In terms of number of species, the most successful terrestrial vertebrates that invaded the air are
A. birds.
B. insects.
C. flying monkeys.
D. bats.
E. pterosaurs.
Answer: A
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A researcher wants to clone a specific gene of interest. Why would he/she choose a viral vector for introducing the gene of interest into a host cell?
A. A viral vector contains its own metabolic machinery and does not affect the host cell. B. A viral vector can infect living cells and take control of the host cell's metabolic machinery. C. A viral vector is nonliving. D. A viral vector contains circular DNA, thus it is easier to insert the gene of interest. E. None of the choices are correct.
Cri-du-Chat syndrome is caused by a
A) reciprocal translocation between chromosomes 2 and 20. B) paracentric inversion of chromosome 21. C) deletion of part of chromosome 5. D) non-reciprocal translocation between chromosomes 14 and 21.
Which chordate has a four-chambered heart, no bladder, no teeth, and lack of a penis in the males?
a. a bird b. a crocodile c. a bat d. a frog e. a shark
Lipophilic hormones are transported in blood ________ and bind to receptors located ________.
Fill in the blank(s) with the appropriate word(s).