In a hypothetical situation, the genes for sex pilus construction and for tetracycline resistance are located on the same plasmid within a particular bacterium
If this bacterium readily performs conjugation involving a copy of this plasmid, then the result should be the _____. A) temporary possession by this bacterium of a completely diploid genome
B) rapid spread of tetracycline resistance to other bacteria in that habitat
C) subsequent loss of tetracycline resistance from this bacterium
D) production of endospores among the bacterium's progeny
B
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Which observation below provides evidence that differentiated cells retain all the genes of developing cells?
A) Developing cells have many mRNA transcripts that can hybridize with DNA from mature cells. B) Differentiated cells generally synthesize a specific group of proteins. C) Nuclei from mature cells can direct the development of an entire individual. D) Not all mature cells are capable of differentiation.
Oxidation is defined as the removal of ________. In biological systems, these are usually accompanied by protons in a process called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements concerning calcium ions is FALSE?
a. They are involved in fertilization, blood clotting, and microtubule disassembly. b. Their concentration in the cytosol rises when Ca2+ gates open in the ER. c. Their concentration in the cytosol is usually higher than in the extracellular fluid. d. They can act by themselves, without binding to calmodulin. e. They can exert an effect after binding to calmodulin.
Which change is most important in stomatal closing?
a. declining sucrose concentrations b. rising sucrose concentrations c. rising potassium concentrations d. declining potassium concentrations e. declining chloride concentrations