Following crossing-over in meiosis I, which of the following is NOT true?
A. Maternal and paternal chromatids will always orient to opposite poles of the cell, remaining segregated from one another.
B. Random orientation of maternal and parental chromatids to either pole of the cell allows mixing of these in resultant gametes.
C. It is extremely unlikely that all 23 maternal and paternal chromosomes will end up in the same gamete.
D. A resulting gamete may have millions of possible different combinations of maternal and paternal chromosomes.
E. Chromatid pairs lined up in the cell are separated so that half end up in each daughter cell when division occurs.
A
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As a skeletal muscle contraction is initiated, acetylcholine binding alters the motor end plate membrane's permeability to
A) acetylcholinesterase. B) sodium ions. C) calcium ions. D) chloride ions. E) potassium ions.
The protein that enables RBCs to transport O2 is __________
Fill in the blank(s) with correct word
The absence or inhibition of acetylcholinesterase at a synapse would lead to ________.
A. numbness B. tetanus C. flaccid paralysis D. muscle wasting E. atrophy
Which of the following parts of a rib articulates with the body of a vertebra?
A. head B. neck C. body D. groove E. sternal end