Cells grow during both Gap 1 and 2, but since we've to choose a proper answer, I'd go for A, the G1 checkpoint, the first one.
Answer:
Proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU.
Explanation:
Mutation may be defined as the sudden or heritable change in the genetic sequence of the organisms. The mutation can change the phenotype and genotype of the organisms.
The AAA codes for the lysine. The mutation attaches the anticodon AAA instead of normal phenylalanine. The aminonacids AAA will code for the lysine and no phenylalanine is observed in the cell as phenylalanine is coded by UUU and not by AAA.
Thus, the correct answer is option (b).
Answer:
During DNA replication, the leading strand is synthesized in the 5' to 3' direction. The strand that runs away from the replication fork is synthesized in Fragments because DNA polymerase cannot synthesize in the 3’ to 5’ direction.
Explanation:
- A replication fork has one strand called the leading strand, it is synthesized continuously from a single primer on the leading strand template and grows in 5'-3' direction.
- The leading strand grows in the same direction in which the replication fork grows.
- The other strand is the lagging strand that is unveiled by the growing replication fork. It proceeds in the direction opposite to the movement of growing replication fork.
- The lagging strand is synthesized discontinuously because the DNA polymerase can add nucleotides only to the 3' end of a primer.
- These short pieces of synthesized DNA are okazaki fragments.Okazaki fragments are joined later by ligase.
Answer: Plant cells have a cell wall, and chloroplasts. Animal cells don't.
Explanation:
The answer should be A. A controlled nuclear chain reaction produces heat, driving steam turbines to produce energy.
