The primary ions that contribute to the salinity of ocean waters are
A) calcium and sodium.
B) sodium and chloride.
C) sodium and carbonate.
D) calcium and chloride.
B
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Which of the following correctly describes the reproduction of males in Daphnia?
A) Daphnia males are produced asexually from unfertilized eggs. B) Daphnia males are produced sexually through fertilization of eggs but are sterile from birth. C) Daphnia males are produced from a pseudo-sexual union of two eggs. D) Daphnia males are produced asexually but are sterile from birth.
Which gas or gases bind to hemoglobin more strongly than oxygen?
a. carbon monoxide only b. carbon dioxide only c. nitrogen only d. both carbon dioxide and carbon monoxide e. both carbon dioxide and nitrogen
The transporter indicated by the letter "A" in the above figure represents a(n) ____
a. active Br transporter b. sodium-potassium cotransporter c. passive potassium transporter d. calcium-phosphorus transporter e. sodium-calcium transporter
Chromatids are
a. attached at the centriole. b. a pair of chromosomes, one from the mother and one from the father. c. attached at their centromeres. d. identical until crossing over occurs. e. attached at their centromeres and are identical until crossing over occurs.