The finding that virtually all organisms use the same genetic code provides the basis for declaring that the code is universal. Name at least two exceptions to such universality
What will be an ideal response?
mitchondrial DNA; Mycoplasma capricolum; some protozoans
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An invertebrate, such as an insect, has innate immunity activity in its intestine that likely includes _____
A) a complement B) lysozyme C) mucus D) neutrophils E) dendritic cells
A gram-positive Bacillus, which is c-hemolytic on 5% sheep blood agar, produces a wide zone of lecithinase on egg yolk agar, is nonmotile, and was isolated from the stool of a patient with abdominal pain and watery diarrhea. Because of the patient's existing immunocompromised state, the physician administered penicillin as the antibiotic therapy. The patient's condition did not improve after 7
days of treatment. Which one of the following statements explains the reason for the antibiotic failure? a. The course was too abbreviated and should be given for 14 days. b. The patient may be allergic to penicillin and its therapeutic effects. c. Penicillin is ineffective against gram-positive organisms. d. The organism produces c-lactamase, which renders the drug inactive.
The Cambrian explosion refers to Earth's historical benchmark of life involving the
A. appearance of fossils for all major phyla of animals. B. origination of life, when the progenotes formed the first cells. C. All of the answer choices are correct. D. mass extinction of the nonavian dinosaurs. E. development of the first multicellular organisms.
The animals pictured here are
1.chelicerates
2.myriapods
3.crustaceans
4.arachnids