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:
Growth hormone.
Explanation:
Human growth hormone is a polypeptide hormone that regulates the growth, cell metabolism and cellular differentiation. The hypo or hyper secretion of this hormone can cause a particular disease in the individual.
The long-term hyposecretion of the growth hormone during childhood and adolescence can lead to the dwarfism. The individual has shorter height than the normal individual in dwarfism.
Thus, the correct answer is option (c).
Answer:
Piaget's theory of cognitive development is a comprehensive theory about the nature and development of human intelligence. It was originated by the Swiss developmental psychologist Jean Piaget (1896–1980). ... Piaget's theory is mainly known as a developmental stage theory.
Explanation:
Answer:
A lone rescuer uses a compression-to-ventilation ratio of 30:2.
Explanation:
