Chromatids are
a. attached at the centriole.
b. a pair of chromosomes, one from the mother and one from the father.
c. attached to the nuclear envelope.
d. identical before and after crossing over occurs.
e. identical until crossing over occurs.
ANSWER: e
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Oxygen has an atomic number of 8. This
means that oxygen has 8
a. electrons in its outer most shell. b. neutrons in its nucleus. c. protons and 8 neutrons in its nucleus. d. protons in its nucleus. e. neutrons in its outer shell.
Sharks excrete a small volume of dilute urine
____________________ Indicate whether the statement is true or false.
The scientific method has varying levels of certainty. Which of the following terms has the lowest level of certainty?
a. conclusion b. theory c. observation d. hypothesis
____ food chains tend to predominate in aquatic ecosystems.
A. Higher trophic level B. Primary consumer C. Decomposing D. Grazing E. Detrital