When scientists examined fossils of Ordovician trilobites, they found that a sample from any given stratum was almost
always intermediate in their morphology between samples from strata just above or below it, providing evidence of ____.
a. convergent evolution
b. rapid speciation
c. adaptive radiation
d. punctuated equilibrium
e. phyletic gradualism
ANSWER: e
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All ecosystems need energy. What is the originating source for most of the energy that powers ecosystems on this planet?
A. Potential energy B. Geothermal energy C. Solar energy D. Wind energy
Rough endoplasmic reticulum is studded with ribosomes.
Answer the following statement true (T) or false (F)
Imagine that a cell can be treated with a drug that prevents proteins from undergoing large conformational changes. Which transport proteins would be unaffected by this drug treatment?
A. Na+/K+ ATPase B. H+/sucrose symporter C. Fructose uniporter D. Aquaporin E. All transport proteins would be affected
When water ionizes, the negatively charged OH- fragment is the ________ ion.
Fill in the blank(s) with the appropriate word(s).