Which of the following CANNOT be repaired by nucleotide excision repair (NER)?
A. chemically modified bases
B. ultraviolet-induced damage
C. missing bases
D. mismatched bases
E. pyrimidine dimers
Answer: D
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A gene library from a particular human's retinal cell would be a collection of _____
A) DNAs cut by a restriction enzyme B) plasmids cut by a restriction enzyme C) different DNA fragments ligated into different plasmids D) genes that have been sequenced from a particular organism E) PCR-amplified DNAs
Gram-negative bacteria
A. appear purple following the Gram stain. B. include all pathogens. C. are generally more susceptible to antibiotics than gram-positive bacteria. D. have a more complex cell envelope with a greater variation in chemical composition.
Which molecule(s) need a transport protein to cross the cell membrane?
a. water b. carbon dioxide c. glucose d. oxygen e. carbon dioxide and water
Which process does not occur in ecosystems?
A) Energy flows through the system. B) Carbon is cycled between biotic and abiotic forms. C) Producers convert light energy to chemical energy. D) Consumers directly use the energy source that powers the system.