Polyploid species are least common in
a. flowering plants.
b. mollusks.
c. insects.
d. conifers.
e. mammals.
Answer: e
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Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because _____
A) sterilized soil kills the root hairs as they emerge from the seedling B) the normal symbiotic fungi are not present in the sterilized soil C) sterilization removes essential nutrients from the soil D) water and mineral uptake is slower when mycorrhizae are present
__________ is one form of learning that happens only during a sensitive period early in life. Fill in the blank(s) with the appropriate word(s)
An individual has been diagnosed with persistent proteinuria. This condition is due to damage in which one of the following regions of the nephron?
A) loop of Henle B) proximal tubule C) glomerular capsule D) distal tubule E) collecting duct
Rickettsiosis is caused by Rickettsia rickettsii, a pathogen that
A. produces powerful exotoxins. B. provokes a severe immune response. C. interferes with the host cell's Krebs cycle. D. infects the lining of blood vessels and leads to leaking of plasma into tissue. E. lyses the host's cells.