Question

question 25
1 pts
which of the following does not describe a structure or function of the proteasome?
breaking down abnormal and misfolded proteins released from the er
looks like a hollow cylindrical drum made of protein subunits
requires the small protein called ubiquitin to pull proteins in
all of the above are structures or functions of proteasomes.

question 26
1 pts
granules or threads within the nucleus are called:
microfilaments.
chromatin.
nucleotides.
microtubules.

question 27
1 pts
the cell extension that contains microfilaments is called:
microvilli.
flagella.
cilia.
all cell extensions contain microfilaments.

Explanation:

• Question 25: Proteasomes break down abnormal and mis - folded proteins from the ER, have a hollow cylindrical drum - like structure made of protein subunits, and require ubiquitin to pull proteins in. So all the given options describe proteasome structures or functions.
• Question 26: Chromatin consists of granules or threads within the nucleus. Microfilaments are part of the cytoskeleton outside the nucleus, nucleotides are the building blocks of nucleic acids, and microtubules are also cytoskeleton components.
• Question 27: Microvilli are cell extensions that contain microfilaments. Flagella and cilia are made of microtubules. Not all cell extensions contain microfilaments.

Answer:

Question 25: D. All of the above are structures or functions of proteasomes.
Question 26: B. chromatin.
Question 27: A. microvilli.