Antibodies are classified as
a. nucleoproteins.
b. immunoglobulins.
c. polysaccharides.
d. steroids.
e. lipids.
Answer: b
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Which type of selection is occurring with the ?-globin gene?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. A. stabilizing B. directional C. disruptive D. balanced E. negative
The part of a flowering plant that becomes the fruit is the ________
a. ovule b. embryo sporophyte c. zygote d. ovary
Which of the following best describes the addition of nucleotides to a growing DNA chain?
A) A nucleotide triphosphate is added to the 5' end of the DNA, releasing a molecule of pyrophosphate. B) A nucleotide triphosphate is added to the 3' end of the DNA, releasing a molecule of pyrophosphate. C) A nucleotide diphosphate is added to the 5' end of the DNA, releasing a molecule of phosphate. D) A nucleotide diphosphate is added to the 3' end of the DNA, releasing a molecule of phosphate. E) A nucleotide monophosphate is added to the 5' end of the DNA.
What is the role of the fungus in a mycorrhizal association?
A) contribution to photosynthesis B) absorption of water, phosphate, and other minerals C) secretion of growth factors D) release of water