In legumes, it has been shown that thigmotropism is correlated with _____
A) abscisic acid (ABA)-stimulated closing of guard cells caused by loss of K+
B) rhythmic opening and closing of K+ channels in motor cell membranes
C) senescence (the aging process in plants)
D) flowering and fruit development
Answer: B
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What structure in the RNA polymerase of bacteria helps keep the transcription bubble open?
A. the rNTP entry channel B. the DNA entry channel C. the pin structure D. the RNA exit channel E. the RNA entry channel
Pseudomonas
A. are resistant to many disinfectants and antimicrobials. B. are mostly harmless except for the opportunistic P. aeruginosa. C. require nutrient-rich environments. D. do not contain plasmids. E. are resistant to many disinfectants and antimicrobials AND are mostly harmless except for the opportunistic P. aeruginosa.
The receptors that detect the amount of salt in an
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Respond to statements 117–121 in reference to the five items
listed below. a. antigens b. antibodies c. helper T cells d. cytotoxic T cells e. effector B cells E 117. These bind, as in a lock-and-key mechanism, to foreign proteins. D 118. These produce immunoglobulins in response to the reinvasion by a virus. D 119. These directly attack the foreign cells of an incompatible skin graft. M 120. An Rh+ molecule in the body of an Rh woman is an example of these. D 121. Proteins produced by these attack bacteria and viruses in the blood.