Answer:
Argon
Explanation:
The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table. destinymitchell966
At least 12 million years ago?
This is because the melanocytes are located in the stratum basale. Lighter-skinned people usually have low basal levels, and exposure to UV radiation causes an increase which makes skin darker.
Answer:
it is located 1000 nucleotides upstream of the gene’s core promoter - true
it is located 1000 nucleotides downstream of the gene’s core promoter- true
it is in the gene’s coding region - False
Explanation:
These enhancers are located 50 or more kilobases from the promoter they controlled upstream from a promoter, downstream from a promoter within an intron, or even downstream from the <u>final exon</u> of a gene which can be thousands of bp away from the gene's core promoter and can also occur thousands of nucleotides away from the gene's core promoter needing the activity of a DNA -bending protein that binds to the enhancer changing the shape of the DNA and allow interactions between the activators and transcription factors.
Answer:
Nitrogen is an important nutrient for all plant cells, and it is component of the chlorophyll found in leaves. Which of the following statements best describes how nitrogen is absorbed and distributed to the leaves of the plant so that photosynthesis can take place?
Nitrogen is absorbed by the roots and distributed upwards through the xylem
Explanation:
Nitrogen are gotten from the ground by the plants before it is transported through xylem to the stem and then the leaves
