Which of the following is a common protist that can swim using a flagellum and is photosynthetic?
a. Red algae
b. Ciliates
c. Green algae
d. Foraminiferans
e. Brown algae
Ans: c. Green algae
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The biosphere is defined as the portion of _____ where life exists.
A. the earth B. the atmosphere C. the ocean D. land on Earth E. fresh and salt water
The cellular structure indicated by the arrow in the accompanying figure is responsible for:a
replication. b. protein synthesis. c. cellular respiration. d. digestion of unused organelles. e. lipid and fatty acid metabolism.
Which of the following is evidence supporting the Lyon hypothesis of X inactivation?
A. A highly condensed structure is consistently observed in female cells, but not in normal male cells. B. Female mammals that are heterozygous for X-linked traits are phenotypic mosaics. C. A female cat that is homozygous for coat color cannot have a calico phenotype. D. Calico patterns of coat color are never exactly the same. E. All of the answers are correct.
Lisa receives a dose of epinephrine. What does this do to her heart rate?
A. does not alter it B. makes it skip every other beat C. decreases it D. stops it E. increases it