Van Leeuwenhoek's microscope magnified up to 300x. This was a(n)
a. Electron microscope.
b. Phase-contrast microscope.
c. Simple microscope.
d. Confocal microscope.
e. Compound microscope.
Ans: c. Simple microscope.
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People who are lactose intolerant can often consume some products made from milk such as cheese and yogurt because microorganisms in their digestive system consume the lactose. By comparison, people with a true milk allergy, which involves an immune response to milk protein, cannot consume milk or products made from milk. Given this information, what can you conclude about milk?
A. The protein that causes a true milk allergy is lactose. B. All people who are lactose intolerant are also allergic to milk. C. Yogurt contains live and active cultures of Lactobacillus acidophilus bacteria and therefore prevents an allergic response in people with a true milk allergy. D. Lactose is a carbohydrate, not a protein and is therefore not the cause of true milk allergies.
The condition in which shoot apical meristems suppress the growth of axillary buds is called ____________
A. repression B. apical dominance C. shoot-root ratio D. optimum growth pattern E. primary growth
You see a recombination frequency of 0.3%. What does this indicate?
A. That the genes are located close together on the same chromosome B. That the genes are on different chromosomes C. That the genes are assorting independently most of the time D. That the offspring has a large number of non-parental phenotypes E. That the genes are located on the same chromosome, but very far apart
Conservation biology includes
a. a survey of biological diversity. b. a look at the evolutionary origins of diversity. c. ecological considerations of diversity. d. an effort to maintain biodiversity. e. all of these.