In general, most antibiotics work by:
A) boosting the human immune system.
B) preventing viruses from entering human cells.
C) preventing bacteria from entering human cells.
D) exploiting differences between human and bacterial cells.
Answer: D
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Consider Mendel's experiments involving the trait of round versus wrinkled peas
In some experiments, Mendel's method involved removing the anthers that produce pollen from the flowers of the round peas and applying pollen from the anthers of the wrinkled plant. What would have happened if Mendel had missed some anthers he was trying to remove from the flowers of the plants that produce only round peas, and observed the peas produced by a plant that had a mix of round and wrinkled pollen? (Indicate which of the following MUST be true.) Comments: This problem is more complicated that it might appear at first. For example, if the parent with some of its own anthers and some introduced pollen has a phenotype that results from a homozygous dominant genotype, the F1 would all appear to have the dominant phenotype even if some recessive pollen grains were introduced. However, if the parent had a recessive phenotype and mixed pollen, the results would differ. Remember, the 9:3:3:1 ratio is when two different genes are involved. A. The F1 peas produced would have mixed phenotypes. B. The F1 peas produced would have a single phenotype. C. The F2 peas would have phenotypes in a 9:3:3:1 ratio. D. The F2 peas would all have the phenotype of the parental plant with the anthers not properly removed. E. The F1 peas would have phenotypes in a 1:1 ratio.
A distinguishing feature of Lepidosauria is their:
A. hard shell B. kinetic skull C. external fertilization D. shell-less eggs E. none of the choices provided
Which backyard would you predict to have the greatest diversity of birds?
A) one with newly planted seedlings B) one with 5- to 10-year-old trees C) one with 25- to 50-year-old trees D) one with 60- to 100-year-old trees
The broad band of loose connective tissue beneath the mucosa that contains blood vessels, lymph, and nerves is called the
A. muscularis. B. submucosa. C. mucosa. D. serosa. E. diverticulosis.