The longest vein in the body is the
A) small saphenous vein.
B) great saphenous vein.
C) sartorius vein.
D) cephalic vein.
E) femoral vein.
B) great saphenous vein.
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During breastfeeding, as the baby suckles, nerve signals are relayed from the mother's nipple to the mother's brain. The brain initiates the mother's pituitary gland to produce more prolactin (a hormone), which causes more milk to be ejected. This process of breastfeeding is an example of
A. positive feedback. B. feedforward regulation. C. negative feedback. D. acclimatization. E. adaptation.
A primary immune response ________, and a secondary immune response ________.
A. produces antibodies within five to ten days of exposure to antigens; produces antibodies within a day or two of a subsequent exposure to the same antigen B. occurs only in children; occurs only in adults C. is very rapid in producing antibodies after exposure to antigens; is very slow in producing antibodies after exposure to antigens D. is very important; is less important to the body's ability to protect itself
A protein channel that opens or closes in response to a stimulus would be classified as a ______ channel.
A. leak B. gated C. stimulus
The chief protein components of chromatin, called histones, serve what role?
a) they help organize and condense the DNA by forming nucleosomes b) they come together to form the sugar-phosphate backbone of the DNA c) they catalyze important chemical reactions within the nucleus d) they undergo complementary base pairing and help hold the double-stranded DNA molecule together