TA Section 7 (4/4)

Which is made up of 13 proto-filaments arranged in a cylinder?

• Microtubules

• Intermediate Filaments

• Actin Filaments

Tubulin-GDP/Actin-ADP have ___ affinity for growing microtubules/filaments than the ATP-bound form.

• higher

• lower

• the same

___ are used to explore the environment, while ___ are used to conduct movement along a substrate.

• Actin filaments, integrins

• Integrins, actin filaments

• Lamellipodia, filipodia

• Filipodia, lamellipodia

Kinesin and dynein are molecular motors that "walk" along which of the following?

• Microtubules

• Intermediate filaments

• Actin filaments

• Nuclear lamina

M-CdK is inhibited by ____ and activated by ____.

• phosphorylation (Wee1), dephosphorylation (Cdc25)

• Dephosphorylation (Wee1), phosphorylation (Cdc25)

• phosphorylation (Cdc25), dephosphorylation (Wee1)

p53 is a ___ that is active when DNA damage is detected.

• kinase

• transcription factor

• CdK inhibitor

• transcription factor inhibitor

Cohesin and condensin both form rings and bind to chromatids during mitosis. Which is involved in the packing of nucleosomes into a tighter chromosome structure?

• Cohesin

• Condensin

Which of the following are involved in pushing apart the centrosomes and creating the mitotic spindle during prophase?

• Dynein

• Kinesin

• Centrioles

• Microtubules

True or False: During metaphase, microtubules are attached directly to chromatids.

• True

• False

When are chromosomes the MOST condensed?

• S phase

• G1 phase

• Metaphase of Mitosis

• Telophase of Mitosis