What is the metaphase scaffold of eukaryotic chromosomes and what is its role?
What will be an ideal response?
Ans: The metaphase scaffold is a protein core to which loops of supercoiled DNA averaging about 60 kb in length are attached. In addition to organizing these DNA loops, the metaphase scaffold may be responsible for the shape of mitotic pair of sister chromatids.
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In eukaryotes, pyruvate is converted to acetyl CoA
A) in the cellular cytosol. B) when passing through the mitochondrial outer membrane. C) in the intermembrane space. D) when passing the mitochondrial cristae. E) in the mitochondrial matrix.
Which function below is not performed by the gills of bony fishes?
a. extract nutrients from the water b. extract oxygen form the water c. eliminate carbon dioxide from their body d. aid in osmoregulation
Four of the five answers are traits that influence the life history pattern of a living organism. Select the exception
a. The age at which the organism begins to reproduce b. How often the organism reproduces. c. The number of offspring produced per reproductive event d. The length of the reproductive stage e. Natural disasters that influence survivorship
Which of the following may occur in meiosis but not in mitosis?
A. DNA replication B. chromosome condensation C. metaphase D. cytokinesis E. crossing-over