The closest living relative of P. chromatophora is the heterotroph P. ovalis. P. ovalis uses threadlike pseudopods to capture its prey, which it digests internally
Which of the following, if observed, would be the best reason for relabeling P. chromatophora as a mixotroph instead of an autotroph?
A) a pigmented central vacuole, surrounded by a tonoplast
B) a vacuole with food inside
C) a secretory vesicle
D) a contractile vacuole
B
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A transfusion reaction primarily involves
A. leukocytes. B. phagocytes. C. platelets. D. erythrocytes.
Some anti-cancer drugs block signal transduction pathways activated by growth factors. Which of the following would be a good target for such a drug?
A. An inhibitor of a protein kinase cascade. B. An inhibitor of Ca2+ release C. An inhibitor of adenylyl cyclase. D. An inhibitor of phospholipase C. E. A phosphatase inhibitor.
When researchers analyzed the remains of Tsar Nicholas II of Russia and his family, they found that the suspected Tsar and his living great-grandniece Xenia differed at nucleotide position 16169 in the mitochondrial DNA. Retesting the remains showed that for this site in the mitochondrial genome, the purported Tsar had thymine (T) in some samples and cytosine (C) in others. The most likely cause of this finding is
A) the samples were too old. B) incomplete dominance. C) pleiotropy. D) heteroplasmy.
The resolution of a microscope is
1.the ratio between the size of an image and its actual size. 2.the ability to observe two close objects as separate from each other. 3.the same as magnification. 4.the ability to determine the color of an object. 5.None of the options is correct.