One hypothesis on the origin of mad cow disease in cattle concerns
a) cattle feed contaminated with scrapie.
b) direct contact with animals infected with scrapie.
c) direct contact with other infected species.
d) hormones in cattle feed.
Ans: a) cattle feed contaminated with scrapie.
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What has been learned from comparative genomics studies?
a. Similar genes in different organisms perform very different functions. b. Prokaryotic DNA has different nucleotide bases compared to eukaryotic DNA. c. Similar genes do not exist in different species. d. Some genes are present in the genomes of almost all present-day organisms. e. Different species can have identical genome sequences.
Which of the following reservoirs holds the most carbon?
a. marine sediments b. ocean water c. plant biomass d. the atmosphere e. fossil fuel
Hemoglobin
a. tends to give up oxygen in regions where partial pressure of oxygen exceeds that in the lungs. b. tends to hold onto oxygen when the pH of the blood drops. c. tends to release oxygen where the temperature is lower. d. releases oxygen more readily in highly active tissues. e. may bind up to 16 molecules of oxygen.
The "a" helix of proteins is..?
a. Part of the tertiary structure and is stabilized by disulfide bridges. b. a double helix. c. stabilized by hydrogen bonds and commonly found in fibrous proteins. d. found in some regions of globular proteins and stabilized by hydrophobic interactions. e. a complementary sequence to messenger RNA.