Most marine invertebrates are osmoconformers. This means that
A. the osmolarity of their body fluids is the same as their seawater environment.
B. that their body fluids contain the exact same solutes in the same concentration as their cells.
C. the osmolarity of their body fluids is equal to that of the osmoregulators who inhabit the same environments.
D. the osmolarity of their body fluids fluctuates between hypertonic to hypotonic depending on the season and the tides.
E. that their body fluids contain the exact same solutes in the same concentration as their surroundings.
Answer: A
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A prophage is an early stage in the
A) lytic cycle. B) lysogenic cycle. C) development of an animal virus. D) folding of a prion.
Which one of the following statements about transport of nutrients in phloem is correct?
A) Solute particles are actively transported from phloem at the source. B) Companion cells control the rate and direction of movement of phloem sap. C) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed. D) A sink is the part of a plant where a particular solute is produced.
The high osmolarity of the renal medulla is maintained by all of the following EXCEPT _____
A) active transport of salt from the upper region of the ascending limb B) the spatial arrangement of juxtamedullary nephrons C) diffusion of urea from the collecting duct D) diffusion of salt from the descending limb of the loop of Henle
Which of the following is the best
representation of a testcross?
a. AA x aa b. Aa x aa c. AA x A? d. A? x aa e. AA x a?