Answer:
The correct answer is option E. "direct repair using photolyase has removed many of the pyrimidine dimers from the DNA in an error-free manner, so there are fewer lesions for SOS repair to process".
Explanation:
Photolyase is a type of enzyme that catalyses DNA repair from damage caused by exposure to ultraviolet light. Photolyase requires activation by exposure visible light, particularly from the violet end of the visible spectrum. If the Petri plates of the bacteria exposed to UV are located in an incubator that is closely at a large sunny windows, it is very likely that the bacteria is performing direct DNA repair using its photolyase enzymes.
<h3><u>Answer</u>;</h3>
A. Pressure causes water and dissolved substances to filter through capillary walls of the glomerulus.
<h3><u>Explanation;</u></h3>
- <em><u>During filtration the flow of blood in the glomerulus creates hydrostatic pressure in the glomerulus which forces molecules through the glomerular filtration membrane. </u></em>
- Normal filtrate contains of water, glucose, amino acids, urea, creatinine, and solutes such as sodium chloride, calcium, potassium and bicarbonate ions.
Answer:
A lot of factors cause genetic variation in a population. The root of all genetic variation is mutations, which occur randomly.
A lot of genetic variation in fact results during meiosis, the process by which gametes (sex/reproductive cells) are formed. The 3 main ways are crossing over, independent assortment of chromosomes, and random fertilization. Crossing over occurs during Prophase I of meiosis, in which genetic material is exchanged between nonsister chromatids of homologous chromosomes. Independent assortment refers to the following: When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. Random fertilization is where any sperm can fertilize any egg cell. The many combinations of eggs and sperms mean variation.
Another source of genetic variation include gene flow. Gene flow is where populations have their members enter other populations (migration), influencing the gene pool of populations. This source is more controversial, however.
Random mating can also increase genetic variation.
Answer:
uracil, adenine, cytosine
Explanation:
The anticodon of tRNA binds to the triplet codon of mRNA. Adenine of tRNA would pair with uracil of mRNA codon. Uracil of the tRNA anticodon would pair with adenine of the mRNA codon. Similarly, the guanine of the tRNA anticodon binds to the cytosine of the mRNA codon. The codons of mRNA are read from 5' to the 3' direction. And the polarity of the anticodon of tRNA is opposite to that of the mRNA codons. Therefore, if a tRNA anticodon has a sequence of "Adenine, Uracil, Guanine", it would pair with the mRNA codon with a sequence "uracil, adenine, cytosine".
