Microtubules and microfilaments are said to be "dynamic" elements of the cytoskeleton. In this case, dynamic means that:
A. once individual microfilaments and
microtubules have formed they can change
shape and move around inside the cell.
B. they are constantly changing and are
never in the same place for very long.
C. microtubules and microfilaments are
assembled and disassembled and then
reassembled again in a regulated manner.
C
You might also like to view...
The reasoning behind the use of fecal transplants from healthy individuals is:
A. the competition from the introduction of other bacteria into the gastrointestinal tract keeps C. difficile numbers down. B. the fecal matter from healthy patients does not have C. difficile. C. C. difficile feeds on other bacteria that are introduced with the fecal transplant. D. antibiotics are administered with the fecal transplant, thus controlling populations of C. difficile.
A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere. What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?
A. The ratio of carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. B. The amount of carbon will vary unpredictably in the younger rocks, because rock weathering added carbon dioxide to the atmosphere, and volcanic activity sequestered it. C. The younger rocks will have higher levels of carbon dioxide, because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste. D. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes.
Which of the following is an organic compound?
A) adenine B) carbon dioxide C) molecular oxygen D) sodium chloride E) water
What is imprinting and what is the role of DNA methylation in it?
What will be an ideal response?