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NAS 2 Challenge Exam TCC – Questions and Answers
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NAS 2 Challenge Exam TCC – Questions and Answers
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NAS 2 Challenge Exam TCC – Questionsand Answers
Nucleus - -brain of the cell, directs cell activity and contains chromosomes
made of DNA
-Endoplasmic Reticulum - -"intracellular highway", transports items around
the cell, creates lipids of fat
-Lysosome - -An organelle containing digestive enzymes
-Cytoplasm - -A jellylike fluid inside the cell in which the organelles are
suspended
-golgi apparatus - -A system of membranes that modifies and packages
proteins for export by the cell
-ribosomes - -site of protein synthesis
-mitochondria - -Powerhouse of the cell, organelle that is the site of ATP
(energy) production
-cell membrane function - -1) keep toxic substances out of cell
2) has receptors that allow molecules to pass between organelles
3) separate vital/incompatible metabolic processes in organelles
-concentration gradient - -difference in the concentration of a substance
from one location to another
-simple diffusion - -hydrogen bonds form between water molecules and
solutes
-facilitated diffusion - -Movement of specific molecules across cell
membranes through protein channels
-osmosis - -Diffusion of water through a selectively permeable membrane
-active transport - -the movement of ions or molecules across a cell
membrane into a region of higher concentration, assisted by enzymes and
requiring energy.
-endocytosis - -the taking in of matter by a living cell by invagination of its
membrane to form a vacuole.
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