Answer:
People drink water that has been contaminated by animal feces
Explanation:
Answer:
correct
Explanation:
Water carries nutrients to all cells in our body and oxygen to our brain. Water allows the body to absorb and assimilate minerals, vitamins, amino acids, glucose and other substances. Water flushes out toxins and waste.
The answer is it begins at the PYLORIC SPHINCTER and ends at
the ILEOCECAL SPHINCTER. The pyloric sphincter is a group of smooth muscle at
the joint between the pylorus of the stomach and the duodenum of the small
intestine. It plays a vital role in digestion, where it acts as a valve to
controls the flow of moderately digested food from the digestive to the small
intestine. Ileocecal is a sphincter muscle valve that split up the small
intestine and the large intestine.
Diffusion is the type of transport that oxygen and carbon dioxide use to cross the cell membrane
Answer:
a. True, b. False, c.True, d. True
Explanation:
a. Base excision repair is started by a DNA glycosylase that recognizes the changes and removes the altered base by cleavage of the glycosidic bond binding the base and the deoxyribose sugar together.
b. Nucleotide excision repair works by a cut-and patch mechanism that removes their heavy lesions, including pyrimidine dimers and nucleotides . Endonucleases are responsible for the lesion of the damaged strand.
c. Nucleotide excision repair is initiated by the proteins namely UvrA, UvrC, and UvrB in Escherichia coli.
-UvrD (helicase II) later removes the damaged strand
-DNA polymerase I (PolI) fills in the resulting gap.
d. DNA glycolases removes the damaged nitrogenous base.
-It leaves the sugar-phosphate backbone intact and thus creating an apurinic/apyrimidinic site, which is commonly referred to as an AP site.
e. Xeroderma pigmentosum complementation group A(XPA)
-This is an essential protein in the nucleotide excision repair pathway.
- It helps to make a pre-incision complex along with other proteins.
