Why do some bread recipes suggest letting the dough rise in a warm place after kneading?
A. The metabolic rate of yeast slows down at warmer temperatures, so more sugar is maintained and the bread is sweeter.
B. Yeast cannot carry out fermentation at room temperature.
C. Warming the bread slightly before cooking it in a hot oven stretches out the gluten.
D. The metabolic rate of yeast speeds up at warmer temperatures, so more carbon dioxide is released and the dough rises more quickly.
Answer: D
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Huntington’s disease (HD) is a fatal neurological disease that is inherited in an autosomal dominant manner. Most people with HD develop signs and symptoms in their late 30s or early 40s, but the onset of disease may be earlier or later in life. A 20-year-old woman comes to your genetic counseling center because she knows that HD occurs in members of her family. Her paternal grandfather was afflicted, but so far her 41-year-old father shows no symptoms. Her two great-great grandmothers on her father's side were healthy well into their 90s, and one of her great-great grandfathers died of unknown causes at 50. Testing for HD is extremely expensive, but she is concerned that she may fall victim to this disease and wants to plan her life accordingly.
After examining her pedigree you advise her to A. get tested because there is no possibility that she does not carry the HD allele. B. not get tested because only males in her family get the disease. C. get tested because her father could be heterozygous for the HD allele. D. not get tested because her father is at worst, heterozygous for the HD allele. E. not get tested because her father shows no symptoms.
Steroid hormones are nonpolar molecules derived from cholesterol
a. True b. False
What is the primary advantage of four-chambered hearts possessed by mammals over the hearts of reptiles and amphibians?
a. Larger hearts allow mammals to warm their blood more efficiently, which expands the habitat range available to them. b. An extra ventricle allows the heart to continue functioning in case any other chamber of the heart fails. c. Fully separated ventricles prevent partial deoxygenation of blood in the heart, allowing more oxygen to reach remote tissues. d. Larger hearts accommodate nucleated red blood cells unique to mammals, which are larger and contain more hemoglobin
Four of the five choices listed below can upset
genetic equilibrium. Select the exception. a. interbreeding paternal or fraternal relatives b. genetic drift c. mutation d. natural selection e. gene flow