Which of the following is true about antibiotics?
a. In some cases, antibiotics are able to kill pathogenic microbes without harming human cells.
b. Although some antibiotic resistance has been reported, it is not considered a real problem in medicine today.
c. Antibiotics are effective against viruses.
d. Antibiotics are unaffected by enzymes.
Ans: a. In some cases, antibiotics are able to kill pathogenic microbes without harming human cells.
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Four of these five choices are characteristics of sawfly caterpillars. Select the exception
a. vomit in self defense b. prey of birds c. selfish herd d. safety in numbers e. venomous
Males are more commonly affected by X-linked recessive genetic disorders than females because ____
a. females have two X chromosomes; therefore, they do not inherit recessive alleles b. males have only one X chromosome; therefore, they express all recessive X-linked traits c. males have only one X chromosome; therefore, they have multiple alleles for each X-linked gene d. Y chromosomes cause X-linked gene mutations e. males are genetically weaker than females
Characteristics of living organisms are
A. All of the above B. they respond to stimulus C. they grow and develop D. none of the above E. they reproduce
When epidermal growth factor binds to its ________, the receptor phosphorylates itself, triggering a signal transduction pathway.
A. ligand-gated ion channel receptor B. thermoreceptor C. G-protein coupled receptor D. mechanoreceptor E. enzyme-linked receptor