Which element is considered a macronutrient needed by plants?
A. Manganese
B. Iron
C. Copper
D. Potassium
E. Boron
Answer: D
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Morphological differences in European beaver and ____ contributed to Darwin's thoughts on reasons
for species differences.
a. South American nutria b. South American iguana c. extinct glyptodont d. nine banded armadillo e. South American beaver
The circles in “B” are
a. fragments of the main bacterial DNA. b. plasmids. c. cDNA molecules. d. DNA templates. e. none of these.
If the frequency of a recessive allele is 36 percent,
the frequency of the dominant allele is what percent? a. 5 b. 8 c. 25 d. 48 e. 64
A color-blind man and a woman with normal vision whose father was color blind have a son. Color blindness, in this
case, is caused by an X-linked recessive gene. If only the male offspring are considered, the probability that their son is color-blind is ____. a. 25 percent b. 50 percent c. 75 percent d. 100 percent e. 0 percent