The structure of RNA differs from DNA in that
A) the backbone of RNA contains ribose.
B) RNA contains pyrimidines but not purines.
C) RNA contains purines but not pyrimidines.
D) DNA contains pyrimidines but not purines.
E) DNA contains purines but not pyrimidines.
A
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If the adenyl cyclase activity of liver cells were missing, which of these hormones could no longer stimulate release of glucose?
A) progesterone B) glucagon C) cortisol D) thyroxine E) leptin
Peritonitis, a life-threatening condition, can be caused by a ________.
A. verterbral fracture B. ruptured appendix C. head injury D. punctured lung E. heart attack
The main difference between regular dense and irregular dense connective tissue is how the collagen fibers are arranged.
Answer the following statement true (T) or false (F)
A tissue has the following characteristics: abundant extracellular matrix, abundant collagen fibers, collagen fibers mainly parallel to each other. Which of the following injuries results in damage to mainly this kind of tissue?
A. tear in the tissue that attaches the gastrocnemius muscle to bone B. broken nose C. tear in the cartilage of the knee D. broken femur bone E. bullet penetrating the abdominal wall