A geographic barrier
A. is an isolating mechanism.
B. can stop gene flow.
C. is important for speciation to take place.
D. All of these answers are true.
D. All of these answers are true.
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If water molecules (H2O) suddenly stopped forming hydrogen bonds with one another, how would water transport in vascular plants change (if at all)?
A. It would remain the same, as H2O molecules also form oxygen bonds. B. It would remain the same, as water transport only depends on osmosis. C. It would stop, as water transport relies on H2O molecules being connected by hydrogen bonds. D. It would increase, as hydrogen bonds inhibit water transport.
Which group was first to have an amniotic egg?
a. birds b. reptiles c. amphibians
d. bony fishes e. mammals
The theory that chloroplasts and mitochondria had their evolutionary beginnings in eukaryotic cells as endosymbionts is supported by all of the following EXCEPT:
a. chloroplasts and mitochondria are completely autonomous within eukaryotic cells. b. chloroplasts and mitochondria have DNA. c. chloroplasts and mitochondria have small ribosomes for protein synthesis. d. chloroplasts and mitochondria are approximately the same size as prokaryotic cells. e. chloroplasts and mitochondria have the same shape as prokaryotic cells.
Parietal cells secrete pepsinogen. Indicate whether the statement is true or false