PCB 3023 Exam 1 Study Guide with
Complete Solutions
Flow of genetic information in all living cells - Answer️️ -DNA ->
RNA -> Protein
Replication-> Transcription -> Translation
Miller-Urey experiment - Answer️️ -recreated conditions thought to
exist in the atmosphere of pr...
Evidence for RNA World - Answer✔️✔️-RNA can catalyze the
polymerization of nucleotides, including the synthesis of
complementary RNA, using itself as a template. Not observed in
DNA.
The first cell - Answer✔️✔️-self-replicating RNA and other life-
promoting molecules inside a phospholipid membrane
What Constrains the size of a cell? - Answer✔️✔️-The ratio of surface
area to volume. Smaller cells have a greater surface area to volume
ratio.
Surface area to volume ratio - Answer✔️✔️-radius = 1cm -> Surface
area : volume ratio is ~ 3:1
Radius = 10cm -> Suface area : volume ratio is ~ 1:3
Molecular Cell Biology PCB 3023 BROWARD COLLEGE/ UNIVERSITY of
SOUTH FLORIDA/ UCF COLLEGE Of Sciences
High sa : v ratio means - Answer✔️✔️-more membrane per unite of
volume. important for the cell to interact with its environment.
smaller cell interact more efficiently; less likely to lose energy as
heat to surroundings.
prokaryotic cell - Answer✔️✔️-no nucleus
no organelles
single chromosome (in nucleoid area) +plasmids
cell wall
capsule
most diverse of cells
Photosynthetic bacteria - Answer✔️✔️-obtain energy from sunlight.
have internal system of membranes where photosynthesis occurs.
chemosynthetic - Answer✔️✔️-derive energy from oxidation of H2S.
ex. Filamentous Beggiatoa
Mitochondria - Answer✔️✔️-organelles found in most eukaryotic cells
and generate most of the cell's supply of usable energy. extract
energy from food
DNA-containing organelles (endosymbionts)
3
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