Which of these is a vitamin A precursor?
a. cobalamin
b. pyridoxine
c. plasmid
d. beta-carotene
e. thiamin
Answer: d. beta-carotene
Biology & Microbiology
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A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Coral reefs found very close to the shore of islands and continents are called:
a. atolls. b. barrier reefs. c. table reefs. d. fringing reefs.
Biology & Microbiology
Which proteins initiate transcription in eukaryotes by recognizing sequences within the promoter region of a gene and attracts RNA polymerase?
A. repressors B. transcription factors C. inducers D. poly-A tails E. TATA boxes
Biology & Microbiology
Botox injections contain botulinum toxin.
Answer the following statement true (T) or false (F)
Biology & Microbiology