Modern eukaryotic cells appeared ____ billion years ago
a. 0.5
b. 1
c. 1.5
d. 2
e. 3.7
ANSWER: c
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Twin spotting provides evidence of what genetic event?
A. Meiotic recombination B. Mitotic recombination C. Linkage D. Mutation E. Biological evolution
Where do plants get the carbon they use to make organic molecules?
a. glucose b. oxygen c. water d. starch e. carbon dioxide
What macroevolutionary concept is considered controversial by some people?
A) the appearance of new traits in existing populations B) the common descent of all organisms from one ancestral cell C) the concept of species being subdivided into separate populations D) the concept that genes can vary spontaneously
Seeds for desert plants often germinate once abscisic acid is washed away from the seed by water. In this scenario, abscisic acid is acting as a/an
A. suspensor. B. germination-inhibiting compound. C. hormone to induce the release of sugars from stored starch in the endosperm. D. hormone that stimulates cell expansion.