Which of the following statements about bones is false?
A) Bones are dry and dead, made up of calcium and connective fibers with a few blood vessels running through them.
B) Bones are living organs with multiple tissue types and multiple cell types.
C) Blood cells are produced in the bone marrow.
D) Arthritis occurs when the cartilage between bones wears down.
A
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What is the purpose of a selectable marker such as the antibiotic-resistance gene ampR?
A. Selectable markers allow a researcher to identify cells that have incorporated the recombinant plasmid. B. Selectable markers produce antibiotics, which kill cells that have not incorporated recombinant plasmid. C. Selectable markers prevent cells that have incorporated one plasmid from incorporating another. D. Selectable markers allow a researcher to identify the recombinant plasmid. E. Selectable markers are only effective in viral vectors.
Blood vessels that connect networks of capillary beds are
a. arteries. b. veins. c. portal veins. d. both b and c.
The concept of endosymbiosis is widely accepted. What kind of relationship is it?
A. Neither organism benefits. B. One organism in the partnership benefits and the other is harmed. C. One organism benefits but the other is not affected. D. Both organisms in the partnership benefit.
When blood glucose is low, __________ is secreted, which calls for the liver to break down glycogen.
Fill in the blank(s) with the appropriate word(s).