Which element is considered a micronutrient needed by plants?
a. carbon
b. hydrogen
c. nitrogen
d. magnesium
e. zinc
ANSWER: e
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
What is the main reason that duck-billed platypuses are classified as mammals rather than birds? Consider that they possess a bill, as do birds, and lay eggs rather than give birth to live young like other mammals
What will be an ideal response?
Synergy among drugs is best described as: what results when two drugs in combination with each other lessens the activity of each drug to the point the bacteria thrive and the patient's condition could worsen.
a. true b. false
Which term best describes the typical movement of xylem sap from roots to shoot parts?
a. facilitated diffusion b. symport c. osmosis d. bulk flow