Chapter 4 Biology Mcgraw Hill (Tams)
all organisms possess a genetic system based on replication of DNA
supernatural or divine origin
hypothesis that proposes meteors or cosmic dust brought life to earth
panspermia (extraterrestrial origin
life originated from inanimate materials
life most likely emerged under ___ conditions
in a reducing atmosphere, the exact conditions are ___.
there was an ample availabilty of ___ but very little ___.
unknown, hydrogen atoms, oxygen
-the ocean's edge
-under frozen oceans
-deep in the earth's crust
origin-problematic due to necessary conditions (temperature)
origin-byproduct of volcanic activity
origin-was positively charged so it provided catalytic surface
origin-conditions suitable for Archaea
attempted to reproduce early reducing atmosphere and produce organic compounds from inorganic materials
steps of Miller-Urey experiment
1. assembled reducing atmosphere rich in H and excluding gaseous oxygen
2. placed atmosphere over liquid water
3. maintained mixture at a temp lower than 100C
4. simulated lightning by bombarding it with energy in the form of sparks
3 hypotheses of chemical evolution
RNA, Protein, Peptide-Nucleic Acid worlds
c. evolution - molecules could not have consistently formed without a mechanism of heredity (replication)
c. evolution - replication would be impossible without enzymes
c. evolution - RNA is too unstable, thus a precursor must have existed
Peptide-nucleic acid world
certain molecules sontaneously formed bubbles (esp. protein and lipids) that shielded the hydrophobic regions of the molecules from contact with water
chemical concentrating, bubblelike structures
protobionts allowed chemical complexity
there is no major agreement on one ___ theory
resemble prokaryotes-lack a nucleus of more complex eukaryotes
microfossils have been found in rocks as old as ___ yrs
most primitive organisms-extreme condition prokaryotes
archabacteria lack ___ in cell walls (a protein carbohydrate complex)
archaebacteria that produce methane
some archaebacteria were ___(salt lovers) or ___(heat lovers)
archaebacteria are thought to have split from ___ 2 billion years ago
second major group of prokaryotes (contains most modern proks)
bacteria has strong ___ and a simpler ___
cell walls, gene structure
photosynthetic blue-green algae
Eukaryotes arose about ___ years ago
internal membrane-bound structures such as mitochondria and chloroplasts are thought to have evolved via ___
enrgy-producing bacteria were engulfed by larger bacteria which formed a beneficial symbiotic relationship
eukaryotic cells can ___ which carries out genetic recombination, the key to evolution
the development of ___ has arisen many times among eukaryotes and fosters specialization
some cells devote all energies to one task, other cells to another
McGraw Hill Connect Accounting Answers Chapter 4
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Terms to be well versed in
Following are the terms that are expected for students to be well versed with. It is not only the term but its respective entry in the books of accounts, the adjustment entries and their position at the financial statements. To name a few-
- Unearned Revenue
- Accrued Expenses
- Prepaid Expenses
- Trial Balance
- Earnings Per Share
- Operating Expenses And So On.
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