Which of the following is an indirect cell-counting method?
A) Coulter counter
B) turbidity measurement
C) microscopic count
D) viable plate count
E) flow cytometer
Answer: B
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Water has an important stabilizing effect on temperature in living organisms and their environments because as water absorbs heat, much of the energy is used to ____ instead of raising the temperature
a. create hydrogen bonds b. create covalent bonds c. break surface tension d. break hydrogen bonds e. create hydration layers
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade of effects. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are realeased in different concentrations.
A virus is made up all of the following except:
A. Nucleic Acid B .Protein C. Capsids D. Ribosomes
If a scientist were studying the role of different proteins in the regulation of insulin secretion from a pancreatic cell, they would be studying
A. both proteomics and cell biology. B. cell biology. C. both genomics and proteomics. D. genomics. E. proteomics.