Which of the following is an example of bulk flow during gas exchange in vertebrates?
A. movement of water past a respiratory
surface
B. movement of hemolymph throughout the
body
C. movement of oxygen from the lung into the
bloodstream
D. movement of carbon dioxide from body
cells into the bloodstream
E. All of the answer options are correct.
A
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Genomic studies of bacteria reveal that _____
A) only a few bacterial species have plasmids B) there are usually three copies of each gene present within a bacterial genome C) there are many genes of unknown function D) there is almost no difference between the genomes of diverse bacteria
Which structure gives rise to structures of face, neck and mouth?
a. primitive streak b. neural tube c. notochord d. pharyngeal arches
e. somitesFor a particular gene, if one gene in a million experiences a mutation each generation, what is its mutation frequency?
What will be an ideal response?
The oldest fossils of eukaryotes have been estimated to be
A. 1995 years old. B. 4.5 billion years old. C. 1.5 billion years old. D. 6000 years old. E. 8 billion years old.