Supercoiling is important for DNA structure, because
A) it holds together the antiparallel strands of DNA in the double helix.
B) it provides energy for transcription.
C) it condenses the DNA so that it can fit inside the cell.
D) it prevents RNA from pairing with DNA in the double helix.
Answer: C
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What are ecological reservoirs?
A. Nonliving components of ecosystems that require a constant input of chemicals B. Nonliving components of ecosystems where chemicals accumulate C. Living components of ecosystems that accumulate chemicals D. Living components of ecosystems that cycle chemicals
Darwin's finches, collected from the Galápagos Islands, illustrate which of the following?
A) mutation frequency B) ancestors from different regions C) adaptive radiation D) vestigial anatomical structures E) the accuracy of the fossil record
A hectare of wheat fixes 32,000 kg of carbon per year through photosynthesis and uses 7,000 kg of carbon per year for cellular respiration. The net primary productivity of the wheat field is therefore ________ kg of carbon/hectare/year.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a parasitic worm that lives in the human rectum and moves out to the anus to lay eggs resulting in severe itching?
a) pinworms b) flukes c) Trichinella spiralis d) filarial worms e) tapeworms