Some species of Acacia have co-evolved with species of ______, which actively defend the plant from browsing animals and even vines
A. beetles
B. aphids
C. ants
D. scorpions
E. biting flies
C
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How are polypeptide chains in antigens bound together?
a. Polypeptide chains form hydrogen bonds. b. Serine amino acids form molecular bonds. c. Cysteine amino acids form molecular bonds. d. Polypeptide chains do not bind in antigens.
In cocker spaniels, black coat color (B) is dominant
over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) are crossed, what fraction of the black, solid offspring will be homozygous? a. 4/16 b. 9/16 c. 1/9 d. 3/16 e. 3/4
Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells cannot_____
A) replicate DNA B) undergo mitosis C) exchange DNA with other cells D) repair thymine dimers
In experiments where researchers suspect that a hormone may be responsible for a certain physiological effect, they may cut the neurons leading to the organ where the effect being studied occurs. What is the purpose of cutting these neurons?
A) to make sure that the effect is not occurring through actions in the nervous system B) to make sure that the organ being affected cannot function unless the researchers stimulate it with an external electrical probe C) to impair the normal functions of the organ so that the hormonal effect can be more easily studied D) to numb the organ so that it can be probed without inducing pain in the lab animal