In gel electrophoresis, what causes the DNA fragments to migrate?
A. Gravity D. Magnetic attraction
B. Vibrations E. Centrifugal force
C. Electrical charge
C
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Where would you expect to find tight junctions?
A) in the epithelium of an animal's stomach B) between the smooth endoplasmic reticulum and the rough endoplasmic reticulum C) between plant cells in a woody plant D) in the plasma membrane of prokaryotes
For the reaction Y->X at standard conditions with [Y] = 1 M and [X] = 1 M, ?G is initially a large negative number. As the reaction proceeds, [Y] decreases and [X] increases until the system reaches equilibrium
How do the values of ?G and ?G° change as the reaction equilibrates? (a) ?G becomes less negative and ?G° stays the same. (b) ?G becomes positive and ?G° becomes positive. (c) ?G stays the same and ?G° becomes less negative. (d) ?G reaches zero and ?G° becomes more negative.
A man with the autosomal recessive disorder phenylketonuria (PKU) and a woman without PKU have a son named Peter, who does not have PKU. Peter is curious about whether his mother is a carrier for PKU. Which of the following facts would allow him to know?
What will be an ideal response?
Non-native species can have important effects on biological communities by ________
A) preying upon native species only B) competing with native species for resources only C) reducing biodiversity only D) All of these are effects that non-native species can have on biological communities.