4/9/24, 5:32 PM Quiz: Basic Cell Biology and Cell Membrane Structure: MSCI660: Principles of Cellular Biology (D03)
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Quiz: Basic Cell Biology and Cell Membrane
Structure
Due Mar 31 at 11:59pm
Points 125
Questions 50
Time Limit 75 Minutes
Instructions
The quiz:
Covers the Learn material from Module 1: Week 1 – Module 2: Week
2. Contains 50 multiple-choice questions.
Is limited to 75 minutes.
Allows 1 attempt.
Is worth 125 points.
Submit this assignment by 11:59 p.m. (ET) on Sunday of Module 2: Week 2.
Attempt History
Attempt Time Score
LATEST Attempt 1 56 minutes 122.5 out of 125
Correct answers are hidden.
Score for this quiz: 122.5 out of 125
Submitted Mar 26 at 11:21am
This attempt took 56 minutes.
Question 1
2..5 pts
Indicate whether each of the following structures is based on actin filaments (A), microtubules
(M), or intermediate filaments (I). Your answer would be a five-letter string composed of letters
A, M, and I only; e.g. AAAMM.
( ) The cell cortex
( ) The mitotic spindle
( ) The nuclear lamina
( ) Cilia
( ) Filopodia
AMMIM
AMIMA
, 4/9/24, 5:32 PM Quiz: Basic Cell Biology and Cell Membrane Structure: MSCI660: Principles of Cellular Biology (D03)
MAIMI
MMAIM
IMAMA
Question 2
2..5 pts
F-actin is not a straight polymer but can be considered a double-helical assembly. The two
protofilaments twist around each other and cross over approximately every 13 actin subunits,
and the subunits in each protofilament are repeated every 2.8 nm along the helix. F-actin is
almost 8 nm wide. Different myosin motors have different “step lengths” on actin depending on their
function. Which of the following step lengths would you expect to belong to a processive myosin
motor that carries large cellular cargoes such as endocytic vesicles?
About 2.8 nm
About 8 nm
About 13 nm
About 27 nm
About 36 nm
Question 3
2..5 pts
The actin-nucleating protein formin has flexible “whiskers” containing binding sites that help
recruit actin subunits in order to enhance polymerization by this protein. What protein would
you expect to bind to these sites?
Thymosin
Profilin
Cofilin
Gelsolin
Tropomodulin
Question 4
2..5 pts
Which of the following actin-binding proteins cannot bind to the same actin filament simultaneously?
Gelsolin and tropomodulin
Tropomyosin and tropomodulin
Online Residential Athletics Request Info Apply Now Visit Us Create Guest Sign In
Account
Quiz: Basic Cell Biology and Cell Membrane
Structure
Due Mar 31 at 11:59pm
Points 125
Questions 50
Time Limit 75 Minutes
Instructions
The quiz:
Covers the Learn material from Module 1: Week 1 – Module 2: Week
2. Contains 50 multiple-choice questions.
Is limited to 75 minutes.
Allows 1 attempt.
Is worth 125 points.
Submit this assignment by 11:59 p.m. (ET) on Sunday of Module 2: Week 2.
Attempt History
Attempt Time Score
LATEST Attempt 1 56 minutes 122.5 out of 125
Correct answers are hidden.
Score for this quiz: 122.5 out of 125
Submitted Mar 26 at 11:21am
This attempt took 56 minutes.
Question 1
2..5 pts
Indicate whether each of the following structures is based on actin filaments (A), microtubules
(M), or intermediate filaments (I). Your answer would be a five-letter string composed of letters
A, M, and I only; e.g. AAAMM.
( ) The cell cortex
( ) The mitotic spindle
( ) The nuclear lamina
( ) Cilia
( ) Filopodia
AMMIM
AMIMA
, 4/9/24, 5:32 PM Quiz: Basic Cell Biology and Cell Membrane Structure: MSCI660: Principles of Cellular Biology (D03)
MAIMI
MMAIM
IMAMA
Question 2
2..5 pts
F-actin is not a straight polymer but can be considered a double-helical assembly. The two
protofilaments twist around each other and cross over approximately every 13 actin subunits,
and the subunits in each protofilament are repeated every 2.8 nm along the helix. F-actin is
almost 8 nm wide. Different myosin motors have different “step lengths” on actin depending on their
function. Which of the following step lengths would you expect to belong to a processive myosin
motor that carries large cellular cargoes such as endocytic vesicles?
About 2.8 nm
About 8 nm
About 13 nm
About 27 nm
About 36 nm
Question 3
2..5 pts
The actin-nucleating protein formin has flexible “whiskers” containing binding sites that help
recruit actin subunits in order to enhance polymerization by this protein. What protein would
you expect to bind to these sites?
Thymosin
Profilin
Cofilin
Gelsolin
Tropomodulin
Question 4
2..5 pts
Which of the following actin-binding proteins cannot bind to the same actin filament simultaneously?
Gelsolin and tropomodulin
Tropomyosin and tropomodulin
