In the trp operon, where is the attenuator region located?
What will be an ideal response?
trpL
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Which of the cell adhesion molecules is critical to transducing changes in the ECM to a change in the cell?
A. connexins B. cadherins C. integrins D. fibronectins E. claudins
Which of the following statements about the placenta is false? a. The mother's body disposes of wastes for both mother and child
b. The placenta begins forming early in pregnancy. c. Maternal and fetal blood mix in the placenta. d. Embryonic blood vessels exchange substances with maternal blood.
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A) the mucus secreted by the mucous membrane physically traps microbes. B) the mucus contains a variety of antimicrobial chemicals and molecules. C) both the mucus and the outer layer of cells are shed frequently. D) the mucus is a physical trap that contains a variety of antimicrobial chemicals. E) the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.
The sigma subunit of RNA polymerase functions to
a. form RNA polymerase–DNA complexes. b. locate, recognize, and bind to promoter regions. c. terminate mRNA synthesis of genes at their stop sites. d. do both a and b.