Which statement about prokaryotic gene expression is true?
a. RNA transcription and protein translation occur almost simultaneously.
b. Gene expression is regulated primarily at the epigenetic level.
c. Prokaryotic organisms have intracellular organelles.
d. RNA post-processing includes the splicing of exons.
a. RNA transcription and protein translation occur almost simultaneously.
You might also like to view...
When reporting a direct smear from a primary specimen, it is important to note all of the following except:
a. white blood cells. b. squamous epithelial cells. c. artifacts. d. prominent cell shapes and arrangements.
How do lipid insoluble hormones affect targets within the cell?
a. They bind to channel proteins for transport into the cell. b. They hydrolyze receptors for lipid soluble hormones, blocking their action. c. They trigger the release of a second messenger in the cytoplasm. d. Lipid insoluble hormones are synthesized and remain inside the cell.
The potential energy that an inactive neuron maintains as a result of its polarized membrane is called the _________ potential.
Fill in the blank(s) with the appropriate word(s)
One of the first steps in obtaining a karyotype (such as that shown below of a cancer cell) is treating cells with a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?
A. Only mitotic chromosome DNA is separated into single strands, allowing for staining by dyes. B. Only in mitosis are homologous chromosomes paired up. C. Only mitotic chromosomes are highly condensed and visible with a light microscope. D. Only mitotic cells contain homologous chromosomes, because mitosis happens after DNA replication.