The voltage of 70 millivolts that exists across the nerve cell membrane is caused by the
A. depolarization of the cell membrane.
B. active transport of sodium ions out of the cell.
C. diffusion of potassium ions into the cell.
D. acetylcholine binding to the dendrite.
B. active transport of sodium ions out of the cell.
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Most known plant viruses have ________-strand RNA genomes, because small genomes ________
A) negative / facilitate cell-to-cell transfer B) positive / facilitate cell-to-cell transfer C) negative / interact more readily with host DNA D) positive / interact more readily with host DNA
One important advantage of eukaryotic cells as hosts for cloning vectors is that they already possess the complex RNA and posttranslational processing systems required for the production of eukaryotic proteins
Indicate whether the statement is true or false.
Toxinoses are _____
a. especially deadly toxic substances produces by parasites b. diseases caused by toxins produced by other organisms c. a third class of toxins, along with endotoxins and exotoxins
Which of the following is not part of sexual reproduction?
a. The segregation of homologous chromosomes during gamete formation b. The fusion of sister chromatids during fertilization c. The fusion of haploid cells from a diploid zygote d. The reduction in chromosome number during meiosis e. The production of genetically distinct gametes during meiosis