The major difference between protostome animals and deuterostome animals is _______.
a) whether or not they reproduce sexually or asexually
b) the presence or absence of a gastrovascular cavity
c) which opening to the digestive system forms first
d) their type of symmetry
Ans: c) which opening to the digestive system forms first
You might also like to view...
Substance E is made in the pancreas, travels through the blood, and binds to a surface receptor on a target cell. After
dimerization and autophosphorylation, the receptor activates a signaling protein. Substance E is therefore the ligand for ____.
a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase
Behavior that increases the reproductive success of the individual performing it is most specifically termed ________
a. adaptive b. acoustical c. sexual d. instinctive
Which factor is the most important algal contribution
to the fungal component of a lichen? a. improved water conservation b. mechanical protection c. photosynthetically derived food d. conversion of nitrogen gas to nitrates e. pigment for camouflage
Which of the following is true of a cell membrane?
A. They allow all substances to pass B. It's selectively permeable C. Cell membranes surround plant, animal, and bacteria cells D. It's a bi-layer composed of phospholipids and proteins