The earliest known land plants date to the
A) Pleistocene (late Cenozoic era).
B) Ordovician (early Paleozoic era).
C) Carboniferous (late Paleozoic era).
D) Jurassic (middle Mesozoic era).
Answer: B
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The composition of the normal microbiota may be affected by
A. hormonal changes. B. use of antibiotics. C. obesity level. D. diet. E. All of the choices are correct.
Which structure is large enough to be seen under a light microscope?
a. small molecule b. protein c. virus d. chloroplast e. complex carbohydrate
The field of epigenetics has opened the way for the development of a new class of anticancer drugs ____
a. that are very similar to many chemotherapy treatments but are much more targeted and effective b. that stop mutations before they occur in individuals with a predisposition to certain kinds of cancer c. that increase the level of methylation in cancer cells d. used specifically to treat breast cancer because the key genes involved in this cancer cannot be epigenetically modified e. because of the discovery that epigenetic modification of key genes is important in some cancers and the fact that epigenetic changes are reversible
All of the following statements concerning characteristics of predator prey relationships are correct EXCEPT
A. A rise in the population of prey is often followed by a rise in population of predators B. A rise in the population of predators is followed by a decrease in the population of prey C. Camouflage is an adaptation that protects prey D. The production of large numbers of offspring within very short periods of time ensures the survival of some prey populations E. The population of predators most often eliminates the population of prey