Isotopes of an element are differentiated by their ____
a. atomic weight
b. number of orbital shells
c. element name
d. mass number
e. electron profile
ANSWER: d
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Which of the following statements best describes the benefit of lichens for humans?
A. Lichens can be used to monitor levels of chemical pollutants in the air. B. Lichens can be used to monitor radiation levels. C. Lichens begin soil formation by breaking down parent rock. D. Lichens fix nitrogen. E. all of the choices provided
When a drop of food coloring is placed in a container of clear water, the colored dye molecules ____
a. undergo osmosis to a different location b. undergo active transport to a different location c. diffuse to the top of the container d. diffuse equally throughout the container e. stay at the bottom of the container
The form of native DNA, referring to its two adjacent polynucleotide strands interwound into a spiral shape
What will be an ideal response?
Which method is often used to analyze proteins and nucleic acids by physical separation when estimating genetic variation in populations?
A) centrifugation B) absorption spectrophotometry C) electrophoresis D) in situ hybridization E) fluorometry