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.
A. The artificial membrane lacked a protein needed for glucose transport.
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DNA studies can be used to make all of the following conclusions except that
A. The gibbon ape line diverged about 15 million years ago. B. Orangutans split off about 10 million years ago. C. The gorilla lineage diverged about 8 million years ago. D. Modern man remained changeless for the last 1 million years.
The evolution of which tissue layer allowed an
increase in complexity of animal body organization? a. ectoderm b. mesoderm c. endoderm d. protocell e. Trichoplax
Making concept maps helps________________
A. Illustrates relationships between concepts B. Develops new ideas C. Studies complicated concepts D. All of the above
Several enzymes that fit the same substrate are
A. the same as the substrate. B. not able to function. C. in competition for the same substrate. D. able to interact and form one complex of enzymes.