Chapter 4 Part 3: Question Preview (ID: 13944)

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Why do scientists believe that mitochondria may have been a separate cell at one time? (endosymbiotic theory)
a) They can leave their host cell at any time.
b) They have their own nucleus and organelles.
c) They produce their own food using photosynthesis.
d) They have their own DNA and divide on their own to reproduce.

This organelle modifies, packages and ships proteins where they need to go.
a) endoplasmic reticulum
b) Golgi apparatus
c) ribosome
d) rough endoplasmic reticulum

This organelle digests foreign DNA, old organelles, viruses and ingested bacteria.
a) endoplasmic reticulum
b) ribosome
c) lysosome
d) Golgi apparatus

This cell structure is a network of protein strands located in the cytosol.
a) cytoskeleton
b) smooth endoplasmic reticulum
c) Golgi apparatus
d) nucleus

This component of the cytoskeleton is the smallest, is made of actin and is important in cell movement and muscle contraction.
a) intermediate tubule
b) intermediate filament
c) microtubule
d) microfilament

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) intermediate filament
c) microfilament
d) microtubule

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 tubule
b) intermediate filament
c) microtubule
d) microfilament

Which BEST describes the structure of cilia and flagella?
a) A 9x2 arrangement of microfilaments
b) A 9x2 arrangement of microtubules
c) A hairlike structure that grows out of the cell surface
d) A hair growing out of the skin of the cell.

Which BEST explains the difference between chromatin and chromosomes?
a) Chromatin is uncondensed DNA while chromosomes are condensed DNA
b) Chromatin is condensed DNA while chromosomes are uncondensed DNA
c) Chromatin is made of DNA while chromosomes are RNA
d) Chromatin is made of RNA while chromosomes are DNA

All of these are true about the nucleus EXCEPT.
a) The nucleus is surrounded by a double membrane called the nuclear envelop.
b) The nucleus contains chromatin in a nuclear matrix.
c) The nuclear envelop contains nuclear pores to let things in and out.
d) The nuclear pores allow everything into or out of the nucleus.

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