Receptors for both leptin and insulin (peptide hormones) are located in many parts of the nervous system, but most are in the hypothalamus, particularly in the _______________.
Fill in the blank(s) with the appropriate word(s).
Arcuate nucleus
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Water flows into the source end of a sieve tube because _____
A) sucrose has diffused into the sieve tube, making it hypotonic B) sucrose has been actively transported into the sieve tube, making it hypertonic C) water pressure outside the sieve tube forces in water D) the companion cell of a sieve tube actively pumps in water E) sucrose has been transported out of the sieve tube by active transport
In humans, a gene that has been identified as causing a type of skin cancer is the
a. mutant superman. b. sonic hedgehog. c. superhero aardvark. d. superwoman echidna. e. mutant mole rat.
Which of the following communication signals matches the animal?
a. chemical; honeybees b. tactile; frogs c. auditory; baboons d. visual; frogs e. chemical; fireflies
Most human cell contains....... chromosomes:
a. 23 b. 46 c. 20 d. 100 trillions