When e-cadherin expression ___ this increases invasiveness of tumor cells.
a. increased
b. decreased
c. stays the same
d. none of the above
Ans: a. increased
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The cytoskeleton of plant cells includes:
A. microtubules, microfilaments, and intermediate filaments. B. actin, microfilaments, and intermediate filaments. C. actin, microtubules, intermediate filaments. D. tubulin, microfilaments, and intermediate filaments. E. microtubules and microfilaments.
The effects of allometric growth on head morphology in the human and chimpanzee
A. The human and chimp fetal skull are exactly the same, the human jaw development slows down after adulthood.
B. Heterochrony is occurring, the chimp jaws continue to develop at a faster rate than human jaws.
C. Paedomorphosis is occurring, the human jaw retains its small size while the chimp jaw continues to grow even in adulthood.
D. The nasal passages of the chimp are shortened due to reduced growth during fetal development while the nasal passages of the human grow through adulthood.
E. All of the choices are correct.
The "lub" heart sound represents ____
a. a heart murmur b. closure of the atrioventricular valves c. closure of the semilunar valves
d. hypertension e. movement of actual heart muscle
When a cigarette filter is discarded on the side of the road or in the grass it will last for ________ before it is finally broken down
a. 2 weeks b. 2.5 years c. 6 months d. 3 days e. 10 years