Many structures and organs in the body are lined by epithelial tissue, and this layer of tissue
can vary in thickness from a single layer of cells to multiple layers of cells. Based on function,
which of the following do you think will have the most cell layers?
a. skin
b. lungs
c. blood vessels
d. both lungs and blood vessels
A
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
Ferns are particularly useful for research on plant growth and development because of the ____
a. numerous, large apical cells on the edges of their fronds b. single, large apical cell on the tip of their fronds c. single, large apical cell at the tip of their apical meristems d. numerous, small apical cells at the base of their apical meristems e. single, small apical cell at the base of their apical meristems
Grana and thylakoids are structural components found in ____
a. nucleoli b. mitochondria c. ribosomes d. chromoplasts e. chloroplasts
The insertion of a therapeutic gene into chromosomes at a site near a proto-oncogene unexpectedly caused which disease in boys with an X-linked genetic disorder?
A. Autoimmune diseases B. Fungal diseases C. Leukemia D. Alzheimer's disease E. AIDS