Which one is a function of a cell's nucleus?
a. Contains the cell's DNA
b. Store and ship materials within the cell.
c. Produce proteins.
d. Detoxify substances within the cell.
e. Contributes to the cell's shape.
a
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Answer the following statements true (T) or false (F)
1. The complement strands of DNA have the same exact nitrogen base sequence, providing the semiconservative replication needed by cells. 2. Any change in a cell's DNA sequence is a mutation. 3. Change in a cell's DNA sequence is a common occurrence in the process of replication. 4. Each newly replicated molecule of DNA contains one conserved strand from the original DNA molecule. 5. A replicated chromosome consists of two sister chromatids.
By the ______________ theory, water is pulled upward through a plant by air's drying power, which creates continuous negative pressure.
A. transpiration B. cohesion-tension C. pressure flow D. adaptive E. water-conservation
According to the concept of punctuated equilibrium,
A) natural selection is unimportant as a mechanism of evolution. B) given enough time, most existing species will branch gradually into new species. C) a new species accumulates most of its unique features as it comes into existence. D) evolution of new species features long periods during which changes are occurring, interspersed with short periods of equilibrium or stasis. E) transitional fossils, intermediate between newer species and their parent species, should be abundant.
A pressurized airplane cabin and an oxygen tent over a patient in a hospital both impact the respiration rate of a person. How do these compare?
A. Both use the same mechanism to force hemoglobin to increase affinity for oxygen. B. The oxygen tent increases concentration of O2 while the airplane maintains total air pressure without changing concentrations. C. The oxygen tent and the airplane increase the air pressure to increase the PCO2. D. The oxygen tent and airplane cabin pressure lowers the partial pressures for normal breathing.