In people with PKU, phenylalanine from dietary proteins cannot be converted to tyrosine
a. True
b. False
Indicate whether the statement is true or false
True
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Four of these statements about conifers are true. Which one is the exception?
a. They form seeds in female cones. b. They have needlelike and scale-like leaves. c. They have a thick cuticle. d. They have motile sperm. e. They are mostly evergreen.
Changes in blood pH are detected by sensory receptors called _________
Fill in the blank(s) with correct word
Motility improved the fitness of these early cells because:
a. It allowed them to make a nuclear envelope. b. It caused them to acquire ribosomes. c. It allowed them to move away from predators and towards food. d. Two of the above. e. None of the above.
What does the p-value represent in a t-test?
A. The probability that the samples have different means. B. The probability that, given the populations have equal means, the differences between sample means were due to chance. C. The percent chance that we can accept the null hypothesis. D. The probability that the alternative hypothesis is correct