The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the _____
A) amphibians
B) birds
C) fishes
D) mammals
E) reptiles
Answer: C
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How are steroid hormone receptors and cell-surface receptors similar?
A. When bound to their ligand, both types enter the nucleus to activate transcription. B. Both types cause GDP to be exchanged for GTP in a G protein. C. Both types undergo a conformational change when they bind to their ligand. D. When activated the signals of both types are transduced across the plasma membrane.
The Irish potato famine in the 1840's was caused in large part by a proliferation of a(n)
A. Paramecia B. Oomycote C. Dinoflagellate D. Chlorophyte E. Fungus
What is photorespiration? Describe how C4 plants have evolved the ability to reduce photorespiration
What will be an ideal response?
Because most of the trunk of a tree is made of xylem, it is safe to say that most of the tissue in a tree is
A) dividing rapidly. B) manufacturing sugars. C) conducting sugars. D) used for storage. E) dead.