DNA is a polymer of ________, which consist of a sugar, a phosphate group, and a ________
A) proteins; nucleotide
B) amino acids; nucleotide
C) nucleotides; nucleic acid
D) nucleic acids; nucleotide
E) nucleotides; nitrogenous base
E
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The external genitalia do not become clearly differentiated until about week ____ of development
A. 6 B. 12 C. 20 D. 32 E. 38
________________________________________ epithelial tissue lines the urinary tract
Fill in the blank(s) with correct word
The function of helper T-lymphocytes is to
A. initiate and oversee the immune response. B. trigger cell death by disrupting metabolic activities. C. secrete toxins to kill or disable pathogens. D. turn off the immune response once it has been activated. E. All of the choices are correct.
Which of the following bones does not form by endochondral ossification?
A. Scapula B. Clavicle C. Calcaneus D. Ulna E. Femur