Which is another name for bone cells that remain alive even after the extracellular matrix becomes hardened with calcium phosphate crystals?
A. leukocytes
B. fibrocytes
C. chrondrocytes
D. erythrocytes
E. osteocytes
Answer: E
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Which of the following statements is NOT true about fluid feeders?
a. They may have long tongues to effectively extract nectar from plants. b. They may gather organic material from soil located nearby. c. They may have piercing mouth parts to obtain blood from a host. d. They may secrete enzymes on a food source and consume it once it is liquefied. e. They may inject anticoagulants into a host to inhibit blood from clotting.
The region of chromosomes that codes for most of the rRNAs is called the
a. nucleolus. b. nucleolar organizing region. c. ribosomal assembly region. d. ribosomal organizer region.
An operon turned ON in response to the presence of a substrate is called
a. inducible b. repressible c. restricting d. anabolic.