Stromatolites (pictured here) are rocky structures that generally form in shallow waters from the binding of sediment by microbial biofilms. stromatolites are typically hypothesized to be formed from the presence of cells that bind these grains together. if the appearance of the stromatolites in the fossil record were to indicate the emergence of life on earth, which cell types would most likely be responsible for their formation? a) prokaryotic cells b) eukaryotic yeast cells c) eukaryotic plant cells d) eukaryotic animal cells

Did you know that a blue wales tongue weighs more than an elephant?

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?