Electrophoresis separates DNA fragments on the basis of ____
a. molecular charge
b. molecular bonding
c. molecular size
d. polarity
e. nonpolarity
ANSWER: c
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Which stomach chamber is found in ruminants but not pseudo-ruminants?
a. omasum b. abomasum c. rumen d. reticulum
A protein becomes distributed in a gradient along the length of the egg. As development continues, orientation of this gradient determines which part of the embryo will become the front of the animal, and which will be the back. This is an example of ____
a. germ layer formation b. gastrulation c. gradient development d. embryonic induction e. gene expression
Which of the following pairs is incorrectly matched?
a. highly developed countries?infant mortality rate close to 7 per 1000 b. moderately developed countries?fertility rate near 2 c. less developed countries?fertility rate near 5 d. worldwide?27% of the population is less than 15 years old e. United States?doubling time 100 years
When referring to density, which is the correct equation?
a. density=length/total volume b. density=displaced volume/mass c. density=mass/displaced volume d. density=mass/total volume