Solution:
The most appropiate unit of measurement fro most types of cells is CD4 counts are measured in cells per cubic millimetre = cells/mm3. A cubic millimetre (mm3) = mm3 = 1 mm x 1 mm x 1 mm.
This is the required answer.
<span>"they form a cyst: a hard covering is formed around the protozoan and metabolic rate is slowed"</span>
<span>1)archaebacteria lack peptidoglycan of eubacteria
2)different membrane lipids
3)archaebacteria have different DNA sequences</span>
Answer:
<u>Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.</u>
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