I think it is Air Polution
Answer:
This is a vertical line. The x value does not change
m = (y2-y1)/(x2-x2)
the denominator is 0
which gives us undefined
Choice A
Answer:
a) true
Explanation:
It is absolutely right that in mammals dosage compensation occurs due to X-inactivation in females. It happens because in mammals like humans, females have XX and males have XY as allosomes. Because of the presence of two X chromosomes, each gene is present in 2 copies in females but in males only 1 copy is present as they have only one X chromosome. So in order to compensate for this kind of difference, one of the female X chromosomes undergoes inactivation and this phenomenon is known as dosage compensation.
The X chromosome undergoes inactivation because of its DNA modification and acts very different from other X chromosomes. Several methyl groups are added to the DNA of such X chromosome so as to inactivate it. In general such inactivated X chromosome is known as bar body which appears like a darkly stained structure.
Note: In other lower organisms like drosophila and C. elegans other mechanisms of dosage compensation exist.
In drosophila rather than inactivation of one chromosome in female, the transcription rate of one X chromosome of male is doubled so that it could produce as much transcripts as two X chromosomes of female are producing.
In C. elegans, both the X chromosomes are active but partially. The transcripts produced by two X chromosomes of female equalize the transcripts produced by one X chromosome of hermaphrodite counter part.
Genetic Drift Defined. Populations of organisms are constantly changing and adapting to their environment. Drastic changes in environmental conditions can sometimes cause drastic changes to the gene pool of the population. Genetic drift is when chance events cause changes in frequencies of alleles in a population.
Answer;
-Enzymes
Enzymes are class of proteins, they make metabolic reactions proceed much faster than they would have on their own.
Explanation;
-Proteins are biological macromolecules that are diverse in shape size and function. Enzymes are biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life. They are biological catalysts.
All enzymes are proteins by definition. But not all biomolecular catalysts are proteins. Most enzymes are proteins, although a few are catalytic RNA molecules.