Table of Contents
Why the mitochondria have to replicate during the early stages of G1 of the cell cycle?
During the cell cycle the mitochondrial organelles including their genomes have to be replicated and segregated to ensure faithful propagation to the daughter cell. Furthermore, correct import of the nuclear encoded proteins into the different sub-compartments of the organelle is essential.
Which phase do synthesis of mitochondria and chloroplast occur?
The mitochondrial DNA (mt-DNA) and the chloroplast DNA (cp-DNA) are synthesized during stage I, while the cell-nuclear DNA (cn-DNA) is duplicated in stage II. The mitochondria- and chloroplast-nuclear divisions are completed in stage IV.
Do organelles replicate in G1 or G2?
Explanation: The S phase (or synthesis phase) is a period of the cell cycle during which DNA is replicated (or synthesized). G1 and G2 are both growth phases, during which cellular organelles are replicated and the cell grows in size.
What is the difference between a cell in the G1 phase and a cell in the G2 phase?
During the G1 phase, the cell shows first growth by copying organelles and making the molecular building blocks which are necessary for later steps. During the G2 phase, the cell shows the second growth by making proteins and organelles and beginning to reorganize its contents in preparation for mitosis.
What happens during metaphase?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. These chromosomes then become visible. During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell.
Why is the G1 phase important?
The G1 phase is often referred to as the growth phase, because this is the time in which a cell grows. During this phase, the cell synthesizes various enzymes and nutrients that are needed later on for DNA replication and cell division. The G1 phase is also when cells produce the most proteins.
Which is synthesized in G1 phase?
During G1 phase, the cell grows in size and synthesizes mRNA and protein that are required for DNA synthesis. Once the required proteins and growth are complete, the cell enters the next phase of the cell cycle, S phase.
What is a difference between a cell in the G1 phase and a cell in the G2 phase quizlet?
What is the difference between a cell in the G1 phase and a cell in the G2 phase of the cell cycle. A cell in the G2 phase would have more DNA than a cell in G1. During which phase of the cell cycle do chromosomes duplicate? How do prokaryotic cells divide?
What happens in metaphase?
What is the difference between G1 and G2 phase?
G1 phase is the first phase of the interphase of the cell cycle in which cell shows a growth by synthesizing proteins and other molecules. G2 phase is the third phase of interphase of the cell cycle in which cell prepares for nuclear division by making necessary proteins and other components.