Alpha helices and beta pleated sheets are examples of:
A) tertiary structure. B) secondary structure.
C) primary structure. D) quaternary structure.
Answer: B
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The openings to the ___________ system (respiratory system) in insects are termed _________.
A. spiracle, tracheae B. tracheal, bronchi C. spiracle, alveoli D. tracheal, spiracles E. tracheal, stomata
The formation of peptide bonds during translation is catalyzed by ____ found in the ____
a. RNA polymerase; large ribosomal subunit b. peptidyl transferase; small ribosomal subunit c. peptidyl transferase; large ribosomal subunit d. aminoacyl-tRNA synthetase; small ribosomal subunit e. aminoacyl-tRNA synthetase; tRNA
Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?
A. Cells continue to grow as long as there is adequate space. B. The controls on cell growth and division can be turned on and off. C. When cells come into contact with other cells, they stop growing. D. Cell division can be regulated by factors outside of the cell. E. All of the answer choices are correct.
A complex consisting of a single mRNA molecule with several ribosomes is called a ________.
A. polysome B. proteosome C. maxisome D. multisome