The above diagram is an example of
a. a closed circulatory system with one heart.
b. an open circulatory system with one heart.
c. a closed circulatory system with a threechambered
heart.
d. an open circulatory system with a twochambered
heart.
e. a closed circulatory system with a fourchambered
heart.
A
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DNA studies can be used to make all of the following conclusions except that
A. The gibbon ape line diverged about 15 million years ago. B. Orangutans split off about 10 million years ago. C. The gorilla lineage diverged about 8 million years ago. D. Modern man remained changeless for the last 1 million years.
Which of the following causes DNA to wrap tightly
around histones essentially preventing transcription? a. methylation b. acetyl CoA c. nitrogenation d. dehydration e. carbonation
The primary mechanism for exchange of substances across the capillary wall is
A) bulk flow. B) vesicle transport. C) active transport. D) mediated transport. E) diffusion.
If a base sequence in DNA reads GCA, what will be the corresponding codon in the mRNA?
A) GCU B) CGT C) GCT D) ACG E) CGU