Results from the study of globin variants indicate that ____
a. all amino acid substitutions cause severe phenotypic effects
b. a change in a single nucleotide is sufficient to cause a genetic disorder
c. extended chains of phosphorus molecules function to carry oxygen
d. all of the changes in globin are due to changes in amino acid sequences
e. sickle cell anemia is not primarily an inherited disease
b
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Carbon balance focuses on the balance between
A) uptake of CO2 in photosynthesis and loss of heat via evapotranspiration. B) loss of CO2 through respiration and gain of nutrients. C) loss of H2O balanced with the gain of CO2 via transpiration. D) uptake of CO2 in photosynthesis balanced with the loss of CO2 during respiration.
Which component of a muscle does the calcium ion combine with to allow a contraction to occur?
A) myosin head B) actin C) troponin D) T tubule
Depending on the species, how many stomata are there on a single leaf?
1) Tens to hundreds 2) Hundreds to thousands 3) Thousands to millions 4) All of the above
A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. E. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.