Enterotoxins are ________.
A. proteins
B. exotoxins
C. toxins that target the intestines
D. virulence factors
E. All of the choices are correct.
Answer: E
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In experiments to show that DNA is the genetic material, Hershey and Chase labeled DNA with radioactive
A) amino acids. B) sulfur. C) phosphorus. D) carbon.
What is the function of the osmotic gradient found in the kidney? The osmotic gradient allows for _____
A) electrolytes to move from low to high concentrations in the absence of ATP B) the precise control of the retention of water and electrolytes C) the loop of Henle to deliver water to the renal vein D) the filtration of large cells at the glomerulus
Aside from the genetic material, which cell component from the sperm has a function in the fertilized egg?
A. Mitochondria B. Ribosome C. Lysosome D. Centriole E. RNA
Which of the following is an assimilation process?
A) Thiobacillus: H2S ? S0 B) Desulfovibrio: SO42- ? H2S C) Proteus: Sulfhydryl-containing amino acids ? H2S D) Redwood tree: SO42- ? Sulfhydryl groups of amino acids E) Photosynthetic bacteria: H2S ? S0