20. Read the following and answer any four questions:
In the electrolytic refining of copper. The electrolyte is a solution of acidified copper sulphate. There are an anode and cathode. Refining is carried out by passing an electric
current.
Cathode
Anode
wcu
Cul
Arlind copper sulphate solution
Tunk
Impurities Lat we do
L The anode is
a. pure strips
b. Impure copper
c. refined copper
d. none of these
il. Anode mud consists of:
a. insoluble impurities
b. soluble impurities
C. pure metal
d. impure metal
ill. Which of the following are refined electrolytically: (A) Au, (B) Cu, (C) Zn, (D) K
a. A and B
b. B and C
C. A, B and C
d. B, C and D
iv. On passing, electric current Cu is deposited on:
a. cathode
b. anode
c. bottom of cathode
d. bottom of anode
v. Which one of the following four metal would be displaced from the solution of its sa
by the other three metal?
Answers
The cytoskeleton is a network of microfilaments, intermediate filaments, and microtubules. The cytoskeleton functions to:
1) give shape to cells lacking a cell wall;
2) allow for cell movement,e.g. , the crawling movement of white blood cells and amoebas or the contraction of muscle cells;
3) movement of organelles within the cell and endocytosis;
4) cell division, i.e., the movement of chromosomes during mitosis and meiosis and the constriction of animal cells during cytokinesis.
We will now take a closer look at microtubules, microfilaments, intermediate filaments, centrioles, flagella, and cilia.
a. Microtubules
Microtubules are hollow tubes made of subunits of the protein tubulin. They provide structural support for the cell and play a role in cell division, cell movement, and movement of organelles within the cell. Microtubules are components of centrioles, cilia, and flagella (see below).
b. Microfilaments
Microfilaments are solid, rodlike structures composed of actin. They provide structural support, and play a roll in phagocytosis, cell and organelle movement, and cell division.
c. Intermediate filaments
Intermediate filaments are tough fibers made of polypeptides. They help to strengthen the cytoskeleton and stabilize cell shape.
d. Centrioles
Centrioles are located near the nucleus and appear as cylindrical structures consisting of a ring of nine evenly spaced bundles of three microtubules. Centrioles play a role in the formation of cilia and flagella. During animal cell division, the mitotic spindle forms between centrioles.
Answer:
the anode mud consist of
1