Ans.
DNA acts as genetic material in all living organisms that store and transmit genetic information from one to next generation. DNA sequence carries instructions for the expression of genes to make proteins, responsible for different phenotypic characters of individuals.
The DNA, first synthesizes mRNA molecule that carry information for the protein synthesis, in the form of codons and code for a specific polypeptide chain or protein.
The sequence present in DNA determines the amino acid sequence in protein encoded by the DNA. Change in DNA sequence affects gene expression as it leads to change in mRNA sequence, and thus, change in sequence of amino acid of the resulting protein.
Answer:
B. Surgery
Explanation:
I am not entirely sure but based on the definition of selection pressure (which talks about how external agents affect the survival of an organism) surgery is does not meet the definition.
A tiger hunting a prey affects the survival of prey. Beginning of ice age is an environmental agent that can affect survival of organism that cant tolerate cold. Antibiotics are drugs that can kill bacteria thus lower their survival. Surgery can actually increase survival if some form of disease is being treated.
Answer:
The genes that are newly expressed after the stem cell has received the Self Renewal signal are: ID genes, DET genes and DIV genes.
Explanation:
Stem cells have the capacity of turning into different types of cells according to the needs of the tissue they're in. When these genes are expressed, the stem cell loses this potential.
Answer:
The correct answer is B
Explanation:
Although the dental formula gives hints to the diet of a species, all mammals do not have the same dental formula. For instance, a rabbit has upper jaw:2incisors, 3premolars and 3 molars and no canines. While a dog has 3incisors, 1 canine, 4 premolars and 2molars in its upper jaw. Yet, they are both mammals.
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Scientific names follow a specific set of rules. Scientists use a two-name system called a Binomial Naming System. Scientists name animals and plants using the system that describes the genus and species of the organism. The first word is the genus and the second is the species.
