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:
Most hair masks should stay on for 15-30 minutes
Explanation:
Conditioning hair masks like olive oil are meant to restore sebum in the follicle and it if it is left on too long the hair may become oily as there is too much sebum in the follicle. But I wouldn't use olive oil on your face because that is how acne breakouts starts as there is added sebum to your pores.
Answer:
Healthcare providers will put on gloves and wear a gown over their clothing while taking care of patients with MRSA. Visitors might also be asked to wear a gown and gloves.
Answer:
B
Explanation:
The umbilical vein carries oxygenated, nutrient-rich blood from the placenta to the fetus, and the umbilical arteries carry deoxygenated, nutrient-depleted blood from the fetus to the placenta
