( ) will travel through the bloodstream to act on distant target cells.
A. Neurotransmitter
B. Paracrine
C. Autocrine signal
D. Cytokines
E. endocrine signal
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( ) is the main manner for cell communication.
A. light
B. gap junction
C. heat
D. chemical messenger
E. surface protein
Prokaryotic chromosome genome ( )
A. Linear double stranded DNA molecule
B. Circular double-stranded DNA molecule
C. Linear single stranded DNA molecule
D. Linear single-stranded RNA molecules
E. Circular single stranded DNA molecule
which of following do not belong to pathogenic variations of the endogenous genes ( )
A. gene amplification
B. abnormal gene expression
C. invasion of the foreign genes
D. gene arrangement
E. point mutation
The following statements about structural genes in eukaryotes are incorrect ( )
A. Structural genes are mostly broken genes
B. Transcription of structural genes is discontinuous
Contains a large number of repeated sequences
D. Structural genes make up a small proportion of the genome
E. The products are mostly mono-cistron RNA
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