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.
Answer: B
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Xylem and phloem are types of
a. ground tissue. b. protoderm. c. vascular tissue. d. meristem. e. dermal tissue.
Which of the following statements is TRUE?
a. Each new cell receives half of the number of chromosomes in the original cell. b. Each new cell receives copies of all the original chromosomes. c. If the original number of chromosomes was 46, each new cell will have 23. d. The sister chromosomes are not identical due to breakages in the DNA. e. All chromosomes are duplicated except the sex chromosomes.
Mendel’s pea plants made good experimental subjects because they ____
a. exhibit continuous variation b. exhibit a variety of inheritance patterns c. exhibit discontinuous variation and complete dominance d. are sterile e. have many complex traits that are easy to resea
You have curly hair, and your brother has straight hair. Describe how the proteins of your curly hair are different from the proteins of his straight hair
What will be an ideal response?