Which is not a nucleotide base in DNA?
a. adenine d. thymine
b. guanine e. cytosine
c. uracil f. All are in DNA.
C
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Having a concentration of nerve and sensory cells at the head end is referred to as:
1.bilateral symmetry 2.cephalization 3.coelomate 4.deuterostomate
Which large animals were wiped out by the Cretaceous extinction?
A) mammoths B) dinosaurs C) whales D) sharks
Many bromeliads are epiphytes on the bark of tropical trees. They do not tap into the vascular system of the trees, but they collect the nutrient-rich water that drips through the canopy of the trees. This is an example of:
A) mutualism. B) predation. C) commensalism. D) succession.
Which of the following was a crucial difference between the work of John T. Needham and Louis Pasteur on the question of spontaneous generation?
A. Whether or not the infusions were boiled. B. Whether or not the flasks were sealed. C. Whether meat or infusions were used. D. The length of time the flasks were boiled. E. The method of sealing the flasks.