The two strands of the DNA double helix are held together by
A) 5' to 3' attraction.
B) hydrogen bonds between nucleotide bases.
C) codons.
D) peptide bonds between nucleotide bases.
Answer: B
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Which of the following is formed last in the transfer
of solar energy? a. H+ b. excited electrons c. ATP d. O2 e. NADPH
What statement is correct in the following statement?
A. Speciation that begins with geographic isolation is known as allopatric speciation. B. Allopatric speciation only happens in dispersal geographic isolation. C. Speciation that begins with geographic isolation is known as sympatric speciation. D. Sympatric speciation only happens in dispersal geographic isolation.
Since the botulism toxin is a protein and is sensitive to denaturation, botulism food poisoning could be easily prevented by:
a. administration of antibiotics b. boiling the food prior to consumption c. prevention of fecal contamination d. nothing; botox cannot be neutralized
The necessity for elaborate sterilization procedures in hospitals and canneries is due to
a) endospores. b) fungal spore. c) vegetative cells. d) protozoan cells. e) viruses.