b. How many picograms of DNA are there at the start of prophase? c. How many chr
ID: 213531 • Letter: B
Question
b. How many picograms of DNA are there at the start of prophase? c. How many chromosomes are there at metaphase? 1-1 hro inos,en d. How many chromatids are there at prophase?chrometids e. How many chromosomes are there at the conclusion of anaphase?chinore A human adult neuron within the central nervous system will not divide. Would a cell of 2. this type ever be found in S phase? Explain your answer It is common to study mitosis using fish embryos. Why would you want to use an embryo to study mitosis? 3. 4. Why would it not make sense to study a human adipocyte when studying meiosis?Explanation / Answer
a) the amount of DNA in prophase depends on the amount of dna in the G1 phase . for example is 8 picograms of dna is present in G1phase will give 16picograms of dna in prophase that is double of it in the G1 phase
b)there are 8 chromosomes present, but 16 chromatids. Similarly, in humans (2n=46), there are 46 chromosomes present during metaphase, but 92 chromatids.
c) embryo cells are good for studying mitosis because these cells are
always growing and going through mitosis
. They show all the stages very clearly.
d) Adipocyte hyperplasia is associated with obesity and arises due to adipogenic differentiation of resident multipotent stem cells in the vascular stroma of adipose tissue and remote stem cells of other organs. The mechanistic characterization of adipocyte differentiation has been researched in murine pre-adipocyte models (i.e. 3T3-L1 and 3T3-F442A), revealing that growth-arrest pre-adipocytes undergo mitotic clonal expansion and that regulation of the differentiation process relies on the sequential expression of three key transcription factors (C/EBP, C/EBP and PPAR). However, the mechanisms underlying adipocyte differentiation from multipotent stem cells, particularly human mesenchymal stem cells (hBMSCs), remain poorly understood. This study investigated cell cycle regulation and the roles of C/EBP, C/EBP and PPAR during adipocyte differentiation from hBMSCs.
hence it is considered only in mitosis not mieosis
e)
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