Gene silencing refers to:
A. repression of gene expression by the absence of activator proteins.
B. repression of gene expression by the presence of repressor proteins.
C. the absence of gene expression due to its location in the genome.
D. All of the choices are correct.
C
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Rarely, a chromosome’s structure becomes altered
when part of it undergoes __________, __________, __________, or __________. Fill in the blank(s) with the appropriate word(s).
All of the following cell types are correctly matched with their functions except
a. mesophyll-photosynthesis. b. guard cell-regulation of transpiration. c. sieve-tube member-translocation. d. vessel element-water transport. e. companion cell-formation of secondary xylem and phloem.
At an autosomal gene locus in humans, the allele for brown eyes is dominant over the allele for blue eyes. At another gene locus, located on the X chromosome, a recessive allele produces colorblindness while the dominant allele produces normal color vision. A heterozygous brown-eyed woman who is a carrier of colorblindness has children with a blue-eyed man who is not colorblind. What is the probability that their first child will be a blue-eyed female who has normal color vision? (Enter the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5)
Fill in the blank(s) with the appropriate word(s).
Which of these metals have antimicrobial properties associated with them?
A. Tin B. Gold C. Silver D. Aluminum E. both silver and gold