Why are the trans-fatty acids common in fast foods a concern to nutritionists?
A) They increase the incidence of clogged arteries.
B) They decrease the availability of iron to bodily cells.
C) They cannot be digested by the human body.
D) They outcompete the enzymes needed for normal bodily functions.
A
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Many terrestrial arthropods exchange gases with their environments by using tracheae, tubes that lead from openings (called spiracles) in the animal's exoskeleton or cuticle directly to the animal's tissues. Some arthropods can control whether their spiracles are opened or closed; opening the spiracles allows the carbon dioxide produced in the tissues to travel down the tracheae and be released outside the animal. Klok et al. measured the carbon dioxide emitted over time (represented by ) by several species of centipedes. The figure below presents graphs of their results for two species, Cormocephalus morsitans and Scutigerina weberi. (C. J. Klok, R. D. Mercer, and S. L. Chown. 2002. Discontinuous gas-exchange in centipedes and its convergent evolution in tracheated arthropods. Journal of Experimental Biology 205:1019-29.) Copyright 2002 The Company of Biologists and the Journal of Experimental Biology. Look at the graph for Cormocephalus morsitans in the figure above. What is the best interpretation of these results? A) The centipede had its spiracles open the entire time. B) The centipede had its spiracles closed the entire time. C) The centipede had its spiracles open when carbon dioxide (CO2) emission peaked and closed when CO2 emission was low. D) The centipede had its spiracles closed when carbon dioxide (CO2) emission peaked and open when CO2 emission was low.
What do you know about receptor tyrosine kinases? What other information is related to the question?
What will be an ideal response?
Which of the following statements is incorrect regarding the effects of rubella and rubeola in different populations?
A. Infection during pregnancy with either of these viruses can cause serious injury to the fetus. B. Congenital rubella is least serious if it is contracted during the final trimester of pregnancy. C. A six-year-old child infected with rubeola will experience fever, cough, and a rash, and barring complications, should recover in a few weeks. D. A 30-year-old man infected with rubella will experience severe symptoms and require constant medical attention for several weeks.
You conduct an experiment in which you add increasing amounts of substrate to an enzyme solution and then measure
the resulting reaction rate. You plot the rate of the reaction on the Y-axis versus substrate concentration on the X-axis. What do you conclude from your graph? a. The reaction rate is independent of substrate concentration. b. The reaction rate decreases with increasing substrate concentration. c. The reaction rate is directly proportional to substrate concentration. d. The reaction rate increases but then decreases, forming a bell-shaped curve. e. The reaction rate increases with increasing substrate concentration up to a point, above which the rate remains constant.