When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria try to pump the antibiotic out of their cells. Which of the following mechanisms is most likely used by the Streptococcus pneumoniae to pump the antibiotic out of their cells?
A. active transport
B. diffusion
C. facilitated diffusion
D. osmosis
A. active transport
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The photo shows the microscopic appearance of maple wood. Using your knowledge of the woody stem section, identify cell type a and the “line” of cells at b. (Note: The outside of the tree from which this section was taken is shown in the photo that accompanies question 8.)
What will be an ideal response?
The stage of the Plasmodium parasite that is transmitted to humans by the bite of a mosquito is the ________
a. merozoite b. gametocyte c. sporozoite d. zygote
Genes that affect the __________ system often affect
behavior. Fill in the blank(s) with the appropriate word(s).
A purine or pyrimidine that differs in chemical structure from a purine or pyrimidine normally found
in DNA or RNA is called a _____________. Fill in the blank(s) with the appropriate word(s).