Jonas Salk developed a(n) (attenuated/inactivated/subunit) polio vaccine in 1955
What will be an ideal response?
inactivated
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A human female with only one X chromosome is said to have a condition called
A. X chromosome inactivation. B. Angelman syndrome. C. Turner syndrome. D. Klinefelter syndrome. E. Down syndrome.
If the death rate of a population exceeds the birth rate of a population, ____
a. the growth rate will remain static b. the population will grow c. the environment will become overexploited d. an exponential growth curve will result e. the population will decrease in size
Four of the five enzymes listed below digest the
same class of foods. Select the exception. a. aminopeptidase b. pepsin c. amylase d. trypsin e. chymotrypsin
These organisms have pharyngeal gill slits and a dorsal hollow nerve cord at some time in their development.
(A) Echinoderms (B) Annelids (C) Arthropods (D) Cnidarians (coelenterates) (E) Chordates