During the Jurassic Period, several different mammalian lineages independently evolved an herbivorous lifestyle for obtaining energy. This has resulted in
A) different digestive patterns in herbivorous animals, some that depend on gut microbiota to digest plant material and some that do not.
B) different digestive patterns in herbivorous animals that all depend on gut microbiota to digest plant material.
C) the evolution of foregut fermentation, as seen in ruminants, as the only digestive pattern that depends on fermentative gut microbiota.
D) horizontal gene transfer of genes for glycoside hydrolases and polysaccharide lyases from bacteria to mammals.
Answer: B
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Mathematical analysis of Muller's ratchet reveals that the most important parameter in the rate at which the ratchet works is ________
A) population size B) mutation rate C) genetic heterogeneity D) sexual/asexual reproductive ratio
Sarah loved to run in the dry desert town of Needles, CA. However, when she moved to Mobile, AL, on the coast of the Gulf of Mexico, she was surprised that when she went out for a jog at 91°F (33°C), she developed dizziness and confusion sooner
than she had in the desert at the same temperature. She is probably suffering from ________. A) hypothermia B) hypothalamus C) homeostasis D) hyperthermia
Salmonelloses are:
What will be an ideal response?
A disease characterized by hypoactivity of the thyroid with weight gain and a sluggish metabolism as a result of destruction of thyroglobulin best describes:
A.) Graves disease. B.) myasthenia gravis. C.) Hashimoto's thyroiditis. D.) rheumatoid arthritis.