Use of genetically modified crop plants may be crucial to feeding the world's growing population. Discuss this statement with regard to Bt toxin production in modified crop plants.
What will be an ideal response?
Crop plants producing Bt toxin require the applying of far less chemical pesticide than unmodified crops. This in turn reduces the cost of producing the crop, reduces the possibility of pesticide contamination of the food, and reduces contamination of the environment with pesticides. Killing the insects feeding on the plant reduces crop damage and increases the crop yield, making the crop more economical to produce. Further, only the insects actually eating the crop plants are affected by the Bt toxin.
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Collagen is a tough, stretch-resistant protein. You would be most likely to find collagen in which type of tissue?
A. nervous B. muscular C. epithelial D. connective E. epithelial and connective tissue
Carbon-14 dating is best used for determining ages of ________
a. metamorphic rock samples 2 to 3 billion years old b. carbon-containing samples less than 100 years old c. igneous rock samples 3 to 4 billion years old d. carbon-containing samples less than 60,000 years old
In their action, muscles would be most like
a. ropes. b. levers. c. push rods. d. screws. e. hammers.
The condition ____________________ can occur when an Rh- woman becomes pregnant by an Rh+ man. Fill in the blank(s) with the appropriate word(s)