Precambrian time
What will be an ideal response?
earth formed during this time
oxygen began to accumulate in the atmosphere during this era
protist evolved and diversified during this era
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Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
What will be an ideal response?
Stromatolites are fossils of ancient, photosynthetic cyanobacteria
Indicate whether the statement is true or false.
In a lipid bilayer, the _____ of all the lipid molecules are sandwiched between all the _____
a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails
Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. D. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells.