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