Stress response elements (SREs) are _______ in certain plant genes that bind ________ and ________.
A: regulatory sequences; DNA methylases; enable epigenetic changes to the DNA at CpG islands.
B: regulatory sequences; specific transcription factors; enable coordinated regulation of the expression of several genes.
C: proteins; DNA; act like general transcription factors.
D: silencers; repressor proteins; inactivate gene transcription .
E: DNA sequences; inducers; cause inactivation of repressors.
Answer: B: regulatory sequences; specific transcription factors; enable coordinated regulation of the expression of several genes.
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The term_____ case is used to refer to the first patient found in an epidemiological investigation, although this individual may not be the first case of the infection in the outbreak
Fill in the blank(s) with the appropriate word(s).
Muscle contraction is triggered
A. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites. B. by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide. C. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites. D. when high levels of oxygen and sugar are released by the sarcolemma. E. when a surplus of ATP is released by a nerve motor unit.
A(n) ________ mycelium is a branching network of filaments that rises above the agar growth medium.
Fill in the blank(s) with the appropriate word(s).
A northern blot differs from a Southern blot in the
A) type of probe used. B) presence or absence of a nitrocellulose membrane. C) size of the genetic sequences involved. D) number of genetic sequences detected. E) type of nucleic acid being isolated.