If you had a vial of natural killer cells, you would expect chemical tests to show the presence of what?
A. perforin
B. interleukin-1
C. interferon
D. antibodies
E. complement
Answer: A. perforin
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Fungi that do not reproduce sexually and have large asexual spores are
A. glomeromycota. B. basidiomycota. C. ascomycota. D. zygomycota. E. chytridiomycota.
In a wild-type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases)
What is the most likely explanation for this? A) There are introns in the DNA that were cut out of the mRNA. B) The mRNA was prematurely degraded. C) A mutation caused the formation of an extra stop codon in the gene. D) The first 800 bases of DNA are always cut out as it is transcribed into mRNA.
When populations become geographically separated for a period and then come back into contact, they __________ become different species.
a) always b) sometimes c) never
In the electron-transport chain in chloroplasts, ________-energy electrons are taken from __________
(a) high; H2O. (b) low; H2O. (c) high; NADPH. (d) low; NADPH.