What is the difference in the bonding between alpha-helix and beta sheets?
A. Hydrogen bonding between the amides only occurs in one of these two types of secondary structures.
B. Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices.
C. Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets.
D. Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets.
B
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Which one of the following is the correct classification of vertebrae, from the skull to the pelvis?
A) sacral, coccygeal, lumbar, thoracic, cervical B) cervical, thoracic, lumbar, coccygeal, sacral C) cervical, thoracic, lumbar, sacral, coccygeal D) coccygeal, thoracic, lumbar, sacral, cervical E) coccygeal, thoracic, lumbar, cervical, sacral
The scientific name of the American copperhead is Agkistrodon contortrix and the scientific name of the Australian pygmy copperhead is Austrelaps labialis. Based on this information, which of the following statements is true?
A. The common name "copperhead" must mean the two snakes are closely related. B. Both copperheads are the same species. C. Both copperheads are classified in the same genus. D. None of the above are correct.
What is the benefit of sexual reproduction in protists?
A) fast increase in numbers B) availability of more environments C) greater variation among offspring D) ease of finding a mate
Short, bristle-like structures that extrude from the cell surface are called
A) flagella. B) pili. C) mating bridges. D) fimbriae. E) cilia.