Which of the following is false concerning smooth
muscle cells? They
a. do not have sarcomeres.
b. contain a single nucleus.
c. contain actin and myosin filaments.
d. can sustain contractions longer than can striated
muscle cells.
e. have contractile units arranged in an orderly
repeating fashion.
Answer: e
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Which of the following is not a tenet of the cell theory?
A) All organisms consist of one or more cells. B) All cells arise from preexisting cells. C) The cell is the basic unit of structure for all organisms. D) All cells have a membrane-bound nucleus. E) none of the above
From a standpoint of natural selection, we see that the heterozygous advantage for ?A?S individuals is balanced by the disadvantage to those with SCD or the wild-type alleles (and no malaria protection)
The action of these conflicting trends produces an overall increase in the mutant allele until it reaches a state where the gain and loss of ?S alleles is equal. What is the term for this stable condition that allows mutant alleles to remain in a particular population? A) equilibrium frequency B) heterozygote fitness C) restriction fragment length polymorphism D) single nucleotide polymorphism E) balanced polymorphism
The first law of thermodynamics states that every energy transfer involves a loss of usable energy (the so-called "heat tax").
a. true b. false
Why are open coal mines (strip mines) more likely to result in acid mine drainage than are underground mines?
A. Archaea such as Ferroplasma acidarmanus that produce acid from ore only live aboveground. B. Rainwater can leach acids from strip mines but not from underground mines. C. Air exposure increases the oxidation rate of sulfur and iron by bacteria, and oxidized sulfur or iron can combine with rainwater to form a strong acid. D. Strip mines have more iron- and sulfur-containing minerals that may be oxidized by acid-producing bacteria.