The enzyme that attaches DNA nucleotides at the ends of eukaryotic chromosomes in order to prevent chromosome shortening is called
A. Polymerase.
B. Ligase.
C. Telomerase.
D. Topoisomerase.
E. Primase.
C. Telomerase.
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________ RNA is a component of the ribosomes that serve as the site of protein synthesis.
Fill in the blank(s) with the appropriate word(s).
Conservation biologists are specifically attempting to repopulate _______________ in the
Greater Yellowstone Ecosystem.
a. American chestnut and whitebark pine trees b. bald eagles and Chinook salmon c. black-footed ferrets and prairie dogs d. grizzly bears and gray wolves
Which of the following is true of cardiac muscle?
A. Cardiac muscle tissue has both an intracellular and extracellular source of Ca++. B. Cardiac muscle tissue has slow Ca++ voltage gates in the membrane that make cardiac muscle incapable of tetanus. C. In cardiac muscle tissue, excitation spreads from cell to cell via intercalated disks. D. Cardiac muscle tissue does not require nerve activity to stimulate a contraction. E. All of these are true of cardiac muscle.
Which of the following should I adjust on my microscope if the specimen I am viewing appears very faded or "washed out" from the intense light entering the microscope?
a. Coarse adjustment knob b. Fine adjustment knob c. Iris diaprhagm d. Stage e. Objective lens