Which animal has an endoskeleton made entirely of cartilage and reinforced with cartilage?
A) bullfrog
B) mackerel
C) shark
D) robin
Answer: C
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The pace of evolution does not always occur at a constant rate but is periodically interrupted by rapid bursts of speciation; this is known as ________.
What will be an ideal response?
Which of the following comparisons between the moss life cycle and fern life cycle is NOT valid?
A. Both kinds of plants have flagellated sperm that need water to reach the female gamete. B. The sporophyte generation is much larger than the gametophyte generation in ferns but is smaller than the gametophyte generation in mosses. C. The spores are produced in capsules on stalks in mosses but in small structure called sori on the underside of leaves in ferns. D. Both kinds of plants depend on wind for dispersal of spores. E. The gametes are produced in gametangia in mosses but on the underside of leaves in ferns.
Which of the following statements about transformation is false?
A. The bacterium E. coli is incapable of natural transformation. B. Like transduction and conjugation, natural transformation is an "accident" of plasmid biology. C. Artificial transformation is essential to many recombinant DNA techniques. D. All R-plasmids contain antibiotic-resistance genes. E. Natural transformation of the Enterobacteriaceae is a significant public health risk.
The serotinous cones of the longleaf pine, Pinus palustris, depend on _____ to release their seeds.
A. daylight B. extended freezes C. sustained rainfall D. fire E. animals