Which animals were the 1st to be genetically modified?
a. Mice
b. Monkeys
c. Dogs
d. Pigs
e. Cows
a
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What explanation can you give for why the sodium-potassium pump does not run out of ions to move in or out of the cell?
A. The cell continuously produces more ions to replace those moved by the pump, maintaining a constant supply. B. Leak channels are always open, allowing the passage of sodium ions (Na+) and potassium ions (K+) across the membrane. C. Many of the ions moved in or out then diffuse passively back through the membrane in the opposite direction.
Cotyledons develop as part of _____
a. carpels c. embryo sporophytes b. accessory fruits d. petioles
All of these animals are mollusks except
A. chitons. B. scallops. C. squids and octopuses. D. flatworms. E. terrestrial snails and slugs.
The increased reliance on genetically engineered crops grew from the need to ____
a. develop new species of crop plants b. provide farmers with more expensive seeds c. find new pesticides d. produce more food at lower cost without harming the environment
e. find more ways to profit from crop plants