What is the name of the class of enzymes that will recognize a specific sequence of DNA and cut it?
A. DNA polymerases
B. topoisomerases
C. restriction endonucleases
D. helicases
E. primases
C
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Kisspeptin is a protein (coded for by the KISS-1 gene) that in humans has an important role in initiating secretion of gonadotropin-releasing hormone (GnRH),
a hormone that stimulates the anterior pituitary gland to release other hormones related to reproduction. Endocrinologists are finding that the protein kisspeptin and its receptor are central to sexual maturation at puberty. The receptor for kisspeptin is coded for by the gene GPR54. Given the information above, the product of GPR54 is: A. a steroid. B. an intracellular protein. C. an extracellular protein. D. an amine. E. a transmembrane protein.
A protein combined with cholesterol in the blood is an example of a(n) ____
a. irregular protein b. lipoprotein c. glycoprotein d. denatured protein e. collagen
____is used within the cell’s membrane and as a precursor to other steroids synthesized by cells.
DNA replication and gene expression in archaeans more closely resemble eukaryotic cells than the same processes in bacteria. However both Bacteria and Archaea are prokaryotic. What does this suggest?
A. Eukaryotic cells are descended from modern Archaeans. B. There must have been 2 origin events, one producing the bacteria and the other producing Archaeans and eukaryotic cells. C. Bacterial cells are not related to Archaeans. D. Eukaryotic cells shared a more recent common ancestor with Archaeans than with bacterial cells.