The bacterium shown to be associated with the majority of gastric ulcers is
A) Streptococcus lactis.
B) Staphylococcus aureus.
C) Helicobacter pylori.
D) Escherichia coli.
E) Streptococcus pyogenes.
C
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Gene methylation can be detected through the use of restriction endonucleases. Usually these are used in pairs where one enzyme will digest only unmethylated DNA in its recognition sequence while the other is insensitive to methylation
Which of the following statements is correct? A. The enzyme that is insensitive to methylation serves as a control to make sure the inability of the other enzyme to digest DNA is not due to a mutation B. These are used in pairs since experiments have to be replicated and this one way of performing a replication of the experiment C. The experimental design is flawed since there should be a third enzyme that would serve as a positive cocntrol D. This experimental design is able to detect most of the methylated C residues in a particular region of DNA.
In pedigrees, a male individual is symbolized as a ____________________. Fill in the blank(s) with the appropriate word(s)
What is the significance of the respiratory membrane to facilitate gas exchange?
A) It is covered with surfactant to accelerate gas exchange. B) Its thickness prohibits the alveoli from pulling away from the capillary. C) All three surfaces are kept moist through interstitial fluid exchange. D) The surface area is increased with this membrane. E) Epithelial and endothelial cells share a common basement membrane.
photosynthesis
What will be an ideal response?