Conjugation by which of the following with an F- cell results in a cell that remains F-?
A) F+
B) Hfr
C) F
D) A and C
E) B and C
B
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Which of the following arise, directly or indirectly, from meristematic activity?
A) secondary xylem B) leaves C) dermal tissue D) tubers E) secondary xylem, leaves, dermal tissue, and tubers
In muscle contraction, and myosin filaments slide across each other.
A. intermediate filaments B. tubulin C. flagella D. actin E. cilia
Muscle contraction results from the repeated cycle of interactions between myosin and actin. What is the last step of this cycle, after which the cycle starts over again?
A) New ATP molecules bind to the myosin heads, causing them to disengage from the actin. B) The myosin heads split the ATP into ADP and Piand store the energy. C) The myosin head bends (the power stroke). D) Myosin heads extend toward the Z lines at the ends of the sarcomere.
What characteristic does Pertussis not have?
What will be an ideal response?