Fire and Mello studied the effect of RNAs made from plasmids on gene expression in the nematode C. elegans. The results from the two experimental treatments and the control are shown below. What can be concluded from these results?
A. The labeled probe detects RNAs other than mex-3.
B. Double-stranded RNA degrades more mex-3 mRNA than antisense RNA.
C. The injection procedure results in degradation of all mex-3 mRNA.
D. Antisense RNA degrades more mex-3 mRNA than double-stranded RNA.
Answer: B
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Match the following items with the correct phrase.
_______1. Has caused massive fish kills along the east coast of the United States. _______2. Associated with red tides and paralytic shellfish poisoning. _______3. The source of agar. _______4. The only alga known to cause an infectious disease. _______5. Classified as an alga by some taxonomists and a protozoan by others. a. Prototheca b. Pfiesteria piscicida c. dinoflagellates d. a red marine alga e. Euglena
Carbohydrate digestion begins in the ____
a. mouth b. stomach c. small intestines d. large intestines e. liver
Anton has diabetes mellitus and has to take insulin. One day he forgot to inject himself as his doctor directed. Predict the most likely consequence according to this chapter
A) greater protein synthesis B) rise in blood glucose levels C) more fat storage D) increase in glycogen storage
At the end of DNA replication, the sister chromatids are held together by the ___________
(a) kinetochores. (b) securins. (c) cohesins. (d) histones.