Nuclear DN A exists as a complex of proteins called which condense (s) in ______

Question

Nuclear DN A exists as a complex of proteins called which condense (s) in ______ during cellular division. A) chromosomes;chromatin B) chromatids;chromosomes C) chromophores;chromatin D) chromatin;chromosomes E) None of the above Which of the following statements about microfilaments and microtubules is A) Doth are made up of the same Protein monomers. B) Both are involved in movement of cells. C) Both have a plus end and a minus end. D) Both are components of the cytoskeleton. E) Both help maintain and support cellular structures. The rough ER is the portion of the ER that A) lacks ribosomes. B) is the oldest and was once the smooth ER. C) has ribosomes attached to it. D) is connected to the Golgi apparatus. E) is the site of steroid synthesis. If the organelles of an animal cell were separated by centrifugation, which would require the least amount of centrifugal force to sediment at the centrifuge tube? A) Mitochondria B) Nuclei C) Golgi apparatus D) Lysosome E) Chloroplasts The surface area - to - volume ratio of a cell A) increases with increasing volume of the cell. B) decreases with decreasing surface area of the cell. C) accounts for the size limit of cells. D) is of little significance in maintained cell homeostasis. E) affects how molecules are distributed across the cell.

Explanation / Answer

67)d Chromatin, Chromosomes.DNA exists in Chromatin form in the nucleus. The chromatin condenses to form Chromosomesduring cell division

68)a both are made of the same protein monomers.

Microtubles have tubulin monomer while microfilaments have actin monomer

b) both are involved in movement of cells. Microfilaments are responsible formovemnet, microtubules are not.

69)c has ribosomes attached to it

d) is connected to the golgi apparatus

70) b Nucleus. It is the heaviest and hence requires least force

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