A species that has population levels so low it
faces extinction in all or part of its range is
designated as
a. riparian.
b. endemic.
c. endangered.
d. fragmented.
e. an indicator
C
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A pied kingfisher in its first year of life helps in the feeding of three full siblings who would not have survived without the helper's efforts. What is its indirect fitness in its first year?
A) 0.25 B) 0.50 C) 0.75 D) 1.00 E) 1.50
The _______ of a morphogen determines its effect on development
A. size B. homeodomain C. color D. concentration
A 50-year-old woman visits her doctor with complaints of bruises that will not heal. Her doctor has had her on long-term antibiotic treatment to control some chronic infections
Which of the following explains how her antibiotic treatment is related to her bruising? A) The antibiotics weaken the cells lining her capillaries, causing them to leak blood into the surrounding tissues. B) The antibiotics have traveled to her liver and are now preventing the liver from producing proteins that circulate in the blood and help with clotting. C) The antibiotics have destroyed the "good" bacteria in her large intestine that produce vitamin K, which is important for proper blood clotting. D) She is malnourished because the antibiotics have destroyed the "good" bacteria in her digestive system that are responsible for producing the digestive enzymes that she needs to break down her food.
What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter. B. The transcription bubble is formed. C. Transcription factors bind to the TATA box sequence. D. The DNA double helix is unwound. E. RNA polymerase synthesizes a short primer.