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【单选题】Which of the following statements best supports the claim that organisms share fundamental processes as a result of evolution?
A.
All organisms that are introduced into new environments have the capacity to fill vacant ecological roles.
B.
All organisms have the ability to utilize oxygen to harness energy from the chemical breakdown of organic compounds.
C.
All organisms share a genetic code organized into triplet codons, making it possible for one organism to express a gene from another organism.
D.
All organisms possess structures such as chloroplasts and mitochondria within their cells that reflect past symbiotic relationships between prokaryotic precursors.
【多选题】Commonly used reporter genes that induce visually identifiable characteristics usually involve fluorescent and luminescent proteins, including:
A.
the gene that encodes jellyfish green fluorescent protein (GFP), which causes cells that express it to glow green under blue light
B.
the enzyme luciferase, which catalyzes a reaction with luciferin to produce light
C.
the red fluorescent protein from the gene dsRed
D.
the
E.
coli lacZ gene, which encodes the protein β -galactosidase. This enzyme causes bacteria expressing the gene to appear blue when grown on a medium that contains the substrate analog X-gal
【单选题】某文件的权限是 -rwxr--r-- ,则下面描述正确的是
A.
文件的权限值是 755
B.
文件的所有者对文件只有读权限
C.
其他用户对文件只有读权限
D.
同组用户对文件只有写权限
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