The first fossils of animals date back to
approximately ___ million years ago.
a. 370
b. 420
c. 470
d. 520
e. 570
E
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A set of three consecutive bases in mRNA is known as a(n) ____
a. doublet b. codon c. anti-codon d. codex e. tri-codon
Why is a woman more susceptible to vaginal yeast infections when taking antibiotics?
A) The antibiotic serves as nutrition for the infectious yeast. B) All vaginal bacteria are killed by the antibiotic and can't competitively exclude the yeast. C) Her immune system is already not functioning well due to previous infections. D) Antibiotics are lethal to most types of yeast.
A major human cultural innovation that happened about 10,000 years ago was the
A) use of tools. B) development of self-expression in art forms. C) development of domesticated crops and livestock. D) development of language. E) ability to think in abstract terms.
A group of patients was seen on an emergency basis complaining of abdominal craps and watery diarrhea within 5 hours of attending a picnic in which ham, potato salad, and custard-filled pastries were on the menu. Which of the following is the likely cause of this disease?
A. Attachment and disruption of intestinal lining due to parasitic infection B. Bacterial colonization and toxin production C. Bacterial adherence and invasion D. Performed bacterial toxin E. Replication of virus that prevents reabsorption of water