Chapter 6 Flashcards
1
Q
prokaryotic cells are characterized by having:
A
- no nucleus
- DNA in an unbound region called the nucleoid
- no membrane-bound organelles
- cytoplasm bound by the plasma membrane
2
Q
Eukaryotic cells are characterized by having:
A
- DNA in a nucleus that is bounded by a membranous nuclear envelope
- membrane-bound organelles
- cytoplasm in the region between the plasma membrane and nucleus
- usually much larger than prokaryotic cells
3
Q
the cytoskeleton is composed of:
A
- microtubules
- microfilaments
- intermediate filaments
4
Q
microtubules:
A
the thickest of the three components of the cytoskeleton
5
Q
microfilaments (actin filaments)
A
the thinnest components of the cytoskeleton
6
Q
intermediate filaments
A
fibers with diameter in a middle range
7
Q
protein subunits of microtubules:
A
tubulin (a dimer consisting of u-tubulin and beta-tubulin)
8
Q
protein subunits of microfilaments(actin filaments):
A
actin
9
Q
protein subunits of intermediate filaments:
A
one of several different proteins
10
Q
structure of microtubules:
A
hollow tubes
11
Q
structure of microfilaments (actin filaments):
A
two intertwined strands of actin
12
Q
structure of intermediate filaments:
A
fibrous proteins coiled into cables
