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Microfilaments contain actin filaments. They are the thinnest filaments of the cytoskeleton, which is a structure found in the cytoplasm of eukaryotic cells.

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Q: What contains actin filaments?
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Where are actin filaments only located?

in the A band


What are two myofilaments that slide past one another to allow muscle cells to contract?

Actin and Myosin


What part of the cytoskeleton is made of actin subunits?

Micro filaments


If a researcher was interested in slowing down the movement of amoebas by disrupting their cell membranes which protein filaments should she be studying?

Considering that Amoeba sp., among other animal cells, possesses the capacity of dynamic surface extensions containing actin filaments. These filaments produce pseudopodia-stubby distensions of the actin cortex-with which they walked over surfaces. Therefore if there is an interest in slowing down the movement we would have to be interested in fibroblast cells that regularly extend a thin, sheetlike process known as lamellipodium, which contains a dense meshwork of actin filaments. Moreover, actin filaments can form the so-called microspikes, which are about 0.1 um wide and 5 to 10 um long and contain a loose bundle of about 20 actin filaments oriented with their plus ends pointing outward. In conclusion, it will be a good idea to look at the actin protein in order to make a research in amoeba's locomotion processes.


Which of the following become connected by myosin cross-bridges during muscle contraction A) thin filaments and thick filaments B) thin filaments and t-tubules C) thick filaments and titin filame?

Interactions between actin and myosin filaments of the sarcomere are responsible for muscle contractions. The I bands contain only thin (actin) filaments, whereas the A bands contain thick (myosin) filaments.