Two plant species live in the same location and flower at the same time, but do not hybridize because they have
unique pollinators. This is an example of ____.
a. hybrid inviability
b. hybrid breakdown
c. a postmating reproductive mechanism
d. a postzygotic reproductive barrier
e. a prezygotic reproductive barrier
ANSWER: e
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Common spermicidal preparations have a toxic effect on Lactobacillus species and are associated with increased risk of urinary tract infection. Which of the following statements best explains this observation?
A. Production of spermicidal chemicals must be rigorously controlled to avoid contamination with organisms like E. coli. B. Lactobacillus can cause urinary tract infections when transferred from the reproductive system to the urinary system. C. Use of spermicide must be carefully monitored so that it doesn't inadvertently enter the urinary tract. D. Without the protective coating of Lactobacillus, organisms like E. coli can attach to bladder epithelial cells.
In which of the stages below does each
chromosome consist of two DNA molecules? I. metaphase II. telophase III. prophase IV. anaphase a. III and IV b. I, III, and IV c. I and III d. I, II, and III e. I, II, III, and IV
Which of the following are lipids?
a. steroids b. triglycerides c. oils d. waxes e. all of these
GM plants that are in various developmental pipelines include those that are ________
A) tolerant of radiation exposure B) tolerant of increased salinity C) incapable of recombination D) tolerant of heavy metals