These antibodies stay attached to the B cell's plasma membrane and serve as receptors for binding with antigen or complement
a. IgA
b. IgG
c. IgM
d. IgE
e. Both IgE and IgA
c
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The synaptonemal complex forms in which subphase of prophase I of meiosis?
A) leptotene B) zygotene C) pachytene D) diplotene E) diakinesis
Cells that comprise ____ tissue have gap junctions, a single nucleus, and many mitochondria; in addition, this tissue is
striated and functions involuntarily.
a. skeletal muscle b. smooth muscle c. cardiac muscle d. striated columnar epithelium e. more than one of these
Which of the following correctly matches the vessel to the oxygen status of the blood that it contains?
A. Endometrial Vein - Low O2 B. Intervillous Space - No O2 C. Spiral Artery - Low O2 D. Umbilical Artery - High O2 E. Umbilical Vein - Low O2
You isolate a pathogenic strain of E. coli from a patient and discover that this E. coli strain is resistant to an antibiotic. Common laboratory strains of E. coli are not resistant to this antibiotic,
nor are any other previously isolated pathogenic E. coli strains. However, such resistance has been observed in other bacteria in the hospital in which the patient was treated. This newly discovered antibiotic resistance in E. coli is most likely due to _______. (a) a mutation within a gene. (b) a mutation within the regulatory DNA of a gene. (c) gene duplication. (d) horizontal gene transfer.