Which of the following bases is not found in RNA?
A. adenine
B. guanine
C. thymine
D. cytosine
E. uracil
C
Biology & Microbiology
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The organ of the lymphatic system where T cells mature is the
A. spleen. B. thymus. C. tonsil. D. lymph node. E. heart.
Biology & Microbiology
Circulation in the accompanying diagram functions primarily as a(n) ____
a. an open circulatory system b. system consisting of mostly of tissue spaces c. closed circulatory system d. interstitial fluid system e. three-directional system
Biology & Microbiology
Social behavior in which both the "actor" and the "recipient" benefit is known as ________. [three words]
Fill in the blank(s) with correct word
Biology & Microbiology
Myosin and actin are the major contractile proteins in _______ muscle.
A. cardia B. smooth C. skeletal D. two of the above E. all of the above
Biology & Microbiology