Cells require one particular monosaccharide as a starting material to synthesize nucleotide building blocks. Which of the monosaccharides below fills this important role?
(a) glucose
(b) fructose
(c) ribulose
(d) ribose
(d)
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A group is considered paraphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. the common ancestor of the group is not included in the group. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
Most cells have a negative plasma membrane potential (Vm) because they have
A) equal concentrations of ions on both sides of the membrane. B) an excess of negatively charged solute molecules inside the cell. C) an excess of positively charged solute molecules inside the cell. D) an excess of negatively charged solute molecules outside the cell. E) an excess of water molecules inside the cell.
When oxygen is released as a result of photosynthesis, it is a direct by-product of _____
A) splitting water molecules B) chemiosmosis C) the electron transfer system of photosystem I D) the electron transfer system of photosystem II
A given medium can be either selective or differential but not both.
Answer the following statement true (T) or false (F)