vicinity. e. the result of concentration differences.
Which statement about endochondral bone development is true?
a. Ossification begins in the diaphysis and later occurs in the epiphyses. b. Bones develop from a noncartilage connective tissue scaffold. c. Most bones of the skull undergo endochondral bone development. d. Only the periosteum undergoes endochondral bone development. e. Osteoclasts are the bone-building cells of endochondral bone development.
A mutation in RTK receptor that allows the receptor to bind the ligand and pair with a wild-type receptor but blocks signal transduction is classified as a ________ mutation,
whereas a mutation that activates RTK pairing signal transduction even in the absence of ligand is classified as a ________ mutation. Fill in the blank with correct word.