Constitutive genes are()
A: genes that
are expressed all the time.
B: genes that
are not expressed at all the time.
C: genes that
are expressed when needed.
D: genes that
are repressed.
A: genes that
are expressed all the time.
B: genes that
are not expressed at all the time.
C: genes that
are expressed when needed.
D: genes that
are repressed.
举一反三
- Housekeeping genes are() A: not found in<br/>genomes. B: not<br/>expressed in cells. C: genes that<br/>produce essential products for the survival of an organism. D: need to be<br/>induced.
- Which of the following genes cannot be expressed? () A: α B: β C: ψβ D: δ
- By definition, homologous genes are genes that: A: Share a common function. B: Share a common evolutionary ancestor. C: Are expressed under similar conditions. D: Have at least 50% nucleotide sequence identity.
- Reporter genes can be used to indicate not only the amount of gene expression, but also the sites of the expressed proteins.
- Some genes can be expressed in different ways to generate multiple gene products from a single segment of DNA.