A region of a chromosome contains two strands of DNA, yet only one is used to transcribe a gene because
A. both strands are transcribed, but only one strand of DNA contains a reading frame.
B. all genes are found on the same strand of DNA in a chromosome.
C. the start of transcription is random along the chromosome and doesn't always occur on a gene.
D. RNA polymerase binds to the terminator, stopping transcription on one strand of DNA.
E. RNA polymerase binds to the promoter, which precedes the gene only on the template strand of DNA.
E. RNA polymerase binds to the promoter, which precedes the gene only on the template strand of DNA.
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Enumerating cells in a biofilm is especially challenging for
A) microscopic direct counting. B) measuring turbidity. C) viability counts with spread plating. D) microscopic direct county, measuring turbidity, and viability counts with spread plating.
Nonnative plant invaders, such as the alfalfa plant bug, are extremely invasive and hard to control because
A. they arrive in new locations where natural predators are not present. B. they tap into the xylem of a plant while seeking carbohydrates. C. they cause the plants' axillary buds to grow out. D. their populations evolve faster than the plants they attack. E. cause the plants' stomates to become unevenly distributed within the epidermis.
Pedigree analysis is necessary when studying human inheritance patterns because _____
a. humans have more than 20,000 genes b. of ethical problems with experimenting on humans c. inheritance in humans is more complicated than in other organisms d. genetic disorders occur in humans e. all of these
Which reaction represents cellular respiration?
A) Sugar + Oxygen ? Carbon dioxide+ Water + ATP B) Carbon dioxide + Water + ATP ? Sugar + Oxygen C) Oxygen + Carbon dioxide ? Sugar + Water + ATP D) Water + ATP ? Carbon dioxide + Sugar