Part b - phases of the cell cycle the cell cycle represents the coordinated sequence of events in the life of a cell from its fo
rmation to its division into two daughter cells. most of the key events of the cell cycle are restricted to a specific time within the cycle. in this exercise, you will identify when various events occur during the cell cycle. recall that interphase consists of the g1, s, and g2 subphases, and that the m phase consists of mitosis and cytokinesis. drag each label to the appropriate target. hints at this point, cell commits to go through the cycle. mitotic spindle begins to form. cell divides, forming two daughter cells. dna replicates. non-dividing cells exit cell cycle. centrosome replicates.
1 answer:
<span>I found the exercise online and this is the answer:
A. Non dividing cells exit cell cycle
B. At this point, cell commits to go through the cycle.- If the cell passed the checkpoint, it can now enter the cycle, starting on the first stage: G1
C. DNA replicates - The cell starts replicating the DNA in the S phase to then later, separate it in two cells.
D. Centrosome replicates
E. Mitotic spindle begins to form. in the M phase, after passing the G2 checkpoint
F. Cell divides, forming two daughter cells.- After passing the last checkpoint, the call can finally start mitosis process.</span>
A. Non dividing cells exit cell cycle
B. At this point, cell commits to go through the cycle.- If the cell passed the checkpoint, it can now enter the cycle, starting on the first stage: G1
C. DNA replicates - The cell starts replicating the DNA in the S phase to then later, separate it in two cells.
D. Centrosome replicates
E. Mitotic spindle begins to form. in the M phase, after passing the G2 checkpoint
F. Cell divides, forming two daughter cells.- After passing the last checkpoint, the call can finally start mitosis process.</span>
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Answer:
The nucleic acid is a macromolecule present in living systems in the form of either DNA or RNA, whose molecule consists of many nucleotides which are linked with each other to form long chains. The presence of DNA or RNA in an individual promotes continuity of life. The variability and complexity of nucleic acid are dependent on its constituent molecules as, sugar, a phosphate group, and a nitrogenous base. However, two monocyclic nitrogenous bases were classified purines (adenine:A, guanine:G) and pyrimidines (thymine:T, cytosine:C, and uracil:U).
In addition, RNA is a single-stranded structure which differs from DNA in two aspects, the sugar content of RNA is ribose, and pyrimidine base uracil replaces the thymine base of DNA. A ratio between two strands of DNA can be calculated by using Chargrff's rule which states that "DNA from any cell of all organisms possess a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases'.
The purine to pyrimidine ratio in RNA with different bases is given below in the following table:
Presence of single strand in RNA does not follow chargaff's rule and alters the purine: pyrimidine ratio. The above ratio of each base in the given information is not equal, due to which the ratio of purines to pyrimidines is different. The ratio of DNA and RNA is not equal because DNA has its complementary DNA strand. However, bases in RNA might vary due to its single-strandedness property, but its ratio is dependent on the species.
Therefore, it can be concluded that the ratio of purines to pyrimidines is dependent on the species due to its genetic makeup. Hence, option (c) is correct.
