RNA directly involved in producing proteins are ribosomal RNA (rRNA), _______ RNA (mRNA), and ________ RNA (tRNA).
Fill in the blank(s) with the appropriate word(s).
messenger; transfer
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A testcross determines phenotype
__________________ Indicate whether the statement is true or false.
The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation. b. reduce the amount of visible light reaching Earth c. provide plants with nitrogen needed for photosynthesis d. protect Earth from microwave radiation e. protect Earth from most ultraviolet radiation
A bacteriophage that can integrate its genome into the host chromosome and not cause lysis of the host cell is said to be ________.
A. temperate B. virulent C. avirulent D. moderate
After binding to an infected cell, the cytotoxic T cell
A) releases histamine. B) becomes a phagocytic cell. C) neutralizes the infecting bacteria or viruses. D) releases a protein called perforin.