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Natural Science CLEP Exam Questions and Answers
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Natural Science CLEP Exam Questions and Answers
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Natural Science CLEPcell - Answer -smallest unit of most living things
organism - Answer -living thing
prokaryotes - Answer -cells that lack a membrane-bound nucleus and membrane-bound organelles
organelles - Answer -small structures in the cytoplasm of a cell that do special jobs
eukoryotic cells - Answer -has a nucleus, has organelles or other cell parts
virus - Answer -particle made up of DNA, RNA, protein, and in some cases lipids that can only replicate
only by infecting living cells
electron microscope - Answer -used to examine tiny cell organelles
cell membrane - Answer -composed of a bilayer of lipids embedded with globular proteins
endocytic vesicles - Answer -Formed when cell membrane surrounds a molecule outside the cell and
ingests it
, microvilli - Answer -projections on cell membrane increase surface area
cytoskeleton - Answer -provides structural support to a cell composed of microtubules, microfilaments,
centrioles
microtubules - Answer -hollow tubes of protein about 25 nanometers in diameter, support the cell and
moves organelles within the cell
microfilaments - Answer -double-stranded chains of proteins which give structure to the cell
centrioles - Answer -tubes, One of two tiny structures located in the cytoplasm of animal cells near the
nuclear envelope; play a role in cell division.
ribosomes - Answer -site of protein synthesis. Free ribosomes - float unattached; attached ribosomes -
attached to the ER
endoplasmic reticulum - Answer -an internal membrane system in which components of cell membrane
and some proteins are constructed. rough - instrumental in protein synthesis; smooth - processes lipids
fats and steroids
golgi apparatus - Answer -stores, packages and ships proteins
secretory vesicles - Answer -packaged protein or other substance produced by golgi
apparatus/endoplasmic reticulum
exocytosis - Answer -process by which a cell releases large amounts of material
lysosomes - Answer -cell organelle filled with enyzmes need to break down certain materials in the cells
mitochondria - Answer -Powerhouse of the cell, organelle that is the site of ATP (energy) production
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