Which of the following molecules would most likely require a transport protein to cross the plasma membrane of a red blood cell?
A. CO2
B. H2O
C. O2
D. C6H12O6
Answer Key: D
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The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. trachea. C. alveoli. D. parabronchi. E. spiracles.
In an mRNA transcript, the 3' UTR refers to the region of the mRNA that is ____
a. upstream from the start codon b. upstream from the site for initiation of transcription c. downstream from the stop codon d. the coding region e. downstream from the site for termination of transcription
Laminaria is the genus of kelp that dominates in:
a. the Pacific coast. b. the South Atlantic. c. the Tropical Pacific. d. the North Atlantic. e. the Indian Ocean.
The term reproductive isolation mechanism refers to ____
a. specific areas where males compete or display for females b. the process by which sexual selection evolves within a population
c. a blockage of gene flow between populations d. the inability of a species to continue reproduction e. legal limits to procreation