Answer:
The correct answer is - A. Tight DNA packing tends to promote gene expression.
Explanation:
Euchromatin which is less packed or condensed is highly expressed as it participates in the transcription whereas highly compacted chromatin - heterochromatin not expressed at all as these does undergoes the transcription process.
DNA binds around a core of 8 subunits of Histone protein in a nucleosome in which DNA is negatively charged and histone protein is positively charged protein .
DNA packing decreases its transcription and hence no expression.
The neurons responsible for connecting the
motor and the sensory neurons are
known as interneurons. They achieve this through creation of neural circuits
which facilitates communication between the motor and sensory nerves. Interneurons also assist in interpretation of
impulses especially those which are found in the brain and spinal cord tissue
Correct answer: Hippocampal
Brain imaging, structural or functional helps us to study the structure and functions of the brain and other parts of the nervous system. Post Traumatic Stress Disorder affects a network of brain areas, like hippocampus, amygdala, cingulate, and prefrontal cortex. In PTSD, the concentrations of corticotropin- releasing factors increases in the cerebrospinal fluids. This stress also leads to the change in the volume and functions of hippocampus, which has a crucial role in memory.
The four main phases of the menstrual cycle are:
<span>menstruation.
the follicular phase.
ovulation.
<span>the luteal phase.</span></span>
Answer:
Ozone (O₃) gas
Explanation:
In the Earth's stratosphere, oxygen gas (O₂) is combined with atomic oxygen (O) to form ozone gas (O₃). This is very important because ozone protects the life on Earth from ultraviolet (UV) radiation from the Sun. UV radiation is high-energy radiation, and it is very dangerous for living organisms. Ozone molecule (O₃) absorbs UV radiation and it breaks down by forming O₂ and atomic oxygen (O) again. In this way, it protects the Earth from nocive radiation.
