The tips of the branches on a phylogenetic tree represent:
A. present-day groups.
B. common ancestors.
C. analogies.
D. sister groups.
E. homologies.
A
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Which of the following is not part of the step that occurs between glycolysis and the Krebs cycle?
A. Reduction of NAD+ B. Oxidation of pyruvic acid C. Coenzyme A attaches to an acetyl group D. Pyruvic acid accepts electrons from NADH
When it is important to count the number of cells, determine cell size, and differentiate between dead and live cells, a(n) ________ is used.
A. spectrophotometer B. SEM C. Coulter counter D. flow cytometer E. methylene indicator dye
Both the northern coniferous forest and the temperate rain forest are dominated by evergreen vegetation. What are the reasons in each biome?
What will be an ideal response?
A selected sample is one that is:
A. nonrandom. B. efficient. C. non-normal. D. distributed according to the Student t distribution.