submucosal layer of GI tract components
What will be an ideal response?
blood vessels, lymphatic vessels, nerves
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How do eukaryotic plant and animals cells differ from one another?
A. Animal cells have mitochondria and plant cells have chloroplasts. B. Plant cells have a vacuole and animals cells don't. C. Animal cells have endoplasmic reticulum and plant cells don't. D. Animal cells have a plasma membrane and plant cells have a cell wall.
How does the hypothalamus of the sexually mature human male regulate reproductive hormone levels?
a. The hypothalamus continuously secretes large amounts of GnRH. b. The hypothalamus responds to low levels of testosterone by synthesizing and releasing testosterone. c. The hypothalamus secretes GnRH in brief pulses every two to three hours. d. The hypothalamus secretes LH in response to high levels of testosterone. e. The hypothalamus responds to low levels of GnRH by synthesizing and releasing testosterone.
Bryophytes have all of the following characteristics except
A) multicellularity. B) specialized cells and tissues. C) lignified vascular tissue. D) walled spores in sporangia. E) a reduced, dependent sporophyte.
Newly synthesized membrane lipids are found in both halves of membrane bilayers because they are
a. synthesized on both surfaces. b. removed and transported to these locations by lipid transport proteins. c. synthesized on one surface and flip spontaneously to the other surface. d. synthesized on one surface and flipped to the other surface by proteins called flippases.