Which statement accurately describes the relationship between natural selection and sexual selection?
a. Sexual selection and natural selection are unrelated processes.
b. Unlike natural selection, sexual selection cannot result in fundamental change over geologic time.
c. Natural selection could be subdivided into viability selection and sexual se-lection.
d. Only natural selection is based on individual fitness.
C
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Each HIV particle possesses a ___________ on its surface, called gp120, that precisely binds to a protein, called CD4, that is found on the surfaces of the immune system cells called macrophages and T cells.
A. nucleic acid B. phospholipid C. polysaccharide D. glycolipid E. glycoprotein
Which of the following statements is (are) true
concerning promoters? a. They are short sequences in DNA. b. They are locations in DNA where regulatory proteins gather. c. They control transcription. d. They are associated with specific genes. e. All of these are true.
Describe one technique that can be used to generate multiple copies of a gene that is of interest to a researcher
What will be an ideal response?
The bacterium shown to be associated with the majority of gastric ulcers is
A) Streptococcus lactis. B) Staphylococcus aureus. C) Helicobacter pylori. D) Escherichia coli. E) Streptococcus pyogenes.