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PCB 3023 Molecular Cell Biology Exam 1 Questions & Verified Solutions

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Pass PCB 3023 Exam 1 with verified solutions on cell characteristics, DNA repair, protein structure, organelles, and macromolecules.

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PCB 3023 MOLECULAR CELL BIOLOGY
EXAM 1 QUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS 100% CORRECT


Amino acids - correct answer- - Amino group (NH2)
- Carboxyl group (COOH)
- alpha carbon (central C)
- side chain (variable) = give the amino acid its identity


ATP - correct answer- Hydrolyzed to release energy


Base excision repair - correct answer- general repair
mechanism for nucleotide damage
- damaged bases are excised and replaced
- DNA glycosylase removes the base, endonuclease cleaves the
phosphodiester bond, deoxyribosephosphodiesterase removes
the remaining sugar and phosphate
- polymerase adds new nucleotide
- Ligase seals the nick


Cell Characteristics - correct answer- - fundamental units
of life

, - all cells came from an ancestral cell
- enclosed by a plasma membrane
- cells are essentially the same in chemical composition


Centromere - correct answer- - point of junction
between sister chromatids in a chromosome
- if a chromosome was cut, the part with the centromere only
would get passed on


Chaperones - correct answer- Bind to polypeptides to
maintain an unfolded state


Chromosome structure - correct answer- - nucleosomes:
basic units of DNA organization
- chromatin
- chromatin fiber
- condensed chromsome


Condensation reactions - correct answer- water is
removed by H and OH of subunits which form macromolecules =
dehydration synthesis

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