Provide one example of a medical application of biotechnology
What will be an ideal response?
Possible answers are genetic screening, animal models of human diseases, therapeutic proteins (insulin and vaccines), and gene therapy.
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When you compare Australian marsupials to placental mammals today
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
A. the marsupials are all very primitive, having changed very little during the last 70 million years.
B. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches.
C. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.
D. the marsupial fossils look remarkably similar to the placental mammals of today.
E. living marsupials are little changed from the earliest marsupial fossil forms.
Smoking cigarettes causes lung cancer because
A) nicotine destroys the membranes of alveoli, the microscopic air sacs. The alveoli expand, and the person cannot completely exhale. B) nicotine is deposited as black, sticky tar in respiratory passages. C) nicotinic receptors in the lungs bind carcinogens in cigarette smoke. D) nicotine binds the A1 allele of the dopamine D(2) receptor.
The region of a plant that is composed of undifferentiated cells is called the ________
a. roots b. dermal tissue c. meristems d. cotyledon e. ground tissue
The organ of Corti is
a. a chemoreceptor. b. a mechanoreceptor. c. a photoreceptor. d. a nociceptor. e. all of these.