Which of the following is correct about polio?
A. The Sabin vaccine is preferred over the Salk vaccine in the U.S. today.
B. The disease is spread by the respiratory route.
C. The oral polio vaccine (OPV) is not responsible for causing any polio.
D. The virus multiplies in the mucosa of the intestines and is shed in feces.
E. The disease is still affecting millions of people worldwide, mainly in Africa and India.
Answer: D
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For filtration to take place through the fenestrated capillaries of the renal corpuscle, _____
A) the concentration of ions must be greater in the capillaries (the glomerulus) than in the renal tubule B) there must be a greater pressure inside the glomerulus than in the renal tubules C) there must be a larger concentration of proteins in the renal tubule than in the glomerulus D) there must be more than one capillary bed in the renal corpuscle
One of the most critical adaptations of the reptiles in relation to their life on land is the evolution of the
A. amniotic egg. B. allantois egg. C. chorionic egg. D. diploid egg. E. swim bladder.
The illustration shows natural asexual plant reproduction from a runner via budding. Which form of artificial reproduction most closely resembles the process shown in this illustration?
a. cutting
b. grafting
c. layering
d. micropropagation
Which of the following is a strand of RNA that lacks a capsid and causes plant diseases?
a) retrovirus b) viroid c) prion d) papillomavirus e) picornavirus