How many chromosomes are provided to a zygote from each gamete?
A) 23
B) 46
C) 46 pairs
D) none of the above
A
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While rock climbing, you encounter the plant shown in the photo on the right growing out of a crevice.
(a) Is this the sporophyte or the gametophyte? (b) What special name is given to the leaf of this plant?
Which of the following statements is true regarding respiration in birds? Choose all that
A. Bird lungs inflate due to negative pressure in the chest cavity. B. Bird lungs deflate due to negative pressure in the chest cavity. C. Oxygen enters the bloodstream via crosscurrent exchange. D. Oxygen enters the bloodstream via countercurrent exchange. E. Respiration depends on the movement of air through air sacs. F. Respiration depends on the movement of air through spiracles.
Refer to the accompanying figure. Which beetle phenotype has the highest probability of survival?
a. 1
b. 2
c. 3
d. 4
e. There is no difference in survival rate.
Which of the following statements concerning the Rh factor is CORRECT?
A) The Rh antigen is on white blood cells. B) Eighty-five percent of humans are Rh positive. C) Preexisting antibodies occur in 85% of the population. D) Rh antibodies are more abundant than the ABO antibodies. E) Eighty-five percent of the human population is Rh negative.