Question

1.

You're shown a picture of a single cell with several mitotic spindles in anaphase. This image was probably obtained by interfering with the function of:
	A)	microtubules.
	B)	intermediate filaments.
	C)	dynein.
	D)	myosin.
	E)	keratin.

2.

During contraction of skeletal muscle:
	A)	actin filaments are shortened.
	B)	myosin filaments are lengthened.
	C)	the sarcomere is pull apart.
	D)	actin hydrolizes ATP.
	E)	myosin and actin filaments interact.

3.

"G proteins" are:
	A)	proteins which contain a lot of the amino acid glycine.
	B)	proteins involved in signal transduction.
	C)	receptors for hormones.
	D)	enzymes that synthesize GTP.
	E)	proteins found in the golgi complex.

Answer 1

1. anaphase= centromere of each chromosome divides into two so that each chromatid comes to have its own centromere. the two chromatids now start repelling each other and separate completely to become daughter chromosome. the daughter or new chromosome move towards the poles of spindle due to contraction of spindle fibre. spindle fibre is made up of microtubule

ans. A microtubule

2. during muscle contraction actin and myosin filament interacts with each other and form a cross bridge. atp is hydrolysed by the myosin head no actin filament. sarcomere is shortened and the z line is pulled in the midline towards the m line

3. G proteins are proteins involved in signal transduction.

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