Astop codon
codes for no amino acid.
codes for the stop amino acid s-methyl-methionine and forms a hairpin loop forcing the ribosome to fall off.
enhances the binding of the e-polymerase.
codes for the stop amino acid s-methyl-methionine.
forms a hairpin loop forcing the ribosome to fall off.

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.