When chemoreceptors detect a slight decrease in pH, this means that __________ concentrations have
increased, and the breathing rate must __________.
a. carbon dioxide; increase
b. carbon dioxide; decrease
c. oxygen; increase
d. oxygen; decrease
e. chloride; decrease
A
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What did Charles Darwin propose after observing the 11-inch-long nectaries of the Angraecum sesquipedale orchid in Madagascar?
A. that the orchid was an evolutionary dead end and could no longer reproduce B. the existence of a pollinator moth with a proboscis of 10–11 inches C. the presence of very small bees that can fit into a long nectar tube D. that the orchid must reproduce asexually E. that the orchid was a self-pollinator and required no assistance from an organism
What is the most recent common ancestor of fungi and animals?
A) A protist B) Moss C) A bryophyte D) Algae
In prokaryotes, control of gene expression is mainly at the level of ____.
A. transcription B. transcript processing C. transport D. translation E. post-translation
Part of antibody involved in binding to various cells and molecules of the immune response
A. Fab B. Fc C. Hinge region D. Complement binding site E. Disulfide bonds