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Chapter 4 Part 3
Test Description: .
Instructions: Answer all questions to get your test result.
1) Why do scientists believe that mitochondria may have been a separate cell at one time? (endosymbiotic theory)
A
They have their own nucleus and organelles.
B
They can leave their host cell at any time.
C
They produce their own food using photosynthesis.
D
They have their own DNA and divide on their own to reproduce.
2) This organelle modifies, packages and ships proteins where they need to go.
A
Golgi apparatus
B
endoplasmic reticulum
C
ribosome
D
rough endoplasmic reticulum
3) This organelle digests foreign DNA, old organelles, viruses and ingested bacteria.
A
Golgi apparatus
B
ribosome
C
endoplasmic reticulum
D
lysosome
4) This cell structure is a network of protein strands located in the cytosol.
A
cytoskeleton
B
Golgi apparatus
C
nucleus
D
smooth endoplasmic reticulum
5) This component of the cytoskeleton is the smallest, is made of actin and is important in cell movement and muscle contraction.
A
microtubule
B
microfilament
C
intermediate filament
D
intermediate tubule
6) This component of the cytoskeleton is medium in size, made of keratin and is important in anchoring the nucleus and organelles.
A
intermediate tubule
B
microtubule
C
microfilament
D
intermediate filament
7) This component of the cytoskeleton is made of tubulin, is the largest in size and is important in the movement of chromosomes during cell division.
A
intermediate filament
B
microtubule
C
intermediate tubule
D
microfilament
8) Which BEST describes the structure of cilia and flagella?
A
A hair growing out of the skin of the cell.
B
A 9x2 arrangement of microfilaments
C
A hairlike structure that grows out of the cell surface
D
A 9x2 arrangement of microtubules
9) Which BEST explains the difference between chromatin and chromosomes?
A
Chromatin is condensed DNA while chromosomes are uncondensed DNA
B
Chromatin is made of RNA while chromosomes are DNA
C
Chromatin is made of DNA while chromosomes are RNA
D
Chromatin is uncondensed DNA while chromosomes are condensed DNA
10) All of these are true about the nucleus EXCEPT.
A
The nucleus contains chromatin in a nuclear matrix.
B
The nuclear envelop contains nuclear pores to let things in and out.
C
The nucleus is surrounded by a double membrane called the nuclear envelop.
D
The nuclear pores allow everything into or out of the nucleus.
*select an answer for all questions
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