Answer:
a chromosome contains many genes. A gene is a segment of DNA that provides the code to construct a protein. The DNA molecule is a long, coiled double helix that resembles a spiral staircase.
Explanation:
Human cells have 23 pairs of chromosomes containing DNA. The chromosomes serve as the structure that holds the DNA. The DNA acts as a complete set of instructions that tells our bodies how to develop.
Answer:
Extension
Explanation:
Polymerase chain reaction is given by Kary Mullis and it contains three steps denaturation, annealing, and extension. In denaturation, the temperature is raised to 96° c so that the DNA can denature.
In annealing, the temperature gets reduced to 55°c so that the primer can bind to the complementary sequence. In extension, Taq polymerase is used to extend the new strand.
This enzyme is isolated from thermophilic bacteria and the temperature here is raised to 72°c so that the enzyme can extend the primer and make the complementary strand. So the right answer is extension.
Answer:
B. it gives off no radiation
Explanation:
Dark matter is so named because it neither absorbs nor emits light and therefore cannot be directly observed.
Answer:
There is sugar on the pig's surface that humans don't have.
Explanation:
"This rapid rejection occurs when human antibodies attach to sugar molecules on the surface of the transplanted pig organ's cells."