An action potential is a brief reversal of the __________ potential. Fill in the blank(s) with the appropriate word(s)
ANSWER: membrane
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Organisms that require high levels of sodium chloride in order to grow are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).
The structure, function, and assembly of microtubules are regulated by ________ proteins (MAPs).
Fill in the blank(s) with the appropriate word(s).
At least two host races of apple maggots have appeared within the past 150 years, suggesting they may be undergoing
____.
a. parapatric speciation b. allopatric speciation c. sympatric speciation d. genetic drift e. development of a hybrid zone
Round seeds (R) are dominant to wrinkled seeds (r), and yellow seeds (Y) are dominant to green seeds (y). A plant of unknown genotype is testcrossed to a true-breeding plant with wrinkled and green seeds. The offspring produced were 53 round and yellow, 49 round and green, 44 wrinkled and yellow, and 51 wrinkled and green. What is the likely genotype of the parent in question?
A. RRYY B. RrYY C. RRYy D. rryy E. RrYy