Which example describes biological evolution?
A) You are vaccinated against polio and are protected against the disease.
B) A tree branch is broken off and another grows in its place.
C) Over time, a caterpillar species becomes as green as the leaves it eats.
D) The average woman's dress size has increased over the last 50 years.
C
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A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
A. mutations have a far more dramatic effect on embryos than on adult organisms B. the embryological development of many plants and animals is almost identical C. the more advanced the animal, the more slowly it develops D. embryos of dissimilar organisms, such as sharks and humans, resemble each other E. all animals develop similar embryonic gills
Why is it unlikely that genetically engineered strains of bacteria would pose a threat to the environment?
a. Genetically engineered bacteria cannot survive exposure to UV radiation. b. Genetically engineered strains of bacteria are strictly regulated, making accidental release unlikely. c. Genetically engineered strains of bacteria cannot survive exposure to oxygen. d. Genetically engineered strains of bacteria are poor competitors of wild strains. e. Genetically engineered strains of bacteria require supplemental nutrients to survive
Why has the United States and Europe banned the use of human drugs in animal feeds?
A. Because it raises the price of the meat too high. B. Because it makes the animals grow too large. C. Because it causes infections in the cows and poultry fed them. D. Because it contributes to the growing drug resistance problem. E. All of these choices are correct.
In the process of nitrogen fixation, if you start with 5 molecules of N2, you will need ________ hydrogen atoms and ________ ATP molecules to make ________ molecules of ammonia.
A. 30; 80; 10 B. 30; 80; 5 C. 15; 80; 10 D. 15; 16; 5