Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Franklin
B. Chargaff
C. Hershey and Chase
D. Meselson and Stahl
E. Watson and Crick
Answer: E
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Which of the following is the correct order of taxa from most inclusive to least inclusive?
a. domain, kingdom, phylum, class, order, family, genus, species b. domain, kingdom, phylum, order, class, family, genus, species c. domain, kingdom, phylum, family, order, class, genus, species d. domain, phylum, kingdom, class, order, family, genus, species e. domain, kingdom, order, class, phylum, family, genus, species
Meiosis may pause at which point in the cycle?
a. after DNA is replicated in S phase but before meiosis I begins b. after meiosis I is complete c. after prophase II d. before telophase II e. after prophase I
The skin inhibits bacterial growth by releasing
A) lysozyme. B) macrophages. C) T cells. D) white blood cells. E) lactic acid.
A change in a single amino acid can change the structure and function of an entire protein. However, in some cases, there can be gene mutations, which change an amino acid in a protein structure but do not change either the overall shape or function of a protein. In cases like these, which level(s) of protein structure would change?
A. none B. primary, secondary, tertiary, and quaternary C. secondary and tertiary D. primary