Cotransport systems directly provide energy for active transport of solutes
__________________ Indicate whether the statement is true or false.
F, indirectly
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Which of the following crosses lipid bilayers the fastest?
A) a sodium ion B) a small, polar molecule like water C) a large, polar molecule like glucose D) a small, nonpolar molecule like oxygen (O2)
Genetic variations in DNA sequences in human populations, such as single nucleotide polymorphisms (SNPs), have been used to map "disease genes" by determining whether the SNP is linked to the mutant gene
A. true B. false
Muscle fibers generate maximum force:
A. at intermediate lengths. B. when pulled to long lengths before contraction. C. when contracting at short lengths. D. when the myosin filaments contact the Z discs. E. when the overlap between actin and myosin is minimal.
Fatty acids can be metabolized for energy; they enter aerobic respiration ________
a. at the electron transport step as the reduced electron carriers FADH2 and NADH b. at glycolysis, but first must be converted to glucose c. at the Krebs cycle after cleavage and conversion to acetyl-CoA d. in glycolysis after enzymatic conversion to PGAL