The backbone of a DNA molecule is a chain of ________.
alternating deoxyribose sugar and phosphate
alternating phosphate and nitrogen
alternating nitrogenous bases
alternating deoxyribose and ribose sugars
alternating deoxyribose sugar and phosphate
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Most of the neurons in the brain and spinal cord are
A. unipolar B. bipolar. C. multipolar. D. nonpolar.
At which location in the figure do sperm and seminal vesicle secretions first join together in their path to the exterior?
a) C b) J c) E d) K e) L
During the formation of a long bone by endochondral ossification, osteoblasts first begin to lay down spongy bone in the ______________
Fill in the blank(s) with the appropriate word(s)
Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A. Tegmentum B. Cerebral cortex C. Pons D. Inferior colliculi E. Substantia nigra