The coding regions of a gene are called
A) introns.
B) exons.
C) promoters.
D) enhancers.
Answer: B
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Which of the following statements about DNA replication is INCORRECT?
A. It begins at multiple origins of replication sites along eukaryotic chromosomes. B. It proceeds with the addition of new nucleotides to the 3? end of a growing DNA strand. C. It is powered by the hydrolysis of ATP. D. Each strand within the DNA double helix is used as a template for synthesis of a new strand. E. It requires that each strand in the double helix be separated from the other.
If the GC content of two organisms is 45% in both,
A. they are definitely related. B. they are definitely not related. C. they may or may not be related. D. the AT content is 65%. E. they are definitely related AND the AT content is 65%.
Which type of microscopy passes light directly through a stained and killed specimen?
a. confocal laser scanning microscopy b. phase-contrast microscopy c. bright field microscopy d. scanning electron microscopy e. fluorescence microscopy
A typical eukaryotic cell that has an abundant supply of glucose and O2 will generate a proton gradient in its
mitochondria by ____ that is used primarily for ____.
a. chemiosmosis; substrate-level phosphorylation b. the electron transport chain; chemiosmosis c. the electron transport chain; substrate-level phosphorylation d. fermentation; NAD reduction e. glycolysis; production of CO2