Which of the following statements concerning calcium ions is FALSE?
a. They are involved in fertilization, blood clotting, and microtubule disassembly.
b. Their concentration in the cytosol rises when Ca2+ gates open in the ER.
c. Their concentration in the cytosol is usually higher than in the extracellular fluid.
d. They can act by themselves, without binding to calmodulin.
e. They can exert an effect after binding to calmodulin.
C
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The primary function of the integument of an ovule is to _____
A) protect against animal predation B) ensure double fertilization C) form a seed coat D) direct development of the endosperm E) produce hormones that ensure successful pollination
The origins of replication in eukaryotic chromosomes are spaced about every _______ base pairs
A. 100,000 B. 1000 C. 100 D. 10 E. 500
Evidence that all differentiated cells contain the organism's complete genome is provided by ____
a. comparing frog and sea urchin development b. observing that some cells remain totipotent c. observing that totipotent cells give rise to multipotent cells d. observing that multipotent cells give rise to pluripotent cells e. the successful cloning of a sheep, Dolly
Circulation in the above diagram functions primarily as a(n) ____
a. closed circulatory system b. open circulatory system c. semi-closed circulatory system d. system of exchange using capillaries e. continuous system of vessels