Embryonic endoderm gives rise to:
a. muscle.
b. the lining of the digestive tract.
c. the nervous system.
d. skin.
e. skeletal tissue
b
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A 36-year-old man enters the emergency department with lesions that are painful, red, swollen, and indurated. He is febrile and exhibiting regional lymphadenopathy (swollen glands). The le-sions are marked and well demarcated with a raised border. Which organism is most likely re-sponsible for causing this infection?
a. Streptococcus pyogenes b. P. aeruginosa c. Microsporum spp. d. Bacteroides fragilis group
Which of the following is the best hypothesis for the honeybee study?
a. Honeybees navigate using the sun. b. Patients undergoing anesthesia during surgery are often disoriented when they awaken. c. Isoflurane interferes with the functioning of an organism’s biological clock. d. Both mammals and honeybees have biological clocks that are similar in function.
A man’s mother died from Huntington’s disease, a neurodegenerative genetic disorder caused by a dominant mutant allele that exhibits high penetrance. The man’s daughter wants to be tested for the mutant gene, and he tells her not to bother because her probability of having the disease is zero. Is he telling her the truth? Choose the most accurate answer.
a. No, her probability of having the mutant allele is 0.5 or 50%. b. No, her probability of having the mutant allele is 0.25 or 25%. c. Yes, his probability of having the disease is only 0.05 or 5% and is diluted to almost zero in his daughter. d. We do not know whether he is telling the truth or not based on the information given.
Which of the following is a characteristic of a foundation species?
a. being a primary producer b. being a voracious feeder c. reproducing asexually d. lacking natural prey