The cell walls of bacteria are responsible for the shape of the bacteria and the difference in the Gram stain reaction
Indicate whether the statement is true or false
TRUE
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PCR typically results in the generation of fragments of all sizes
Indicate whether this statement is true or false.
Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which phylum?
a. Nematoda b. Ctenophora c. Nemertea d. Porifera e. Cnidaria
Suppose that a DNA change results in the substitution of one codon for another, but the codon specifies the same amino acid as it did originally. What type of mutation has occurred?
a. a chromosomal mutation b. a frameshift mutation c. a silent mutation d. a missense mutation
The scarcity of which two elements limits plant growth?
A. nitrogen, phosphorus B. oxygen, nitrogen C. oxygen, phosphorus D. carbon, phosphorus E. carbon, nitrogen