The kelp shown in the accompanying figure represents the ____ stage in its life cycle
a. spore-bearing
b. gamete-forming
c. haploid
d. motile
e. feeding
ANSWER: a
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In a cow's udder, milk
A. contains Lactococcus. B. contains Lactobacillus. C. is acidic. D. is sterile.
A number of viruses often include a similar set of symptoms when they cause an infectious disease state (fever, headache, fatigue, runny nose). Why would they all cause the same symptoms if they're different viruses?
A. They all possess the same basic virulence genes and molecules, so they all trigger the same responses. B. The symptoms are associated with the immune system's response, NOT the molecules from the pathogens themselves. Our responses against viruses are fairly similar, regardless of virus type, so the symptoms are similar. C. Most viruses infect the upper respiratory tract-this leads to the common set of symptoms listed above. Only a few viruses infect areas away from this region. D. Viruses specifically infect mainly epithelial membranes. As such, the virally induced reaction is similar in different areas of the body due to the same basic cell types (epithelial cells) being infected in each area.
Which scientist was a skilled lens maker and first observed cell structure in protists?
a. Robert Hooke b. Theodor Schwann c. Anthony van Leeuwenhoek d. Matthias Schleiden
A tomato plant is mutated with gamma radiation. A cellular analysis reveals that ATP synthase complexes found in the thylakoid membrane are inserted backwards into the membrane. What is the most likely outcome of this error?
A. The ATP synthase will pump protons into the stroma in this orientation. B. The proton gradient in the thylakoid space will not be able to be used to generate ATP. C. The thylakoid membrane will become permeable to protons as a result of this change. D. A proton gradient will not be established in the thylakoid space in response to the activation of photosystem II. E. This change is not likely to have any effect on the function of the ATP synthase enzyme with respect to its role in photosynthesis.