Which of the following is true of the isoelectric point of amino acids?
A) The isoelectric points of all amino acids are the same.
B) It is the pH at which an amino acid conducts electricity.
C) It is the pH at which an amino acid has equal numbers of positive and negative charges.
D) All of the above are true.
C
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Why is the light year a useful unit of measurement for astronomical distances?
What will be an ideal response?
Condensation nuclei are important in the atmosphere because
a. ?they provide most of the minerals found in water. b. ?they make it easier for condensation to occur in the atmosphere. c. ?they are the sole producers of smog. d. ?they filter out sunlight. e. ?they provide the only means we have of tracking wind motions.
The processes of surface water soaking into the soil to become groundwater is called:
A. Precipitation B. Runoff C. Transpiration D. Infiltration
What are some ways by which a slope can become oversteepened? How can oversteeping cause mass
wasting? What will be an ideal response?