The seeds with heavy, waxy coats and air sacs are
likely dispersed by
a. animals.
b. water.
c. wind.
d. propulsion from the plant.
e. none of these.
Answer: b
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In agarose gel electrophoresis, DNA molecules move towards the ____ pole because they ____
a. positive; are negatively charged
b. negative; are positively charged c. bottom; are pulled by a magnetic force d. bottom; are pulled by gravity e. bottom; have a greater density than the gel
Where do cold ocean currents generally occur?
a. along the west coast of continents b. near the poles c. near the equator d. along the east coast of continents e. in the open ocean
The first person to use heating processes to preserve foods was ________.
A. Robert Koch B. Jacque Monod C. Louis Pasteur D. Nicholas Appert
Which of the following features is most important for true mosses and ferns to reproduce in the desert?
A) that the sporophytes occupy only permanently shady, north-facing habitats B) that the sporophytes hug the ground, growing no taller than a couple of inches C) either that their gametophytes grow close together, or that they be hermaphroditic D) that the sporophytes have highly lignified vascular tissues E) that the gametophytes contain secondary compounds to deter herbivores