Based on molecular evidence, fungi were present on land at least ____ years ago
a. 1 billion
b. 500 million
c. 250 million
d. 125 million
e. 10 million
ANSWER: b
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A digestive system involving a tube-within-a-tube is characteristic of Cnidarians
____________________ Indicate whether the statement is true or false.
A mutation occurs in a gene that encodes a G1 cyclin, such that the protein is unable to bind to its CDK. How will this affect the cell cycle?
A. The cell will rapidly replicate its DNA and progress through mitosis, causing uncontrolled cell division, and leading to cancer. B. The cell will replicate its DNA, but will be unable to progress through mitosis. C. The cell will proceed thru mitosis without replicating its DNA. D. The cell will proceed to the S phase, and DNA repair enzymes will repair the mutated cyclin when it replicates the DNA. E. The cell will be stuck in G1 and will not advance through the cell cycle.
Which of the following chemicals is used to induce polyploidy?
a. colchicine b. ethylene c. gibberellin d. cytokinin e. auxin
The first cells to encounter a threat to the body are
usually the _________ as they patrol body __________. a. neutrophils; surfaces b. macrophages; interstitial fluids c. mast cells; linings d. macrophages; tissues e. neutrophils; interstitial fluids