What structure may have acted as a boundary for a cell-like environment before protocells formed?
A) clay
B) acidic water from volcanic springs
C) chambers in rocks
D) lipid membrane
E) metal ions from rocks
Correct Answer:
Verified
Q30: Before DNA, _ likely served as the
Q31: Astrobiologists believe _ is an essential component
Q32: A rise in oxygen in Earth's air
Q33: The oldest multicellular eukaryote, a(n) _, can
Q34: Which process or element was present first?
A)aerobic
Q36: Mitochondria most resemble _.
A)archaeans
B)aerobic bacteria
C)cyanobacteria
D)early eukaryotes
E)anaerobic bacteria
Q37: Ribosomes can catalyze formation of peptide bonds.
Q38: The metabolic reactions that occur in all
Q39: In simulations of tidal flat conditions, amino
Q40: Stromatolites were formed by _.
A)animals
B)heterotrophic bacteria
C)photosynthetic bacteria
D)red
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