Answer:
All the organisms has developed some methods to respond towards the changing environment. Bacteria also develops some mechanism by which they are able to tolerate the external environment.
Some bacteria respond towards environment by increasing the rate of mutation. This mutation can be accomplished as it creates the formation of oncogenes in the bacteria. The cyclins and kinases of cell cycle gets mutated that leads to the uncontrolled growth of cell bacteria. This produces an evolutionary advantage to bacteria as it allows the bacteria to grow in the hostile environment. For example: the development of resistant strain of bacteria towards a specific drug.
Answer:
- strand RNA rhabdoviruses.
Explanation:
Rhabdovirus is the large family of the single stranded negative sense of the RNA virus that has the capability to utilize the ecological niche. These viruses can affect the animals.
The RNA that are present in the negative-sense virus cannot be infectious as this virus must be transcribe into the positive sense RNA. The positive sense strand of this virus has the ability to be translated in the viral genome. The RNA dependent RNA polymerase.
Thus, the correct answer is option (3).
Answer:
A diploid cell is a cell that contains two complete sets of chromosomes. This is double the haploid chromosome number. Each pair of chromosomes in a diploid cell is considered to be a homologous chromosome set. A homologous chromosome pair consists of one chromosome donated from the mother and one from the father.
Explanation:
Answer:
A food chain showing how each living things which are present on the planet getting food. Plants are known as producer because they have ability to use a light energy comes from sun to produce, food. Animals are not able to make their food so, they are eating other animals, and plants. They are known as consumers.
In a food chain, energy is converted from one link to another link. In a food chain when a herbivore eats food it gets a fraction of energy from plant becomes new body mass. The left energy used by the herbivores for life processes such as reproduction, digestion, and movement or lost as a waste. When the carnivore eats herbivores it passes a small amount of energy to the carnivores, and same as herbivores some energy is used for life processes or some energy is wasted.
Because of the lots of energy is wasting at each link the actual amount of energy which is transferred decreases every time.
Answer:
The risk of disease transmission is drastically low with his method, compare to the previous method with great tendency of transmitting diseases,which were lethal to the recipient.
Explanation:
He had noticed that milkmaids were only affected with cowpox,but are not affected with small pox.Thus he reasoned that they must have immunity against small pox.
Through his crude methods he extracted pus from a milkmaid who carried the virus for cowpox,and inserted this into the arm of a young through the opening created. After latent period of days he exposed the boy to the smallpox,and surprisingly he was not infected,thus the boy developed immunity to this virus which was related to the virus injected.
Thus he was able to develop immunity against the related diseases.
Besides he observed that this boy did not show symptoms of any other diseases or infection.