The main reason sodium and potassium ions CANNOT easily diffuse through plasma membranes is
A. these are large atoms and size prevents their diffusion through membranes.
B. they have a high solubility in lipids.
C. they have a low solubility in lipids.
D. they have a high solubility in water.
E. they have both a high solubility in water and a low solubility in lipids.
E. they have both a high solubility in water and a low solubility in lipids.
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Which of the following nucleotide sequences represents the complement to the DNA strand
5? ? AGATCCG- 3?? a. 5? ? AGATCCG- 3? b. 3? ? AGATCCG- 5? c. 5? ? CTCGAAT- 3? d. 3? ? CTCGAAT- 5? e. 3? ? TCTAGGC- 5?
Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic drift, gene flow,
and natural selection What will be an ideal response?
The Golgi apparatus packages materials into ________ for transport or export
A) nucleoli B) organelles C) vesicles D) plastids E) vacuoles
Which of these structures most closely resembles a vertebrate nephron?
A) Protonephridium B) Malpighian tubule C) Nephrostome D) Flame cell E) Nephridium