Xylem tissue may contain each of these cell types, except which?
A. rays
B. fibers
C. tracheids
D. sieve cells
E. vessel members
Answer: D
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A small group of islanders leave "island A" and travel to "island B." After several generations on island B, a researcher finds that a large percentage of the population is left-handed. Left-handedness is a relatively rare trait on island A. A genetic event that explains this is
A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.
The process by which Pneumococcus transfers DNA between living type RII and heat-killed type SIII cells is known as __________
A) transformation B) replication C) transduction D) ligation E) conjugation
The life cycle in Figure 27-3 could represent:
a. a moss.
b. a whisk fern.
c. a club moss
d. a horsetail.
e. a liverwort.
What element is found in all organic compounds?
a. carbon b. oxygen c. helium d. iron e. nitrogen