Bioengineering to create organs for transplants involves
A) growing cells without a scaffold.
B) seeding a scaffold of connective tissue matrix with stem cells.
C) transplanting unaltered organs.
D) using 3D printers to make organs that function without copying structure.
Answer: B
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The exchange of a purine-pyrimidine base pair for the other purine-pyrimidine pair is:
A. a silent mutation. B. a transition mutation. C. a frameshift mutation. D. a nonsense mutation. E. a transversion mutation.
In a ________ assay, DNA extracted from a microbial community or environmental sample is incubated with selected complementary probe or sample sequences (often ________) and allowed to hybridize. The level of hybridization to each probe (gene) is measured. Analysis of DNA hybridization thus reveals the presence or absence of the specific genes in the environment. Most importantly, this can be done without ________.
What will be an ideal response?
The main source of light in the deep sea is:
a. the sun. b. bioluminescence. c. underwater volcanoes. d. dinoflagellates. e. anglerfish.
Which of the following has its primary effect on the brain's pain receptors?
A. adredocorticotropic hormone (ACTH) B. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) C. endorphins D. oxytocin E. antidiuretic hormone (ADH)