Judah Folkmann suggested that solid tumors __________.
a) might be desiccated by osmotic action
b) might be destroyed by enhancing their ability to form new blood vessels
c) might be destroyed by inhibiting their ability to form new blood vessels
d) might be dissipated by enhancing the ability of cancer cells to separate from each other
e) might be enlarged by breaking down neighboring tissues
Ans: c) might be destroyed by inhibiting their ability to form new blood vessels
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Consider the following points: (a) All excavates live in environments where oxygen availability is low; (b) all excavates lack mitochondria;
and (c) all excavates have some mitochondrial genes. Based on this information, which of the following statements is true of the excavate lineage? A) Their ancestors were eukaryotes that existed prior to the origin of mitochondria. B) Their ancestors had mitochondria, but the mitochondria were lost over time. C) Their ancestors were not able to metabolize glucose. D) Excavates are in the process of acquiring mitochondria through evolutionary adaptation.
An animal that does NOT maintain a relatively constant internal water concentration as the osmolarity of its environment varies is termed an
A. osmoconformer. B. osmoregulator. C. isoconformer. D. isoregulator. E. hydroconformer.
Which of the following is NOT involved in turning off the lac operon?
a. the short lifespan of mRNA molecules b. the short lifespan of the lac operon gene products c. the depletion of lactose from the cytosol d. the lack of allolactose to bind to the repressor e. binding of repressor to the operator
The probability of producing a phenotypically normal child by two parents who are carriers for an
autosomal recessive disorder is a. 50 percent. b. 0 percent. c. 100 percent. d. 25 percent. e. 75 percent.