In nematodes, circular muscle is absent. Nematodes possess only longitudinal muscle, which allows for their characteristic thrashing movement. This adaptation is part of their unique body structure, enabling them to navigate through their environments effectively.
The stomach is characterized by a thicker mucosal layer with gastric pits and glands that secrete acid and enzymes, while the intestine has a thinner mucosa with villi and microvilli for increased surface area and absorption. The stomach contains parietal cells and chief cells, whereas the intestine has absorptive enterocytes and goblet cells for mucus secretion. Additionally, the stomach has a distinct muscularis layer with three muscle layers (oblique, circular, and longitudinal), while the intestine has two muscle layers (circular and longitudinal). Lastly, the presence of Peyer's patches in the ileum of the intestine is another distinguishing feature absent in the stomach.
One key genetic difference is the presence of a nucleus in human cells, which bacteria lack. Human cells have linear chromosomes enclosed within the nucleus, while bacteria have a single circular chromosome located in the cytoplasm. Additionally, bacteria may have plasmids, small circular DNA molecules that are often absent in human cells.
Absent means not in attendance. You can be absent from school, be absent minded or absent in physical presence for example.
The past tense of 'is absent' is 'was absent'. e.g. "Tim was absent that day."
62.5% of the class was absent if five eighths of the class is absent.
absent
What is the noun of absent?
Apologies: someone who can't make the meeting and informs the host prior to the meeting. Absent: someone who doesn't attend the meeting and did not let the host know.
Absent
verb
The prefix for absent is "ab-".
Absence is the abstract noun for absent.