Answer:
DNA is made up of a sugar phosphate backbone .
it has4 bases namely adenine ,thymine ,guanine and cytosine shortened to A T G C
adenine and thymine are connected by 2 hydrogen bonds and guanine and cytosine are connected by 3 hydrogen bonds
the two strands are anti parallel in nature ie, if one strand is from 3 to 5 the strand is from 5 to 3.. there are three types of DNA depending on the environment... they are adna bdna and zdna
Explanation:
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Answer:
Killer T cells release enzymes that help destroy invading foreign matter (antigens), Helper T cells, on the other hand, stimulate another type of lymphocyte known as B cells. B cells produce antibody, which is a protein made in response to a specific antigen.
Answer:
Answer: The correct answer is- Theory.
Hypothesis can be described as an assumption or proposition, which is made on the basis of certain evidences without knowing the real truth about it. It is tested further for investigation about the proposed explanation with the help of repeated experiments (using certain protocols).
When it becomes supported by repeated experimentation, it is converted into theory.
Thus, theory is the right answer.
Answer:
Every recognized species on earth (at least in theory) is given a two-part scientific name. This system is called "binomial nomenclature." These names are important because they allow people throughout the world to communicate unambiguously about animal species.
Answer:
RNA contains an additional oxygen atom on the ribose sugar. (Ans. C)
Explanation:
RNA contains a sugar which is known as ribose, and which contains an extra group of hydroxyl (OH-) while DNA contains deoxyribose sugar.
RNA contains four nitrogenous bases cytosine, adenine, guanine, and uracil, while DNA contains cytosine, adenine, guanine, and thymine.
Double helix means two stranded structure like DNA, while RNA is single stranded.
DNA molecule is much longer polymer than RNA molecule.
