Which of the following is a characteristic of uracil?
a. The ability to bond with adenine.
b. The ability to bond with guanine.
c. It is a purine.
d. The ability to bond with cytosine.
e. It contains two nitrogenous rings
A
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Some protists bear a small number of external cellular structures that facilitate swimming by repeatedly bending and straightening. These protists are informally known as:
A. amoebae B. ciliates C. algae D. periphyton E. flagellates
What is the natural function of restriction endonucleases?
a. research applications b. DNA manipulation in vitro c. defense against viruses that infect bacteria d. regulating bacterial gene expression e. breaking phosphodiester bonds in mammalian DNA
the gene that codes for the testis-determining factor (TDF) is found in or on
What will be an ideal response?
The complex of periplasmic flagella that mediates the movement of spirochetes is referred to as the ________.
A. axillary filament B. periplasmic flagella C. periplasmic flagella or axial filament D. peritrichal axon E. axial filament