Blood usually continues on from arterioles to ____ in its travel through the human body.
A. other arterioles
B. venules
C. arteries
D. veins
E. capillaries
Answer: E
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Which of the following statements regarding the Ras protein is false?
A) Ras is monomeric. B) It is regulated by GTPase activating proteins. C) The ligands are largely steroid hormones. D) It is regulated by Sos, a guanine nucleotide exchange factor. E) Ras activates a cascade of phosphorylation events.
In a eukarytote, DNA is transcribed in the
a. mitochondria. b. cytoplasm. c. ribosomes. d. nucleus. e. endoplasmic reticulum
The vascular bundles inside a typical eudicot stem are arranged in a characteristic ring, which divides the stem’s
ground tissue into the ____ (inside the ring) and the ____ (outside the ring).
a. cortex; pith b. pith; cortex c. pith; cambium d. cambium; cortex e. cortex; epidermis
Scientists found that different beak shapes correlate with different mating songs in Darwin's finches. Which hypothesis does this support?
A. Darwin's finches are not different species according to the biological species concept. B. Adaptation to different food sources likely occurred after reproductive isolation in Darwin's finches. C. Mating songs are primarily determined by the acoustics of different beaks. D. Adaptation to different food sources led to behavioral isolation in Darwin's finches.