What system drains blood from the capillary beds of the digestive tract to a capillary bed in the liver?
A. lymphatic system
B. hepatic portal
C. celiac
D. coronary artery
E. cephalic
Answer: B
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A farmer in Vermont is going to tap a tree in order to make maple syrup. Which of the following plant structures must the farmer break to release (and collect) the sugar-rich base for his syrup?
A. phloem B. xylem C. cuticle
Explain how the heart of a double-pithed frog can continue to contract in an organized manner after the nervous system is destroyed.
What will be an ideal response?
The "pill" works primarily by
a. blocking sperm from entering the uterus. b. causing spontaneous abortions. c. inhibiting the release of FSH and LH. d. preventing implantation of the embryo. e. stimulating the release of GnRH.
What happens to the CFTR gene in individuals who have cystic fibrosis?
a. the entire gene is duplicated b. three bases are duplicated, causing one amino acid to repeat about 40 times c. the entire gene is deleted d. three bases are deleted, causing one acid to be missing