Eukaryotes originated after the rise in atmospheric oxygen
Indicate whether the statement is true or false.
Answer: TRUE
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By one hypothesis, clay _____
a. facilitated assembly of early organic polymers by concentrating monomers through it's negative charge b. was present at hydrothermal vents c. provided energy for early metabolism d. has a positive charge and repelled organic monomers e. helped physically form the plasma membrane of protocells
Four of the five answers listed below are characteristics of cnidarians. Select the exception
a. ciliated larvae b. polyp form c. jellylike matrix d. nematocyst e. pharynx
The most common food allergens are
a. tomatoes, peppers, and eggs. b. eggs, milk, and strawberries. c. oranges, pineapples, and shellfish. d. shellfish, tomatoes, and cheese. e. shellfish, eggs, and wheat.
Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances will perforate plasma membranes. D. Radioactive substances decay.