When a blood vessel is cut, why does vasoconstriction take place?
a. To expose collagen fibers to which platelets can adhere
b. To trigger the release of platelets from the surrounding tissues
c. To initiate the activation of thrombin
d. To entrap white blood cells
e. To reduce the flow of blood
e
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In an in vitro translation assay radioactive amino acids can be incorporated into proteins and the proteins separated from the unincorporated amino acids
Given the following data what are the conclusions that you would come to? RNA added to reaction Amount of radioactivity in protein in counts per minute Insulin mRNA alone 10,000 Insulin mRNA with antisense insulin mRNA 3,000 Insulin mRNA with antisense fibronectin RNA 11,000 No mRNA 150 Insulin mRNA with double stranded insulin RNA 500 A. Double stranded RNA is more efficient at inhibiting translation than antisense RNA B. Antisense RNA is more efficient at inhibiting translation than double stranded RNA C. No conclusion about the efficiency of translation inhibiton can be made as the positive and negative controls did not perform appropriately D. The experiment did not work since the antisense fibronectin did not have an effect on amino acid incorporation. Blooms Level:
A portion of a microarray is shown above in which expression of genes on human chromosome 21
was examined in either brain cells from a normal individual (cDNAs labeled with a white fluor) or brain cells from someone with a disorder (cDNAs labeled with a black fluor). Which genes are over-expressed in the abnormal cells compared to the normal cells?
a. A2, B1, B3, and C4 b. B2 and C1 c. A1, A3, A4, B4, C2, and C3 d. A1, A2, B2, and C1 e. A2, C2, and C4
Features that contributed to success on land include a __________ that protects spores. Fill in the blank(s) with the appropriate word(s)
Sensory receptors in muscles and joints that detect ________ never adapt
Fill in the blank(s) with correct word