Methods of microbial control called ________ arrest the growth of microbes
A) microbicial
B) microbistatic
C) sanitizing
D) degerming
E) antiseptic
B
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Emotional stress, a diet low in fiber and dehydration can lead to which problem associated with the digestive system?
a. Lactose intolerance b. Diarrhea c. Constipation d. Pancreatitis e. Gallstones
Catabolic pathways that break down complex substances into more usable units are usually regulated in response to the
A) end products of the pathway. B) levels of the molecule that is to be broken down. C) other metabolites that are limiting. D) levels of enzymes in the pathway.
You have discovered a previously unidentified plant, and you cultivate it in your lab
You notice that its flowers close when people are talking, yet are open when the lab is relatively quiet. You suspect that this plant may have the ability to hear! Which of the following hypotheses is (are) the most reasonable to explain this phenomenon? I) There is a cell-surface protein on the epidermal cells that becomes phosphorylated in response to vibration by sound waves. II) There are tiny hairs on epidermal cells that bend in response to the vibration of sound waves, triggering an action potential in epidermal cells. III) There is a cell-surface receptor on root cells that becomes phosphorylated when the soil vibrates in response to sound waves. A) only I B) only II C) only III D) only II and III E) I, II, and III
In an antibody-mediated immune response, with which cells do naïve helper T cells interact?
a. antigen presenting B cells b. effector helper T cells c. memory B cells d. antigen presenting dendritic cells e. effector B cells