Feeding chickens a strain of Bacillus subtilis leads to
A. increased body weight and feed conversion.
B. lower carriage of the pathogenic E. coli strain O157:H7.
C. a reduction in coliforms and Campylobacter in the processed carcasses.
D. increased body weight and feed conversion and a reduction in coliforms and Campylobacter in the processed carcasses.
E. All of the choices are correct.
Answer: E
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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.
Although some bacteria have membranes around their DNA, we do not call these structures nuclei because they lack
____.
a. pores b. proteins c. phospholipids d. a bilayer construction e. ribosomes
Why does the sarcomere get narrower during muscle contraction?
A. The myosin fiber shrinks. B. The myosin and actin fibers overlap more. C. The edges of the muscle push the cells closer together. D. The actin fiber shrinks. E. The sarcoplasmic reticulum empties.
Which of the following processes does not use ATP?
A. active transport B. diffusion of oxygen into the blood C. muscle contraction D. cytoplasmic transport E. heat production