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27 Cards in this Set
- Front
- Back
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How do we know all life comes from a common ancestor?
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The evidence we have that we all originate from a common ancestor is the common features among living organisms.
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When was the origin of earth come to be?
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4.5 billion years ago
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When was the first living organism dated?
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3.5 - 3.9 billion years ago
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What's the recipe for prebiotic soup?
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Methane, Ammonia, Water, & Carbon Dioxide. Mix that shit.
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What is the main assumption held by most scientists about the origin of life on earth?
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Life originated from inanimate matter through spontaneous and gradual increase of molecular complexity.
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What is the NASA definition of life?
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Life is a self-sustained chemical system capable of undergoing Darwinian evolution.
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There are three different organisms on the slide (sea urchin, rat, and seeweed). How does genetic material defines each species?
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Each species reproduces itself faithfully. The phenomenon of heredity is a central part of the definition of life.
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Where is hereditary information stored?
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DNA. Duh.
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What process do ALL cells use to replicate their DNA?
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templated polymerization
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In transcription what happens to the newly synthesized strand in comparison to replication?
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The strand falls off in transcription
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In replication how many strands are made?
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Only one strand is made.
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What property of RNA allows it to fold?
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It is single stranded.
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come up with ?
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Most of the reactions are catalyzed by enzymes that are proteins. All cells use proteins as catalysts.
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What is the catalytic site used for in a protein?
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The place where the reactants bind to activate the catalyst.
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Why do gram negative bacteria have a thinner peptidoglycan layer?
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ask him
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How many sugar residues in the polysaccharide chain get binded to the lysozyme molecule?
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about 6
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(clarify what he was talking about)
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The feedback loop is the basis of the autocatalytic, self-reproducing behavior of living organisms.
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How is a cell a factory?
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All cells function as biological factories dealing with the same basic molecular building blocks.
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Can gases pass the lipid bilayer? If so why?
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Yes they can because of their hydrophobic nature.
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What is the minimal genetic material needed to be present in a living cell?
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A living cell can exist with fewer than 500 genes?
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What are three means organisms acquire energy?
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1. organotrophic
2. phototrophic 3. lithotrophic |
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What is the relationship between tube worms and bacteria?
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There is a symbiotic relationship.
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What form is nitrogen present in the environment and what must be done for it to become useful?
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It occurs naturally as N2. N2 has to be fixed into ammonia before it can be used into a biosynthetic factor?
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What does Ananbaena cylindrica do?
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1. fixes carbon dioxide
2. fixes nitrogen However transfer of the genes in the bacteria cannot transfer on its own. |
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What are the three main branches of the tree of life?
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Bacteria, Archaea, and Eucaryotes
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Which molecule of RNA or DNA would ...
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All the organisms must have this molecule.
[incomplete] |
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Is there such thing as de novo synthesis?
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There is no such thing.
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