Which phylum consists of diploblastic animals with radial or biradial symmetry?
a. Cnidaria
b. Parazoa
c. Platyhelminthes
d. Mollusca
a. Cnidaria
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The prebiotic soup hypothesis proposes that organic molecules formed from cracks in the ocean floor
______________ Indicate whether the statement is true or false.
Which one of the following correctly describes the way in which DNA works?
A. DNA makes RNA and RNA changes into protein. B. DNA makes amino acids which form ribosomes. C. DNA makes mRNA which directs where tRNA places amino acids. D. DNA makes mRNA which manufactures amino acids which attach to tRNA.
Nutrient absorption mostly happens in the ____
a. stomach b. small intestine c. colon d. pancreas e. esophagus
A pro- strain of bacteria, which has not been in contact with any other strains, develops the ability to produce the amino acid proline. This mutant "rescue" could have been caused by
A. addition of the pro+ gene via transformation. B. mutation of the pro- gene during phage integration. C. correction of the pro- gene by reverse transcriptase. D. addition of the pro+ gene via transduction. E. removal of the pro- gene during excision.