Discuss permeability in plant cell walls
What will be an ideal response?
ANSWER: The primary plant cell wall does not prevent most solutes from moving into plant cells.
The majority of solutes can diffuse through the wall. However, some molecules such as
proteins, RNAs and virus particles cross the cell wall by way of plasmodesmata that
connect adjacent cells.
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Which two enzymes do DNA researchers need to cut and paste DNA from different sources?
a. restriction enzymes and DNA ligase b. restriction enzymes and DNA polymerase c. DNA ligase and DNA polymerase d. restriction enzymes and helicase
e. helicases and DNA polymeraseHow will the destruction of forests affect the amount of carbon dioxide in the atmosphere?
1.It should have no effect. Carbon dioxide is put in the air by the burning of fossil fuels. 2.There will be fewer plants to absorb carbon dioxide through photosynthesis, so carbon dioxide can build up in the atmosphere. 3.It should reduce the amount of carbon dioxide produced since there will be fewer organisms undergoing cellular respiration. 4.Oxygen and carbon dioxide are balanced. If you increase carbon dioxide by plant removal you will decrease the amount of oxygen.
Which feature is found in DNA?
A) Adenine (A) forms a base pair with cytosine (C). B) The backbone of each strand is composed of alternating sugar and phosphate groups. C) Complementary strands are held together by ionic bonds. D) DNA remains condensed in a short linear form both before and after cell division.
When a Xenopus oocyte is stimulated with the hormone progesterone, it enters meiosis and arrests at ______, awaiting fertilization by a sperm.
a. prophase I b. metaphase I c. prophase II d. metaphase II