One of the treatments for cancer to slow the growth of tumors and kill cancer cells within the body requires chemicals to be administered to the patient. These chemicals affect cells that are dividing or have just recently divided. What is this type of treatment called?
A) surgery
B) antibiotic treatment
C) radiation therapy
D) chemotherapy
Ans: D) chemotherapy
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Cells within a biofilm excrete an adhesive matrix primarily composed of ________ but can also contain nucleic acids as well as proteins
A) lipids B) fatty acids C) monomers D) polysaccharides
What effect does the nervous system have on the heart rate?
A. Stimulation by parasympathetic nerves causes the heart rate to slow down. B. Stimulation by sympathetic nerves sets the resting heart rate of the pacemaker cells in the SA node. C. Stimulation by sympathetic nerves causes the pacemaker cells of the AV node to depolarize more rapidly than the pacemaker cells of the SA node. D. Stimulation by either the sympathetic or parasympathetic nerves causes pacemaker cells in the SA node to depolarize more slowly. E. The nervous system does not directly affect the heart rate.
When a leaf is wounded, it releases jasmonic acid. What effect does jasmonic acid have?
a. It lowers the levels of ethylene and hydrogen peroxide. b. It triggers repair mechanisms within the plant. c. It triggers a death signal in plant cells near the wound. d. It increases transcription of genes whose products include a number of volatile chemicals that the plant releases into the air. e. It increases transcription of hundreds of genes whose products confer general hardiness to the plant.
The technique of preparing mitotic chromosomes involves a staining procedure using Giemsa stain. One variation of this technique allows a low-resolution of chromosome bands while a second variation allows a high resolution. At low resolution we can see about ________ bands while at high resolution we see about ________ bands.
A) 300; 2000 B) 300; 1000 C) 100; 2000 D) 100; 1000