Disease-causing exotoxins are produced by all of the following organisms EXCEPT
A) Clostridium perfringens.
B) Vibrio cholerae.
C) Shigella dysenteriae.
D) Staphylococcus aureus.
E) Clostridium botulinum.
C
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Scientists determined that African elephants are the closest living relatives of the woolly mammoth based on fossil
evidence, because DNA cannot yet be extracted from fossils of extinct species.
a. True b. False
Which of the following syndromes has a karyotype with a missing X chromosome?
A. Jacobs syndrome B. Turner syndrome C. Williams syndrome D. Klinefelter syndrome E. Down syndrome
A drug that can create polyploids is known as ________
A) growth hormone B) astaxanthin C) colchicine D) arrestin E) carrageenan
Which of the following is not an example of an abiotic factor?
A) Temperature B) Energy C) Bacteria D) Nutrients