Answer:
B. Cells in Alex’s body underwent mitosis to create new tissue
Explanation:
Mitosis is the cell division that forms two genetically identical daughter cells from one parent cell. It occurs in somatic cells and is responsible for the growth and development of individuals.
Alex gained the height as the cells in tissues of his body underwent the mitosis and produced new daughter cells. Repeated cycles of mitosis added a large number of new cells to his body to form new tissues in his body parts and caused an increase in his height.
<h2>Correct answer is option "a"</h2>
Explanation:
- Succession is a directional non-regular total change in the sorts of plant species that involve a given region through time. It includes the procedures of colonization, foundation, and annihilation which follow up on the taking an interest plant species.
- Most successions contains various stages that can be perceived by the assortment of species that overwhelm by then in the succession start when a zone is made in part or totally without vegetation due to an unsettling influence.
- Some basic instruments of unsettling influence are fires, wind storms, volcanic emissions, logging, environmental change, extreme flooding, sickness, and irritation. Succession stops when species organization changes never again happen with time, and this community is said to be a peak network.
- So, the correct answer is option a "primary succession"
Answer:
c. If the double helix were unwound, each nucleotide along the two parent strands would form a hydrogen bond with its complementary nucleotide.
Explanation:
According to the Watson-Crick model, two DNA strands are held together by complementary base pairing wherein each nucleotide of one DNA strand forms hydrogen bonds with its complementary nucleotide present in the other strand. During DNA replication, two DNA strands are separated by the action of helicases enzymes.
The separated DNA strands serve as a template for DNA replication. Here, each nucleotide of the template DNA strand binds to its complementary nucleotide by hydrogen bonds. For example, adenine of the template strand forms two hydrogen bonds with thymine while guanine forms three hydrogen bonds with cytosine.
