Which one of the following is a type of species interaction with impacts that depend on prey density and effectiveness of defenses to determine the short-term impact on the prey population?
A) competition
B) consumption
C) mutualism
D) commensalism
Answer: B
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Sam and Richard work at the local glue factory. Recently, Sam, who is a more experienced worker, has begun to establish a protégé-mentor relationship with Richard. As this process has just begun, it is best characterized as being in the ____ phase.
Fill in the blank(s) with the appropriate word(s).
A researcher is looking for met- strains. He/she compares two plates. One plate has colonies growing
on complete medium. The other plate has colonies growing on methionine deficient medium. How can the researcher determine which colonies are met-?
a. The colonies growing on the methionine plate are met-. b. met- colonies grow on the complete medium but do not grow on the plate lacking methionine. c. We cannot determine which colonies are met- because we do not have enough information. d. Only the colonies growing on the complete medium are met-. e. met- colonies grow on the plate lacking methionine but do not grow on the complete medium.
In transcription,
a. several amino acids are assembled by the messenger RNA molecules at one time. b. a special sequence called a promoter is necessary for transcription to begin. c. certain polypeptide sequences are governed by one ribosome, whereas other sequences are produced by multiple ribosomes. d. the transfer RNA molecules arrange the messenger RNA codons into the appropriate sequence. e. all of these occur.
Photosynthetic bacteria are examples of autotrophs
Indicate whether the statement is true or false