The uncondensed length of human DNA found in chromosomes is _______, whereas a typical cell is 10 µm in length.
a. 5 µm
b. 2 µm
c. 2 meters
d. 20 meters
e. 2.54 inches
Ans: c. 2 meters
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Biochemical systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, lock and key D. post-zygotic, temporal separation E. post-zygotic, ecological separation
Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A. guanine B. cytosine C. thymine D. uracil E. adenine
In a P1 cross involving incomplete dominance, ____
a. the dominant phenotype is expressed in the F1 b. the recessive phenotype is expressed in the F1 c. Mendelian inheritance does not apply d. the phenotypic ratio and genotypic ratio in the F1 are identical e. heterozygotes will express the parental phenotype
A baseball player leaping for a baseball and a cricket jumping away from a frog are both using ________. I) sensory receptors II) the central nervous system III) a muscle system
A) I only B) II only C) III only D) I, II, and III