A researcher performs RNAi against a gene that is required for viability in C. elegans embryos and 70% of the embryos die during development. Some of the embryos may have survived because
A) RNAi did not eliminate the mRNA (and protein) of the gene completely.
B) the dsRNA was used to translate additional proteins to compensate for the mRNA that was degraded.
C) RNAi eliminated the protein product of the gene.
D) of issues related to fertilization.
A) RNAi did not eliminate the mRNA (and protein) of the gene completely.
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Answer the following statements true (T) or false (F)
1. Studies by Avery, MacLeod, and McCarty with different strains of bacteria and those by Hershey and Chase with T2 bacteriophage determined that proteins are highly complex molecules that form the genetic material for bacteria and viruses. 2. A strand of DNA is composed of nucleotide bases, sulfate groups, and sugars. 3. When considering the complexity of genetic material, multiple genes are found within a chromosome. 4. If there is 28% adenine, then there must be 28% cytosine for the DNA composition of a particular organism. 5. DNA is a double helix structure whose strands are held together by hydrogen bonds with A to T and C to G base pairing.
During which stage of syphilis is the patient non-infectious?
A. first B. second C. third D. fifth
Restriction enzymes are useful in creating recombinant DNA molecules because they
A) generate "sticky ends" by cutting at the same sequence in any DNA source. B) are found only in human cells, where they naturally mend broken DNA strands. C) are used to encapsulate and transport foreign DNA into cells of the target organism. D) stimulate DNA amplification so that the desired cells or their products can be scaled up.
____ is not a component of a cellular membrane.
A. Cholesterol B. Nucleic acid C. Phospholipid D. Protein