The primary function of centrioles in animal cells is ____
a. generation of flagella and cilia
b. spindle formation
c. to connect the two sister chromatids
d. to provide a point of attachment for spindle fibers on chromosomes
e. cell plate formation
A
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The process of gene expression includes two steps: __________ and __________. Fill in the blank(s) with the appropriate word(s)
Callaway and Aschehoug's study concluded that an invasive Eurasian grass species can outcompete native North American grasses through
A. faster seed germination. B. secretion of allelochemicals. C. anti-herbivore compounds. D. producing more viable seeds. E. producing seeds year-round.
According to the animation, which of the following makes mRNA from the information stored in a DNA template?
a. DNA polymerase b. tRNA c. Ribosomes d. RNA polymerase
Why might an HIV test be negative within the first two to three weeks of an HIV infection?
A. because there are no symptoms B. because there is no HIV in the blood C. because there are no opportunistic infections yet D. because the CD4 T-cell count is above 500 cells/mm3 E. because there are no detectable levels of HIV antibodies in the blood