A monomer is a molecule, which means that it is a group of two or more atoms, which are bound in a chemical bounds. So the correct answer is <span>a unit made of several atoms. </span>
Answer:
The structure that is independent of the endomembrane system is the chloroplast, present in the plant cell.
Explanation:
The endomembrane system consists of the continuity of the plasma membrane inside the cell, dividing it into compartments that contain membranous organelles with different functions.
The organelles that are part of the endomembrane system are:
- Cell nucleus
- Golgi apparatus.
- Endoplasmic reticulum.
- Vacuoles, lysosomes and vesicles.
The chloroplast of the plant cell is not considered a membranous organ, nor is it part of the endomembrane system. The mitochondria, in the animal cell, also does not belong to this membranous system.
Learn more:
Endomembrane system brainly.com/question/8010049
The iris is a pigmented muscular curtain found near the front of the eye and between the cornea and lens. It is perforated by an opening known as the pupil. The location of the iris is found in front of the eye lens and the ciliary body and posterior to the cornea. It is bathed in a fluid called as the aqueous humor.
The iris consists of two sheets of smooth muscles with opposing actions: dilation/expansion and contraction/constriction. The primary function of these muscles is tho control the size of the pupil and modulates how much light reaches the sensory tissue of the retina. The sphincter muscle of the iris is a rounded muscle that constricts the pupil whenever there is a bright light, whereas the dilator muscle expands the eye opening when it contracts.
Therefore, the answer is D. SMOOTH AND INVOLUNTARY because first of all the types of muscles that comprises the muscles in the iris are smooth and it is involuntary because they eyes auto-regulates the light that comes to it without our conscious effort.
The answer is A, i took the course.
