The west coast of Africa and South America in the tropics do not support corals. Which of the following would likely prevent coral growth in these areas?
a. cool northern flowing currents
b. cool upwelling water
c. depth of 25 meters
d. both a and b
D
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Hydrophobic is _______________.
a. acidic b. basic c. neutral d. both acidic and basic
Red-green color blindness is more common in males than females because
A) the red pigment gene is on the X chromosome, the green is on an autosome. B) the green pigment gene is on the X chromosome, the red is on an autosome. C) the rhodopsin gene is on the X chromosome. D) both the red and the green pigment genes are on the X chromosome. E) both the red and the green pigment genes are on an autosome.
Embryonic stem cells come from embryos specifically made for research.
Answer the following statement true (T) or false (F)
Which of the following are mechanisms to prevent polyspermy? (Check all that apply.)A) Altering the composition of the exterior egg coatB) Change in the membrane potential of the eggC) Cortical granule enzymes remove sperm receptors from egg.D) Special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one.E) Toxic molecules exit the egg to attack the extra sperm.F) Vitelline envelopes lift off the surface of egg.
What will be an ideal response?