Osteogenesis imperfecta can be caused by abnormally formed
A. hydroxyapatite.
B. proteoglycans.
C. collagen.
D. osteoblasts.
E. calcium.
C
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Terminal bronchioles of the lower respiratory system are lined with
A. keratinized stratified squamous epithelium. B. simple cuboidal epithelium. C. pseudostratified ciliated columnar epithelium. D. stratified columnar epithelium. E. nonkeratinized stratified squamous.
Which statement accurately describes alveolar and systemic gas exchanges?
A. In both alveolar and systemic gas exchange, oxygen diffuses out of the blood. B. In both alveolar and systemic gas exchange, oxygen diffuses toward the blood. C. In alveolar gas exchange oxygen diffuses into the blood, but in systemic gas exchange it diffuses out of the blood. D. In alveolar gas exchange oxygen diffuses out of the blood, but in systemic gas exchange it diffuses into the blood.
The RNA responsible for bringing the amino acids to the "factory" site for protein formation is ________.
A) rRNA B) mRNA C) tRNA D) ssRNA
Chondroblasts ________.
A) are mature cartilage cells located in spaces called lacunae B) within the cartilage divide and secrete new matrix C) located deep to the perichondrium divide and secrete new matrix on the internal portions of the cartilage D) never lose their ability to divide