Molecular Cell Bio Test IV: Clicker Question

Which of the situations below will enhance microtubule shrinkage?

Addison of a drug that inhibits exchange of GDP for GTP on free tubular dimers

What kind of apoptosis regulator is Bcl-2?

Antiapoptotic

A figure showing how the movement of dyne causes the flagellum to bend. IF instead of the normal situation, the polarity of the adjacent doublet of microtubules were to be reversed, what do you predict would happen?

Bending would occur, except that the right microtubule doublet would move down relative to the left one

Programmed cell death occurs ______________________.

By means of intracellular suicide program

Levels of Cdk activity change during the cell cycle because

Cyclin levels change during the cycle

Which of the statements below about intermediate filaments is false? (a) They can stay intact in cells treated with concentrated salt solutions. (b) They can be found in the cytoplasm and the nucleus. (c) They can be anchored to the plasma membrane at a cell-cell junction. (d) Each filament is about 10 μm in diameter.

D (Each in 10 nm)

How do reproductive along and therapeutic cloning differ

Embryos are placed into foster mothers during reproductive cloning but not during therapeutic cloning

(T/F) Once a cell decides to enter the cel cycle, the time from start to finish is the same in al eukaryotic cells

False

What affect would an overactive Wnt signaling pathway have on the intestine epithelium

Formation of polyps due to over proliferation of gut cells

You add a drug to mitotic cells that inhibit the activity of an enzyme that dephosphorylates nuclear laming. What do you predict will happen to these cells?

The cells should become arrested in mitosis

(T/F) Apoptosis is promoted by the release of cytochrome c into the cytosol from mitochondria

True

(T/F) Motor proteins move in a directional fashion along microtubule by using the inherent structural polarity of a protofilament

True

What would happen if the muscle cell ran out of ATP

Would not bind to actin

An adult hematopoietic stem cell found in the bone marrow _____________________.

Can undergo self-renewing divisions for the lifetime of a healthy animal

You create cells with a version of CDC 6 that cannot be phosphorylated and tis cannot be regarded. Which of the following statements describes the likely consequence of this change in CDC6

Cells will enter S phase prematurely, leading to overpoliferation according to Bayer