_______ live within and provide energy for the reef-building coral animals, whose efforts support diverse and beautiful coral reef communities.
Fill in the blank(s) with the appropriate word(s).
Ans: Dinoflagellates
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Which of the following is not true of the second step of translational elongation in bacteria?
A. The carboxyl group oxygen of the A-site amino acid is the nucleophile in peptide bond formation. B. A peptide bond is formed between the two amino acids bound by the tRNAs in the A and Psites. C. The growing polypeptide chain is transferred to the tRNA in the A site. D. The ?-amino group of the A-site amino acid attacks the carbonyl carbon of the P-site amino acid.
Ribozymes may have originally developed by ____
a. ATP synthesis b. the chance assembly of RNA molecules c. cellular respiration d. glycolysis e. electron transfer systems
Pheromones are a type of ________ signal
a. mechanical b. chemical c. tactile d. auditory e. physical
When a person is tested for HIV, the test is considered positive if _______ to the HIV are present.
A. bacteria B. antigens C. antibodies D. T-cells E. natural killer cells