Bacteria stain as gram-positive or gram-negative because of differences in the cell
A) wall.
B) cytoplasm.
C) nucleus.
D) chromosome.
Answer: A
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Water flows into the source end of a sieve tube because _____
A) sucrose has diffused into the sieve tube, making it hypotonic B) sucrose has been actively transported into the sieve tube, making it hypertonic C) water pressure outside the sieve tube forces in water D) the companion cell of a sieve tube actively pumps in water E) sucrose has been transported out of the sieve tube by active transport
If you examined a cross section of a woody stem under the microscope and located the vascular cambium, the tissues on the inside of the vascular cambium ring (towards the center of the stem) would be
A. xylem (primary and secondary). B. xylem (only primary). C. phloem (primary and secondary). D. phloem (only secondary). E. phelloderm. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the different tissues in a woody stem? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
During an action potential, sodium ions
A. rush out of the cell, switching the potential to +35 mV. B. rush into the cell, switching the potential to ?70 mV. C. rush into the cell, switching the potential to +35 mV. D. rush out of the cell, switching the potential to ?70 mV. E. rapidly move in and out of different parts of the neuron, oscillating potential between ?50 and +35 mV.
Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9 + 2 pattern. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves
Which question would be most important for one interested in the day-to-day survival of individual diatoms? A) How do diatoms get transported from one location on the water's surface layers to another location on the surface? B) How do diatoms with their glasslike valves keep from sinking into poorly lit waters? C) How do diatoms with their glasslike valves avoid being shattered by the action of waves? D) How do diatom sperm cells locate diatom egg cells?