Which of the following affects the size of the clear zone in a disk diffusion test of antimicrobial susceptibility?
A. The solubility of the drug
B. The diffusion rate of the drug
C. The initial concentration of the drug
D. All of the choices are correct.
Answer: D
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The peptides bound by a single MHC protein share a common
A) C domain. B) peptide motif. C) V domain. D) nucleotide sequence.
How is a fetus able to extract O2 from its mother's blood?
A. Fetal hemoglobin has a higher affinity for O2 than maternal hemoglobin. B. Fetal hemoglobin has a lower affinity for O2 than maternal hemoglobin. C. The pO2 of fetal blood is higher than the pO2 of maternal blood. D. Fetal blood has a higher concentration of hemoglobin than maternal blood. E. The maternal blood mixes with the fetal blood in the placenta to provide O2.
Answer the following statements true (T) or false (F)
1. Cellulose in the cell wall is a primary energy store for plants. 2. If a drug blocked the activity of an integrin, that cell would not be able to respond to changes in the ECM. 3. Unlike animals, plants lack a cell junction where small molecules can move from one cell to another cell. 4. The heart, skeletal muscles, and blood vessels all contain muscle tissue.
Which group of fungi has hyphae that are multinucleate and not divided by septa?
a. monokaryotic b. unicellular c. ascomycete d. coenocytic e. sporophyllous