Which of the following is properly matched?
A. Osteoblasts and bone breakdown
B. Osteocytes and initial bone formation
C. Osteoclasts and initial bone formation
D. Osteoclasts and bone breakdown
E. Osteoblasts and cartilage formation
Answer: D
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There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome
by excessive mutations. Since the rotifers develop from eggs, but asexually, what can you predict? A) The eggs and the zygotes are all haploid. B) The animals are all hermaphrodites. C) While asexual, both males and females are found in nature. D) All males can produce eggs. E) No fertile males can be found.
The integrase enzyme is responsible for inserting bacteriophage ? into the host genome
Indicate whether the statement is true or false
Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by
A) a germline mutation. B) two somatic mutations in the same lung cell. C) exposure to carcinogens. D) stress from caring for her husband, who had a spinal cord injury.
Which of the following will stimulate a B cell to divide and produce antibodies?
a. binding a foreign antigen to its surface receptors b. phagocytosis of a foreign antigen c. stimulation by complement d. signals released from damaged mucosa e. uptake of bacterial toxins