In response to the presence of endotoxin, phagocytes secrete tumor necrosis factor. This causes
A) the disease to subside.
B) a decrease in blood pressure.
C) a fever.
D) a gram-negative infection.
E) an increase in red blood cells.
B
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To enhance the efficiency of transformation, bacterial cells can be induced to take up DNA by a strong electrical field
Indicate whether the statement is true or false
Amino acids are attached to their tRNA molecules by which of the following?
a. hydrogen bonds b. aminoacyl-tRNA synthetases c. RNA ligase d. peptide bonds
Which of the following describes the role of urinary systems in maintaining cellular homeostasis?
A) Urinary systems filter out diseased and damaged cells that can be excreted from the body. B) Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells. C) Urinary systems ensure the delivery of the proper amount of nitrogen to the cells. D) Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.
In sexual reproducers, meiosis gives rise to _____________.
A. diploid gametes B. haploid gametes C. triploid gametes D. haploid germ cells E. diploid germ cells