Outside the protein sheath, many viruses have a(n) _______ made of protein, lipid, and carbohydrate.
Fill in the blank(s) with the appropriate word(s).
envelope
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In the cell cycle, the G1 phase represents ____
a. the stage of DNA synthesis b. splitting of the chromosomes into chromatids c. a period of growth d. the stage of actual cell division e. the stage just prior to meiosis
If a person were born with the inability to produce pepsin, how would this affect his or her digestion?
A) He or she could not break down lactose. B) He or she would digest proteins with difficulty. C) He or she would fail to metabolize glucose. D) He or she would no longer be able to absorb DNA.
Which of the following best describes IgM antibodies?
A. They cause basophils and eosinophils to degranulate. B. They are the most common type of antibody in the blood during the initial stages of an immune response. C. They are the antibody class found in body secretions. D. They interact with phagocytes and NK cells. E. They can cross the placenta to provide passive immunity.
Most doctors believe that probiotics, such as Bifidobacterium,
a. have great therapeutic potential. b. are a good alternative to fecal transplants. c. have limited therapeutic potential. d. should be taken at the same time as antibiotics.