To study the genome of the loblolly pine, Pinus taeda, researchers obtained DNA from ____ cells, thereby halving the
amount of DNA for initial sequencing.
a. haploid
b. diploid
c. triploid
d. polyploid
e. hexaploid
ANSWER: a
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Figure 17.2 In Figure 17.2, What portion will typically attach to a host cell? e a and d a and c b b and c
A) a and c
B) b
C) b and c
D) a and d
E) e
In the vascular bundles of most dicot stems, primary phloem differentiates toward the ________of the stem, while primary xylem differentiates toward the ________of the stem.
A. middle; outside B. cork cambium; vascular cambium C. outside; middle D. shoot tip; roots E. middle; middle
Members of the ____ subphylum are now all extinct, but they were extremely numerous in shallow Paleozoic seas
Most of them were dorsoventrally flattened and heavily armored, with two deep longitudinal grooves that gave their body a three-lobed appearance.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
Rough endoplasmic reticulum has ribosomes on its surface.
a. true b. false