You work for a company that manufactures food products. A new "wonder food" is being distributed by a rival company. The researchers in your company determine that the "wonder food" contains only carbon, oxygen, and hydrogen. At this point, your
researchers can say with certainty that the food
A) includes proteins.
B) could only be made of triglycerides.
C) could only be made of carbohydrates.
D) does not include proteins or nucleic acids.
Answer: D
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Why are waterlogged soils often infertile?
A. Nitrifying bacteria require oxygen, and the excess water takes the place of oxygen-containing air. B. Water molecules are used instead of oxygen for cellular respiration. C. There is less carbon in waterlogged soil than dry soil. D. The lack of physical space in this type of soil blocks bacterial growth.
The venom of black widow spiders (Latrodectus mactans) contains an enzyme that hydrolyzes lecithin to the phospholipid lysolecithin. The lysolecithin lyses red blood cells, destroying them. One possible mechanism whereby lysolecithin disrupts the plasma membranes of red blood cells is that it
A) is toxic to red blood cells. B) may act in a manner similar to detergents. C) binds calcium ions, compromising membrane integrity. D) acts as a second messenger to stimulate apoptosis. E) None of the above is a possible mechanism.
Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
Species that are especially intolerant of physical disturbance to their environment are referred to as ____.
A. ecosystem engineers B. indicator species C. exotic species D. native species E. pioneer species