Answer:
Only the extracts from heat-killed cells treated with RNase are unable to transform nonvirulent bacteria into virulent bacteria.
Explanation:
The experiment by Avery, McCarty and MacLeod aimed to identify Griffith's "transforming principle," which is a principle that explains how transformation is a way of recombining, exchanging, or transferring genetic information between organisms or from one organism to another. For this, they used cell that were heat inactivated and purified the transforming principle of these cells.
The purified cells did not give positive results in the tests done by the scientists, but they presented transformants very similar to the DNA. However, Avery suspected that the result should be reinterpreted and that the molecule was not a DNA. This is because RNA degrading enzymes had no effect on the transforming principle and only RNase-treated heat-killed cell extracts are unable to transform non-virulent bacteria into virulent bacteria.
Answer: A and D
Explanation: In old age, dehydration and compression of the disc between the vertebrae in the spine causes reduction in height. The loss of bone density (osteoporosis) can also make the spine to become more curved, and make the vertebrae to collapse due to thinning that is caused by overall decrease in body water. This can be the reason for the reduction in height of the patient.
Answer:
Among the different disaccharides, lactose (milk sugar) is the only carbohydrate of animal origin.
Mathieu Orfila was the founder of toxicology
Answer:
They make the protein fibers in CT
Explanation:
Fibroblast is a proteinous compound which aids the synthesis and maintenance of extra cellular matrix.
They also help in the wound healing processes of the body and as a major component of the connective tissues in the body also.
The analysis above then validates the fibroblast as making the protein fibers in the connective tissue.
