A sheepherder has a large black and necrotic lesion (eschar) under his chin that has grown quickly in size. There is no pus, but the patient complains of painful and swollen glands. A gram-positive bacillus is isolated from the lesion. Which of the following features of the responsible agent is NOT a virulent Factor?
A. capsule
B. endotoxin
C. Lethal toxins
D. Spore formation
Ans: B. endotoxin
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Which of the following is a use for GMOs?
A. chickens that produce eggs containing antibodies to help fight bacteria B. rice that contains vitamin A C. sugar cane with increased sugar content D. corn that is resistant to disease E. All of the answer options are correct.
A researcher might use site-directed mutagenesis because
A) spontaneous mutations occur too frequently to study. B) using a mutagen yields results that are specific to a gene and not applicable everywhere in the genome. C) mutation can happen at a specific site in the genome, compared to a mutagen that might cause mutations in several genes. D) it works in humans but not in experimental organisms or cell culture.
Which of these exhibits radial symmetry?
A) butterfly B) spoon C) snowflake D) shoe box
Cells of the innate immune system, such as macrophages, initiate an adaptive immune response due to their
a. phagocytic function. b. endocytic function. c. antigen presenting function. d. antibody presenting function.