PCB 3023 Exam 1 Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.
10 views 0 purchase
Course
PCB 3023
Institution
PCB 3023
formation of macromolecules by condensation reactions - subunits are added to one end of a
growing chain by dehydration synthesis
What Constrains the size of a cell? - The ratio of surface area to volume. Smaller cells have a
greater surface area to volume ratio.
Miller-Urey experiment - recrea...
PCB 3023 Exam 1
formation of macromolecules by condensation reactions - subunits are added to one end of a
growing chain by dehydration synthesis
What Constrains the size of a cell? - The ratio of surface area to volume. Smaller cells have a
greater surface area to volume ratio.
Miller-Urey experiment - recreated conditions thought to exist in the atmosphere of primitive
earth. No Oxygen!
Used heat to simulate sun, electric discharge to simulate lightning, and cooling to condense molecules to
liquid form.
7 simple molecules: water vapor, nitrogen, ammonia, co2, co, methane, and hydrogen.
Miller-Urey results - With each round of heating, energy radiation, and cooling, more complex
organisms were formed:
1. aldehydes
2. simple acids
3. more complex acids
Suggests organic molecules can form under abiotic conditions.
Ribozome catalyzed reactions - observed in:
genome replication in some RNA viruses
intron splicing
ribosome function in translation
Evidence for RNA World - 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 - self-replicating RNA and other life-promoting molecules inside a phospholipid
membrane
Surface area to volume ratio - radius = 1cm -> Surface area : volume ratio is ~ 3:1
Radius = 10cm -> Suface area : volume ratio is ~ 1:3
High sa : v ratio means - 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 - no nucleus
no organelles
single chromosome (in nucleoid area) +plasmids
cell wall
capsule
most diverse of cells
Photosynthetic bacteria - obtain energy from sunlight. have internal system of membranes where
photosynthesis occurs.
chemosynthetic - derive energy from oxidation of H2S.
ex. Filamentous Beggiatoa
Mitochondria - 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)
enclosed by double membrane
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICMATERIALS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.