The KD or dissociation constant between a receptor and its hormone/ligand is
A. a measure of the binding affinity the receptor has for the hormone.
B. the hormone concentration where half the receptors are bound to hormone.
C. the hormone concentration where all of the receptors are bound to hormone.
D. both a measure of the binding affinity the receptor has for the hormone and the hormone concentration where half the receptors are bound to hormone.
E. both a measure of the binding affinity the receptor has for the hormone and the hormone concentration where all the receptors are bound to hormone.
D. both a measure of the binding affinity the receptor has for the hormone and the hormone concentration where half the receptors are bound to hormone.
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Gene duplications may be caused by
A. the crossing over of misaligned chromosomes B. deletion of important genetic information. C. reciprocal translocations. D. position effect. E. None of the answers are correct
What is the function of the nucleolus in the cell?
a. It is the site of DNA synthesis. b. It is the site of ribosomal RNA synthesis. c. It is the site of ATP synthesis. d. It is where worn-out DNA molecules are disassembled.
Aerobic respiration evolved in
a. some bacteria. b. some archea. c. animals. d. mitochondria. e. in some bacteria and some archea.
During fermentation, ATP is made primarily via
a. photophosphorylation. b. chemolithotrophy. c. oxidative phosphorylation. d. substrate-level phosphorylation.