Which of these is NOT an evolutionary advantage of the first cell membranes?
A) Membranes allow cells to move independently.
B) Membranes allow for cells to be compartmentalize.
C) Membranes allow substances to be concentrated inside a cell, or pumped outside.
D) Membranes allow genotypes and the phenotypes they produce to stay linked.
E) All of the above are advantages of cell membranes.
A
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Microorganisms are best defined as organisms that
A. cause human disease. B. can only be found growing in laboratories. C. are infectious particles. D. are too small to be seen with the unaided eye. E. lack a cell nucleus.
People at greatest risk for pneumococcal infections include all the following except
A. those with underlying lung disease and viral infections. B. adolescents and young adults. C. patients without a spleen. D. young infants. E. the elderly.
Refer to the accompanying figure. Which structure is the source of sebum, a substance that inhibits bacterial growth on the surface of the skin?
a. 5
b. 7
c. 10
d. 11
e. 12.
Where in a cell is ATP made?
a. chloroplasts b. ribosomes c. mitochondria d. nucleus e. lysosomes