Fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once
The genes of a bacterial __________________ are transcribed into a single mRNA.
Many bacterial promoters contain a region known as a(n) __________________, to which a specific transcription regulator binds. Genes in which transcription is prevented are said to be __________________. The interaction of small molecules, such as tryptophan, with __________________ DNA-binding proteins, such as the tryptophan repressor, regulates bacterial genes. Genes that are being __________________ expressed are being transcribed all the time.
allosteric negatively positively
constitutively operator promoter
induced operon repressed
Fill in the blank(s) with correct word
The genes of a bacterial operon are transcribed into a single mRNA. Many bacterial promoters contain a region known as an operator, to which a specific transcription regulator binds. Genes in which transcription is prevented are said to be repressed. The interaction of small molecules, such as tryptophan, with allosteric DNA-binding proteins, such as the tryptophan repressor, regulates bacterial genes. Genes that are being constitutively expressed are being transcribed all the time.
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Individuals with variations that make them best suited to their environment will, on average, be more likely to
A. be larger B. survive and reproduce C. evolve D. change over time
A mutation in the DNA-binding domain of a steroid hormone receptor is most likely to affect what aspect of receptor function?
A. the cellular response to the hormone B. the translocation of the receptor to the nucleus C. the binding of the hormone to the receptor D. the conformational change of the receptor
Two genes within an organism that arose from the duplication of a single gene in an ancestor are ________.
Fill in the blank(s) with the appropriate word(s).
The loss of plant biodiversity, including the wild relatives of crop species, is harmful because these wild relatives
A) feed most of the world's population. B) may be suitable for domestication and regional production. C) are often tastier than existing crops. D) are a source of genetic diversity that could be used to modify or bolster existing crops.