The atomic ratio of carbon, hydrogen, and oxygen for most carbohydrates is:
a. 1:2:1
b. 1:2:2
c. 2:1:1
d. 2:1:2
a
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Answer the following statements true (T) or false (F)
1. Translation is a relatively slow process. 2. tRNA contains the genetic code for producing a polypeptide. 3. More than one codon can specify the same amino acid. 4. The termination of translation occurs when a release factor recognizes the stop codon.
Which of the following statements about the placenta is false? a. The mother's body disposes of wastes for both mother and child
b. The placenta begins forming early in pregnancy. c. Maternal and fetal blood mix in the placenta. d. Embryonic blood vessels exchange substances with maternal blood.
The primers in PCR are
a. fragments of mRNA. b designed to base pair with mRNA. c. free nucleotides. d. radioactive. e. none of these.
What is the most common "reward" for butterflies from flowers they pollinate?
A. fruit B. seeds C. honey D. pollen E. nectar