Answer:
The correct option is <em>C. A gene is a specific segment of DNA on a chromosome</em>
Explanation:
Option A is false because a gene is a segment on a chromosome.
Option B is false because a chromosome carries many genes.
Option D is false because a gene carries a segment of DNA, not all of the DNA.
Option C is correct because there are many genes present on a single chromosome. Each gene carries a segment of DNA. The position of a gene on the chromosome is known as its loci.
Differentiated cells have a particular role undifferentiated do not have a certain role.
Scientists combine several well-testedtechniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rock to be calculated.
Your answer is going to be A pairs with T via 3 hydrogen bonds and C pairs with G via 2 hydrogen bonds.
An easy way to remember this is that the curvy letters (C and G) bond with each other and the straight letters (A and T) bond with each other. That never changes.
I hope I was able to help. Best of luck!