Which of the following techniques involves hybridizing a cDNA sample to a chip containing thousands of single-stranded DNA sequences, allowing one to study the expression of thousands of genes simultaneously?
A) PCR
B) Southern blot
C) FISH
D) Agarose gel electrophoresis
E) DNA microarray
E
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Pandas are an example of a(n) ____ species that is in danger of extinction because they are dependent on disappearing
bamboo forests.
a. “extinct in the wild” b. extinct c. indicator d. endemic e. keystone
Which of the following do NOT include parasites?
a. flatworms b. roundworms c. rotifers d. cnidarians e. rotifers and cnidarians
Which organelle increases in size, causing plant cells to elongate?
a. chloroplast b. mitochondrion c. nucleus d. ribosome e. vacuole
Fruit ripening represents an example of positive feedback. Which one of the following statements accurately justifies why the process of fruit ripening involves positive feedback?
A) Once seeds have reached maturity, chemical signals increase enzymatic activity in fruit to convert sugars into starches, thicken pulp, and maintain color in the fruit. B) Once seeds have reached maturity, chemical signals block enzymatic steps that normally convert sugars into starches and sugars accumulate from photosynthetic activity within the fruit. C) Chemical signals initiate a process that triggers enzymatic activity, which involves converting starches into sugars, softening of pulp, and color change of fruit. D) Chemical signals shut down enzymatic activity within the fruit, which results in breakdown of starches into sugars, softening of pulp, and color change of fruit.