Biology/ Chemistry/ Physics ect
The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the CO2 to escape and fresh air to get in.
Please mark brainliest :)
Answer:
B. positive
Explanation:
Histones are proteins that bind to the DNA in order to form highly compacted structures named nucleosomes, the basic structural units of DNA packaging in eukaryotic genomes. A nucleosome is a segment of DNA wound around an octamer (8) of histones, i.e., two copies each of the histones H2A, H2B, H3, and H4. These histones are positively charged in order to interact with the negatively charged DNA molecule. During transcription, reducing histone positive charge decreases the interaction between DNA and histones in the nucleosomes, thereby opening the chromatin to favor the access of the transcriptional complex and thus facilitates gene expression.
Answer:
The correct answer is - phytic acid.
Explanation:
Phytic acid is a small molecule that available in various food such as seeds, beans, grains, and nuts that chelates specific minerals like iron, zinc, magnesium, and calcium.
High level of phytic acid in individual animals or humans like middle eastern populations even though they had a high amount of zinc in their diet. The high level of the phytic acid decreases the bioavailability of the nutrients and minerals.
Thus, the correct answer is - phytic acid.
Answer:
A is an enzyme,B is substrate, and yes, protein
Explanation:
