Which of the following is true when comparing RNA three-dimensional structure to that of DNA?
A. RNA helices are right-handed but not antiparallel like DNA helices.
B. RNA helices are stabilized by base stacking but are not right-handed like DNA.
C. Unlike DNA helices, RNA helices often have additional stabilization by non–Watson-Crick base pairing.
D. RNA helices are less stable than DNA helices because they have regions that are unpaired.
E. RNA helices are antiparallel, stabilized by base stacking, and are left-handed like DNA
helices.
C
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Chloroplasts are composed of membranous sacs called ________ that carry chlorophyll. Surrounding these sacs is a ground substance called ________.
A. grana; stroma B. cristae; stroma C. thylakoid; matrix D. cristae; matrix E. thylakoids; stroma
Nitrogen fixation is used to form ATP, which is then used for energy reserves.
Answer the following statement true (T) or false (F)
In what way are vitamins and essential amino acids similar in human metabolism?
A. Both are integral parts of membrane lipids. B. They cannot be synthesized and must be ingested. C. Both are needed to synthesize steroid hormones. D. They are derived from the same precursor molecules. E. Both contain metal ions.
All mRNA transcripts begin with
a. methionine. b. a ribosome. c. AUG. d. the P site. e. an anticodon.