Why can sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen.
b. The malformed red blood cells cannot enter capillaries and, in fact, block them.
c. The malformed blood cells assume a sickle-shape.
d. The patient has two copies of the mutant gene.
e. More cells assume the sickle shape as oxygen concentration in the tissues falls.
B
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Based on the experimental design, which variable was the dependent variable?
A. Germination rate B. Type of light C. Seeds in the dark D. Moisture E. Temperature
The head of a sperm contains the
A) cell membrane. B) cytoskeleton. C) DNA. D) testosterone.
Which of the following characteristics is(are) a basic property of cells?
A) cells posses a genetic program and the means to use it. B) Cells are capable of producing more of themselves C) cells are highly complex and organized D) cells acquire and utilize energy E) all of the choices are correct
How might blocking angiogenesis have a negative impact as a cancer treatment?
a) by creating a higher oxygen tension in the tissue b) by concentrating tumor cells at a particular location in the body c) by creating a more O2-deficient environment for the tumor cells d) by driving tumor cells to seek out other sites in the body