Muscles differentiate from which tissue?
a. ectoderm
b. endoderm
c. mesoderm
d. somatoderm
e. all of these
Answer: c
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Which of the following is an amine hormone important in the stress response in vertebrates?
A. dopamine B. melatonin C. cortisol D. epinephrine E. serotonin
In which of the following regions is the smallest percentage of the work force engaged in primary activities?
A) South America B) North America C) Africa D) Asia E) Caribbean
Crossing-over ____
a. only takes place towards the middle of chromatids b. can only occur once for each non-sister chromatid c. can only occur once for each homologous chromosome pair d. only takes place between sister chromatids e. can occur at multiple sites in each set of paired chromosomes
Which of the following statements is not true regarding Clostridium difficile?
A. Infection is precipitated by broad-spectrum antibiotic therapy. B. It produces "rice-water" stools. C. It is a gram-positive, endospore-forming rod. D. It is part of the normal intestinal biota. E. It is also called pseudomembranous colitis.