A virologist wants to observe the three-dimensional surface features of virus particles she is studying. Which of the following microscopes would be most useful for her observations?
A) differential interference contrast
B) atomic force
C) scanning electron
D) transmission electron
E) atomic force or scanning electron
E
Bloom's Taxonomy: Application
Section: Microscopy
Learning Outcome: 4.9, 4.11
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In the spring before the leaves come out, maple trees are often tapped to collect sap to make syrup. The sugars were stored in the wood of the tree as starch and then released as temperatures rise above freezing in late winter. The resulting sucrose is released into the vessels that transport water. Which of the following would a person tap to collect sap from a maple tree?
A. phloem B. collenchyma tissue C. xylem D. parenchyma tissue E. roots
During this phase of the cell cycle the nuclear membrane reforms around the chromosomes:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
The ultimate electron acceptor in aerobic respiration is ____
a. NAD+ b. CO2 c. ADP d. NADP+ e. O2
A free nucleotide has a five carbon sugar (deoxyribose), __________ phosphate groups, and one of
four nitrogen-containing bases. Fill in the blank(s) with the appropriate word(s).