What is the structural component of coral reefs?
a. calcium phosphate secretions by coral polyps
b. calcium carbonate secretions by coral polyps
c. dinoflagellate bodies
d. calcium phosphate secretions by dinoflagellates
e. calcium carbonate secretions by dinoflagellates
b
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Place the following events of bacterial conjugation in order from first to last.
1 - DNA replication 2 - an enzyme joins F factor DNA ends 3 - sex pilus shortens 4 - DNA transfer 5 - an enzyme cuts F factor DNA A. 1, 2, 3, 4, 5 B. 3, 5, 4, 2, 1 C. 5, 1, 3, 4, 2 D. 3, 5, 1, 4, 2 E. 3, 5, 1, 2, 4
Four of these factors play a role in phylogeny. Which one does not?
a. number of digits b. DNA sequence for a gene c. amino acid sequence of an enzyme d. number of petals e. number of individuals
The coexistence of competitors due to differences in the range of resources used or environmental tolerances is referred to as niche ________
Fill in the blank(s) with correct word
Which of the following does not contribute to the maintenance of homeostasis in mammals?
a. sweat glands b. the digestive system c. lungs d. specialized gill cells e. the kidneys