Agricultural chemicals, such as DDT, are so damaging to predator populations because
A. DDT is targeted at the top predators.
B. top predators consume many plants.
C. all food items are killed by DDT, and the predators starve.
D. of biological magnification.
Answer: D
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Which of the following is NOT a desirable characteristic of a model organism used to study development?
A. short generation time B. small size C. large oocytes D. produces many offspring E. large genome
A daughter can inherit an X-linked recessive disorder if
A) her mother is a carrier and her father has the disorder. B) her mother is affected with the disorder. C) her father is hemizygous for the disorder and her mother is wild type. D) her father is a carrier of the disorder.
Bacteriophage T4 blocks transcription of host genes using an enzyme that transfers an ________ from NAD onto the alpha subunit of RNA polymerase.
What will be an ideal response?
Spreading black necrosis, swelling, pain and froth or bubbles are characteristic of
A) anthrax. B) gas gangrene. C) necrotizing fasciitis. D) chromoblastomycosis. E) Pseudomonas infection.