Four of the five plant activities listed below are
affected by phytochrome. Select the exception.
a. phototropism
b. stem elongation
c. seed germination
d. leaf movement
e. formation of flowers, fruits, and seeds
Answer: a
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What protein causes an autoimmune reaction in people with celiac disease?
a. wheat b. gluten c. fiber d. bran e. oleic acid
How many unique mRNA codons can be constructed from the four different RNA nucleotides?
A. 61 B. 64 C. four D. 12 E. 16
The earliest Homo sapiens fossils are ca. 200,000 years old. Could you use radiocarbon dating to determine the age of fossils from that period? Briefly justify your answer in the space provided below
What will be an ideal response?
What feature distinguishes all hormones from neurotransmitters?
A. Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell. B. Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations. C. Hormones are steroids, while neurotransmitters are amino acids. D. A hormone affects reproductive functions, while neurotransmitters control all other processes.