Which is a thyroid hormone produced by many animals that encourages bones to take up and incorporate calcium?
A. Calcitonin
B. Glucagon
C. Insulin
D. Parathyroid
E. Melatonin
Answer: A
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Choose the true statements about the human and mouse genomes.
_____ The human genome shares 99% of its genes with the mouse genome. _____ A comparison of genomes confirms that mice and humans shared a common ancestory more recently than humans and pufferfish. _____ Very few genes are conserved in the two genomes. _____ Little rearrangement of genes has occurred in the two genomes.
d. The neurotransmitter opens ion channels in the dendrite’s plasma membrane.
a. The plasma membrane is depolarized, resulting in a decrease in the voltage across the neuron membrane. b. Sodium ions enter the neuron. c. An electrical signal is received by the dendrite, and it then travels passively to the neuron body. d. The neurotransmitter opens ion channels in the dendrite’s plasma membrane.
In response to gonadotropin releasing hormone (GnRH), the anterior pituitary secretes:
a. estrogen or testosterone b. sex stimulating hormone c. progesterone d. leutinizing hormone and follicle-stimulating hormone e. prolactin
The mitotic spindle is made of:
a. motor proteins. b. condensin. c. histones. d. Z rings. e. microtubules