In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption.
B. no errors will be made during transcription.
C. the nucleosome will quickly form, which assists in mRNA formation.
D. once that gene is transcribed, the mRNA is saved and used over and over again.
E. once a gene is turned off, it will remain off.
E. once a gene is turned off, it will remain off.
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For filtration to take place through the fenestrated capillaries of the renal corpuscle, _____
A) the concentration of ions must be greater in the capillaries (the glomerulus) than in the renal tubule B) there must be a greater pressure inside the glomerulus than in the renal tubules C) there must be a larger concentration of proteins in the renal tubule than in the glomerulus D) there must be more than one capillary bed in the renal corpuscle
The Calvin cycle of a plant exposed to light during the day that is suddenly put in the dark
A. cannot run, as it requires light energy directly. B. can still run as long as there is ATP, CO2, and NADPH present. C. runs in a different place in the plant. D. uses a different source of carbon.
How could parasitism by wasps and feeding by birds result in a higher percentage of galls of medium
size rather than small or large galls, or an even percentage of all sizes of galls, made by a gall-making fly?
What will be an ideal response?Densely staining regions of highly compacted chromatin that are generally not transcribed are:a
heterochromatin. b. homochromatin. c. histone-dependent chromatin. d. primary chromatin. e. heterochromatinization