The MOST common source of individual foodborne botulism outbreaks are due to
A) honey.
B) dairy products.
C) nonacid, home-canned vegetables.
D) egg and meat salads.
Answer: C
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Put the following events of transcription in chronological order. 1. Sigma binds to the promoter region. 2. The double helix of DNA is unwound, breaking hydrogen bonds between complementary strands. 3. Sigma binds to RNA polymerase. 4. Sigma is released
Put the following events of transcription in chronological order. 1. Sigma binds to the promoter region. 2. The double helix of DNA is unwound, breaking hydrogen bonds between complementary strands. 3. Sigma binds to RNA polymerase. 4. Sigma is released. 5. Transcription begins. A) 2, 3, 4, 5, 1 B) 2, 3, 1, 4, 5 C) 3, 1, 2, 5, 4 D) 3, 2, 1, 4, 5
The clonal selection theory implies that
A. related people have similar immune responses. B. antigens activate specific lymphocytes. C. only certain cells can produce interferon. D. memory cells are present at birth. E. the body selects which antigens it will respond to.
Physiological saline is 0.9 percent NaCl; red blood cells placed in such a solution will not gain or lose
water; therefore, one could state that the fluid in red blood cells is hypertonic.
Indicate whether the statement is true or false.A(n) increase in the pH of the plasma causes hemoglobin to unload its oxygen
____________________ Indicate whether the statement is true or false.