There is clear evidence that chromatin state is directly related to the ability of transcriptionally active proteins to initiate gene transcription. Compare and contrast euchromatin to heterochromatin in the context of transcription
What will be an ideal response?
Regions of active expression are identified as euchromatin or euchromatic regions. Most expressed genes or genes that are actively transcribed are located in euchromatic regions. Condensation of the DNA is variable in euchromatin throughout the cell cycle.
Regions in which chromatin is tightly condensed are identified as heterochromatin or heterochromatic regions. Heterochromatic regions contain fewer expressed genes or fewer genes that are actively transcribed compared to euchromatic regions.
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Toward the end of the Proterozoic eon, multicellular animals emerged. The first animals were
A. Fish. B. Reptiles. C. Invertebrates. D. Chordates. E. Tetrapods.
A gene on the Y chromosome that determines maleness is
A) ABO. B) XIST. C) SRY. D) E. BOY.
Which of the following characterizes blood flow through capillaries?
A) small total cross-sectional area, so blood flows rapidly B) enormous total cross-sectional area, but wide so that blood cells pass quickly C) enormous total cross-sectional area, but narrow so that blood cells pass slowly D) small total cross-sectional area, so blood flows slowly
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.Another toxin that also blocks neurotransmitter release is tetanus toxin; however, it primarily affects inhibitory interneurons of the spinal cord that negatively regulate motor neurons. Which would be symptoms of tetanus toxin poisoning?
A. Slowed action potential conduction B. Flaccid paralysis C. Pupil dilation D. Spastic paralysis