Which of the following statements about the structure or composition of DNA is FALSE?
A. DNA is a double helix.
B. Complementary base-pairing occurs between pyrimidine and purine bases.
C. The amount of thymine closely approximates that of guanine within a particular organism.
D. Each nucleotide within a DNA is separated by about 0.34 angstroms.
E. Adenine pairs with thymine and guanine with cytosine.
C. The amount of thymine closely approximates that of guanine within a particular organism.
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Imagine that a young girl suffers a horseback-riding injury, and one of her ribs punctures her diaphragm. How will this injury affect the girl's breathing? Select all correct choices
A. The injury will make it easier to increase negative air pressure in her chest cavity, making inhalation easier. B. The injury will make it more difficult to increase negative air pressure in her chest cavity, making inhalation more difficult. C. The injury will make it more difficult to decrease negative air pressure in her chest cavity, making inhalation more difficult. D. The injury will not affect her at all, as intercostal muscles are responsible for breathing
You are interested in reducing the overall ecological impact of your college/university. Which of the following would immediately contribute to your goal? (Choose all correct answers.)
A. lower enrollment and a reduced college workforce B. decreased energy use in buildings C. installation of solar energy in some buildings
Which organism would be least likely to be able to survive rapid global climate change?
A. A self-compatible plant species (can use its own pollen to produce viable seeds) with wind-dispersed seeds and a fast growth rate B. An omnivorous, endothermic animal species with a short generation time C. An insect species that lays its eggs and feeds upon a single plant species with a short flowering period D. A crustacean that tolerates a wide range of temperatures and can reproduce sexually or asexually
The structure that people typically refer to as a "mushroom" is technically called the ____
a. Basidiocarp b. Mycelium c. Ascocarp d. hyphal mass e. Zygospore