Which of the following statements about water is correct?
A. Water is the most abundant molecule in living cells.
B. Water is a polar molecule.
C. Water has good solvent properties.
D. Water can drive biological processes such as the formation of cell membranes.
E. All of these statements about water are correct.
Answer: E
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A male inherits his X-linked allele from his mother.
Answer the following statement true (T) or false (F)
More than half a century ago, two cell biologists published details of their research involving isolated membrane vesicles from chloroplasts. Normally, the fluid inside these vesicles is near neutral
In an experiment, these membrane vesicles were soaked in an acidic solution (pH 4 ) until the inside of the vesicle also became pH 4. Based on the details provided in this scenario, by what mechanism could hydrogen ions have crossed the vesicle membrane, and what do you think happened at the molecular level? A) Active transport; hydrogen ions moved out of the vesicle with the help of ATP energy. B) Pinocytosis; water moved from outside the vesicle to inside. C) Facilitated diffusion; hydrogen ions moved into the vesicle through a channel protein. D) Simple diffusion; hydrogen ions moved into the vesicle through a channel protein. E) Osmosis; water moved from inside the vesicle to outside.
A patient complains of fever, severe muscle and joint pain, and a rash. The patient reports returning from a Caribbean vacation one week ago. Which of the following do you suspect?
A) Lassa fever B) dengue C) Hantavirus hemorrhagic fever D) typhus E) yellow fever
Agar is derived from
a. red algae. b. brown algae. c. green algae. d. all of the above.