Why do free-living bacteria, such as Escherichia coli with 4000 genes, have more genes than intracellular bacteria?
What will be an ideal response?
Ans: They have to have genes to carry out their own intermediary metabolism, whereas intracellular bacteria make use of the host enzymes.
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
During anaphase I, each homologue is separated from its partner. This process is called
a. nondisjunction. b. separation. c. segregation. d. disjunction. e. amelioration.
Some species of Streptococcus, when grown on blood agar, produce a complete hemolysis with the formation of a clear zone around the colony; this is referred to as ________.
A. gamma-hemolysis B. alpha-hemolysis C. beta-hemolysis D. None of the choices are correct.
What enables the copied chromosomes to separate during binary fission?
a. The nuclear membrane dissolves. b. The mitotic spindle drives the separation. c. The septum splits the replicated chromosomes. d. The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.