The nuclear envelope is perforated with openings called nuclear ________ that regulate the movement of molecules through the envelope.
Fill in the blank(s) with the appropriate word(s).
pores
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Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the only place in the cell where the cyclins and Cdks are located. B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase. C. This is the location where the chromosomes can become attached to the spindle microtubules. D. This allows asters to form. E. This allows sister chromatids to form.
Of which materiais is cartilage composed?
A. glycoproteins and calcium phosphate B. glycoproteins and collagen fibers C. collagen fibers and osteocytes D. osteocytes and glycoproteins E. osteocytes and calcium phosphate
What is the most likely way a mutation in one gene can convert one body part to another?
A) The mutated gene encodes a protein that affects the expression of many other genes. B) The mutated gene encodes a protein that determines cell shape. C) The mutation is in a structural gene and results in production of more protein than usual. D) A mutation in only one gene cannot convert one body part to another.
Which biochemical unit encodes a single protein?