The antimicrobial action of artemisinin is not well understood but this chemical appears to
A. raise the internal pH, clump the plasmodial pigment, and intercalate into plasmodial DNA.
B. form reactive oxygen intermediates inside Plasmodium-infected red blood cells.
C. inhibit heme polymerase, an enzyme that converts toxic heme into nontoxic hemazoin.
D. swell the Plasmodium falciparum food vacuoles.
Answer: B
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What important feature(s) of noncovalent bonds makes them so important to life?
A. They are strong bonds that hold atoms together tightly in cells. B. They are weak in a cellular environment so they can be made, broken, and reformed easily. C. They can only occur in cells. D. Both a & c. E. Both b & c.
Character displacement makes competing species less similar, which facilitates __________. Fill in the blank(s) with the appropriate word(s)
The fruit produced by angiosperms is an evolutionary adaptation that most often
A. nourishes the seeds within the fruit on ripening B. aids in seed dispersal C. attracts pollinators D. inhibits seed germination until favorable environmental conditions occur E. provides an energy source for the plant egg cell prior to fertilization
When comparing prophase I of meiosis with prophase of mitosis, which of the following occurs only in meiosis?
A) The chromosomes condense. B) Tetrads form. C) The nuclear envelope disassembles. D) A spindle forms. E) Each chromosome is composed of two chromatids