Which of the following components is found in DNA, but not in RNA?
A. Cytosine
B. Guanine
C. Adenine
D. Thymine
D. Thymine
Anatomy & Physiology
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The substance that an enzyme acts upon is its
A. active site. B. product. C. catalyst. D. substrate.
Anatomy & Physiology
The normal pacemaker of the heart is located in
A) the Purkinje fibers. B) the sinoatrial node. C) the atrioventricular node. D) the wall of the left ventricle. E) both the left and right ventricles.
Anatomy & Physiology
The completion of a functioning placenta marks the beginning of the ________ period of development.
A. embryonic B. fetal C. pre-embryonic D. postnatal
Anatomy & Physiology
Which of the following bones are located in the hand?
A. Metatarsals B. Metacarpals C. Calcaneus D. Tarsals
Anatomy & Physiology