Which of the following statements best describes how alkylating agents work as chemotherapy?
A. Alkylating agents have no long term risks or side effects, making them useful tools for treating cancer.
B. Alkylating agents insert themselves into the DNA of healthy cells, resulting in an increase in mitosis for healthy cells. These healthy cells can then help fight cancerous cells.
C. Alkylating agents work to prevent the cell from replicating its genetic material, preventing cell division.
D. Alkylating agents are not very precise and can insert into the DNA of any cell.
Answer: C
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One of the reasons study of nitrogen use in plants is of special interest is because:
A. nitrogen is limited in our atmosphere. B. nitrogen in its atmospheric form is not useable by plants. C. nitrogen is often toxic to plants. D. none of the forms of nitrogen is easily absorbed by plants. E. nitrogen is not an essential element for plant growth.
During muscle contractions
1.the myofibrils shorten. 2.the actin and myosin filaments slide over each other. 3.the actin filaments move toward the middle of the sarcomere, and then move away on relaxation. 4.the muscle thickens. 5.all of the choices
The salinity of a small inland lake has recently started to increase. Researchers are planning to study the lake over several decades to investigate how freshwater organisms survive significant changes in their natural habitat. Which of the following physiological mechanisms will the researchers most likely observe among the surviving organisms in the lake?
(A) Prokaryotic organisms will use various mechanisms to counteract swelling of cells as a result of increased water uptake. (B) Single-celled organisms will use various mechanisms to counteract the increased flow of water from cells to the environment. (C) Eukaryotic organisms will use various mechanisms to counteract the diffusion of positively charged ions across the cell membrane. (D) Multicellular organisms will use various mechanisms to counteract the loss of cell adhesion as a result of calcium deficiencies.
When Mendel crossed tall (Tt) plants with tall (Tt) plants the offspring
a) did not grow and reproduce. b) were always short. c) were always tall. d) were always medium height. e) were mostly tall individuals and a few short individuals.