Macrophages are unusual in their ability to ‘crawl’ to a site of infection. This
ID: 66312 • Letter: M
Question
Macrophages are unusual in their ability to ‘crawl’ to a site of infection. This crawling depends on the ability to move proteins from the back of the cell to the front using microtubules. Which of the following is NOT true of microtubules?
a. Microtubules are made from protein dimers.
b. The microtubule is larger than microfilaments and intermediate filaments.
c. The interaction of microtubule subunits is classified as quaternary structure.
d. Microtubules grow equally well at the plus and minus ends.
Explanation / Answer
d. Microtubules grow equally well at the plus and minus ends.