A jellylike substance produced by red marine algae and used as a culture medium for microorganisms is:
a. Red ooze
b. Carageenan
c. Gelatin
d. Agar
e. Algin
Answer: d. Agar
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Use the following information to answer the following question(s): You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms."If you give 100 sick people tablets similar to Echinacea but with no herb (called a placebo), and do not tell them whether they are receiving the placebo or the Echinacea tablet, what kind of control would this be?
A. A positive control, since you are expecting a change to happen in this control group B. A blind control, since the sick people do not know whether they are receiving the placebo or the Echinacea C. A negative control, since you are expecting no change to happen in this control group D. Both B and C are correct
What important metabolic intermediate does not cross the inner membrane of the mitochondria?
A. Pyruvate B. ATP C. Acetyl-CoA D. Oxygen
Deforestation:a
retards soil erosion. b. releases carbon dioxide that may contribute to global warming. c. has no effect on the extinction of biological species. d. promotes the preservation of tropical birds. e. is only a threat to tropical rain forests.
How many questions are needed in this dichotomous key to determine if the unknown is Bacteroides?
a. Four b. Three c. Five d. Two