A plant secretes ____ when it needs to respond
defensively to a pathogen.
a. salicylic acid
b. systemin
c. brassinosteroids
d. mineralocorticoids
e. nitric oxide
A
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Map distances (and recombination frequencies) are additive
A. for all distances between genes in a chromosome. B. for distances up to about 75 map units, after which recombination frequencies become higher than expected. C. for distances up to about 50 map units, at which point recombination frequencies become higher than expected. D. for distances up to about 25 map units, at which point recombination frequency becomes higher than expected. E. for distances up to about 15 map units, at which point recombination frequency becomes lower than expected.
Why do plasmids make such excellent cloning vectors?
a. They are small and circular. b. They each have hundreds of restriction endonuclease cut sites. c. They replicate independently of the chromosomal DNA. d. They have uracil instead of thymine.
Refer to the paragraph on dark-eyed junco birds. The UCSD campus male junco population tails were, on average, 36% white, whereas the tails of males from nearby mountain populations averaged 40-45% white
If this observed trait difference were due to a difference in the original colonizing population, it would most likely be due to _____. A) mutations in the UCSD population B) gene flow between populations C) a genetic bottleneck D) a founder effect
The polymerase chain reaction relies upon unusual, heat-resistant ________ that were isolated from bacteria living in hot springs
A) DNA polymerases B) DNA ligases C) restriction enzymes D) plasmids