Cardiac glycosides, molecules causing a drastic effect on vertebrate heart function, are produced as defensive chemicals by plants belonging to
A. the grass family.
B. the mustard family.
C. the bean family.
D. the poison ivy, oak, and sumac families.
E. the milkweed and dogbane families.
Answer: E
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_______ are strains that are unable to grow on a minimal medium that supports growth of the wild type strain, but are able to grow on the minimal medium if one or more nutritional supplements are added.
A. Minitrophs B. Autotrophs C. Prototrophs D. Auxotrophs
Purple flower (A) is dominant over white flower (a), and tall stem (B) is dominant over short stem (b). The Punnett square
represents a cross between two dihybrids (AaBb ? AaBb). In the figure above, how many plants would have the genotype AaBb?
a. 1 b. 3
c. 4 d. 6 e. 9
Polysaccharides ____
a. are composed of three linked monosaccharides b. contain only straight monomer chains c. are always made of glucose molecules d. may be insoluble and difficult to break down e. are formed by cleavage reactions
Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs. 2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it. 3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment. 4.The sympathetic branch of the autonomic system usually speeds up the activities of the body. 5.The parasympathetic system usually speeds up the activities of the body.