BIOL 230 Chapter 3 QUESTIONS WITH ANSWERS.

BIOL 230 Chapter 3 QUESTIONS WITH
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ANSWERS

plasma membrane - CORRECT ANSWERS ✔✔The
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membrane at the boundary of every cell that acts as a
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selective barrier, thereby regulating the cell's chemical
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composition.


Cytoplasm - CORRECT ANSWERS ✔✔A jellylike fluid inside
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the cell in which the organelles are suspended
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Cystosol - CORRECT ANSWERS ✔✔- liquid part of
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cytoplasm organelles are suspended in it |\ |\ |\ |\ |\




- site of many chemical reactions required for a cell's
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existence
- 75-90% water plus various dissolved and suspended
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components. Among these are different types of ions, |\ |\ |\ |\ |\ |\ |\ |\



glucose, amino acids, fatty acids, proteins, lipids, ATP,
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and waste products.
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Organelles - CORRECT ANSWERS ✔✔A tiny cell structure
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that carries out a specific function within the cell
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,Nucleus - CORRECT ANSWERS ✔✔- A part of the cell
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containing DNA and RNA and responsible for growth and
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reproduction


nuclear envelope - CORRECT ANSWERS ✔✔A double
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membrane made of a lipid bilayer that separates the
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nucleus from the cytoplasm |\ |\ |\




Nuclear pores - CORRECT ANSWERS ✔✔holes in the
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nuclear envelope that allow materials to pass in and out
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of the nucleus
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Nucleoli - CORRECT ANSWERS ✔✔Areas in nucleus with
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high concentrations of protein and RNA molecules;
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ribosomes assembled here |\ |\




Chromatin - CORRECT ANSWERS ✔✔granular material
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visible within the nucleus; consists of DNA tightly coiled
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around proteins |\




nucleosome - CORRECT ANSWERS ✔✔repeating subunit |\ |\ |\ |\ |\ |\



of chromatin fibers, consisting of DNA coiled around
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proteins called histones |\ |\

, Linker DNA - CORRECT ANSWERS ✔✔holds adjacent
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nucleosomes together. |\




Chromatin fiber - CORRECT ANSWERS ✔✔consists of |\ |\ |\ |\ |\ |\ |\



coiled nucleosomes which form a larger diameter fiber.
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Chromosome - CORRECT ANSWERS ✔✔- Just before cell |\ |\ |\ |\ |\ |\ |\ |\



division takes place, the DNA replicates (duplicates) and
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the loops condense even more to form short, thick
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structures


- a single chromosome consists of a pair of identical
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strands called sister chromatids, which are connected at a
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region called the centromere . Human somatic (body)
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cells have 46 chromosomes, 23 inherited from each
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parent


Genome - CORRECT ANSWERS ✔✔all of an organism's
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genetic material |\




fluid mosaic model - CORRECT ANSWERS ✔✔Structural
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model of the plasma membrane where molecules are free
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to move sideways within a lipid bilayer.
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