When the concentration of a ligand is equal to the KD which of the following is true?
A. All of the ligands are bound to receptors.
B. All of the receptors are bound to ligands.
C. Half of the receptors are bound to ligands.
D. Half of the ligands are bound to receptors.
E. All of the ligands and receptors are bound to each other.
Answer: C
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Which of the following is a correct comparison between RNA polymerase holoenzyme that functions in transcription and the primase enzyme that functions in DNA replication?
A. Both enzymes synthesize DNA. B. Both enzymes are composed of RNA. C. Both enzymes synthesize RNA. D. Both enzymes are bound by sigma factor.
Color blindness is an X-linked trait in humans. If a color-blind woman marries a man with normal
vision, the children will be a. all color-blind daughters, but normal sons. b. all color-blind sons, but carrier daughters. c. all normal sons, but carrier daughters. d. all color-blind children. e. all normal children.
Which of the following is incorrectly paired with its structure and function?
a. sclerenchyma supporting cells with thick secondary walls b. periderm protective coat of woody stems and roots c. pericycle waterproof ring of cells surrounding the central stele in roots d. mesophyll parenchyma cells functioning in photosynthesis in leaves e. ground meristem primary meristem that produces the ground tissue system
Larvae and eggs are developmental forms of
A. fungi. B. protozoa. C. helminths. D. algae.