Four of the five groups listed below are in the domain Eukarya. Select the exception
a. plants
b. protists
c. animals
d. fungi
e. bacteria
e
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What is the length of an average rod-shaped bacterium (bacillus)?
A) 3 ?m B) 3 nm C) 0.3 mm D) 0.03 mm
Treponema pallidum
A. can cross the placenta. B. has a hooked tip to attach to epithelium. C. is transmitted by direct sexual contact. D. has humans as the sole reservoir. E. All of the choices are correct.
The maintenance of the volume and
composition of body fluids is the primary responsibility of which system? a. integumentary b. immune c. digestive d. urinary e. circulatory
Which of the following is an example of positive feedback?
A) After eating a meal containing high glucose levels, the pancreas secretes more insulin, a hormone that lowers blood glucose levels. B) After cutting your finger, the injured tissue releases chemicals that activate platelets in the blood. These activated platelets release chemicals to activate more platelets, leading to the formation of a blood clot. C) An elevation in blood pressure causes heart rate to decrease, thereby causing blood pressure to decrease. D) The secretion of the hormone TSH stimulates the thyroid gland to secrete thyroxine. Thyroxine, in turn, inhibits the secretion of TSH.