Answer the following statements true (T) or false (F)
1. If a cell contains 20 units of DNA during G2, it will have 40 units of DNA during S.
2. During prometaphase, the sister chromatids organize into a single row in the center of the cell.
3. A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid.
4. One major difference between metaphase I and metaphase II is the presence or absence of bivalents.
5. Sexual life cycles include both haploid and diploid stages.
1. FALSE
2. FALSE
3. TRUE
4. TRUE
5. TRUE
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Which of the following mechanisms may be responsible for the occurrance of exon shuffling?
A. double crossover could promote the insertion of an exon into another gene. B. nonhomologous recombination. C. transposable elements may promote the movement of exons. D. both nonhomologous recombination and transposable elements. E. none of these are mechanisms responsible for exon shuffling.
A principal role of the clinical microbiologist includes:
a. quickly and accurately communicating information about the patient in both ver-bal and written formats. b. assisting nurses and/or phlebotomists on the floor when drawing blood cultures. c. diagnosing and treating patients. d. designing software for microbial databas-es.
The most dangerous outcome of a Taenia solium infection occurs when
A. larvae cross the placenta. B. eggs are ingested. C. larvae enter the body through intact skin. D. cysticerci are ingested. E. the host immune system fails to react against it.
A study of ____ indicated a connection between lower melatonin levels and a greater risk of breast cancer
a. ER nurses b. college students c. high stress occupations d. night-shift nurses e. infants in high altitudes