Which of the following is generally NOT considered an ethical issue regarding recombinant DNA technology?
A) the modification of crop plants
B) screening of humans for genes that predispose them to disease
C) unforeseen impact on the environment
D) the modification of animals to produce pharmaceuticals for humans
E) answering basic research questions
E
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Bands of connective tissue that help muscles attach to bones are termed ________
A) ligaments B) cartilage C) tendons D) fibrocartilage
Humans rely on fossil fuels for much of our energy needs. The burning of fossil fuels adds carbon dioxide (CO2) to the carbon dioxide already in the atmosphere. How do plants help keep some of this extra carbon dioxide from accumulating in the atmosphere?
A) Plants store carbon dioxide in their tissues. B) Plants return carbon dioxide to the ground through their roots. C) Plants take in atmospheric carbon dioxide to produce food. D) Plants break down carbon dioxide into carbon and oxygen.
According to the modern classification scheme, which animal would be a spider's closest relative?
A. A snail B. A tapeworm C. An earthworm D. A squid E. A roundworm
Which of these becomes the baby?
A) inner cell mass B) trophoblast C) placenta D) outer cell mass