♥ They make use of a control group because its something that they can look into, something to compare to. <span />
Answer:
option D: GABA ( gamma-aminobutyric acid )
Explanation:
The amount of neurotransmitters released during depression can not be properly measured. The neurotransmitters released due to anxiety are GABA, serotonin, Cck, and glutamate.
The rise in level of neurotransmitter, GABA in depression causes anxiety. Thus, option D is correct.
Answer:
A general decrease in transcriptional activation
Explanation:
When acetyl groups are added to histone proteins by acetyltransferase enzymes, the 30-nm chromatin fiber will not be formed because the proteins are prevented from doing so. This further destabilizes the chromatin structure and allows the occurrence of transcription. However, raising the cells to 40°C does not allow the acetyltransferase enzyme to function and hence the acetyl group will be hindered from being added to the histone protein which is the main target of the enzymes. Thus, transcription activation will be blocked because the chromatin and nucleosomes would remain stabilized.
Answer:
C
Explanation:
A scientist who studies objects in the sky, including planets, galaxies, blackholes, and stars
Answer:
b. Infection with a hepatitis virus
Explanation:
The infection with hepatitis virus can cause sever tissue damage that leads to permanent scarring.
