Known as the "cell from hell," what toxin-producing dinoflagellate is responsible for significant fish kills in the mid-Atlantic region?
A) Vibrio cholera
B) Conus magus
C) Crassotrea virginica
D) Mytilus edulis
E) Pfiesteria piscicida
E
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Erwin Chargaff's research determined the composition of the nitrogen bases within a strand of DNA. His work determined that
A. the percent of adenine is equal to the percent of thymine and the percent of cytosine is equal to the percent of guanine. B. the concentrations of adenine, thymine, guanine, and cytosine are all equal. C. the concentration of adenine is twice the concentration of thymine and the concentration of cytosine is twice the concentration of guanine. D. the percent of adenine is equal to the percent of guanine and the percent of cytosine is equal to the percent of thymine.
Water-soluble hormones
a. have to be transported by specific protein carrier molecules in the blood. b. have no trouble entering the target cells. c. find and react with the cell lipid bilayer. d. always elicit the production of a second messenger. e. are the same as lipid soluble.
In respiration, which one of the following is not done directly by the electron transport chain (or its components)?
a. carry electrons b. carry protons c. pump hydrogen ions across the inner mitochondrial membrane d. regenerate (oxidized) NAD+ e. add a P to ADP, making ATP
Which of the following is part of the apoplast?
A. Cell wall B. Plasma membrane C. Plasmodesma D. Cytoplasm