Answer:
D. all of these answers are correct
Explanation:
Actin binding proteins are responsible for the regulation of cytoskeletal microfilaments.
Actin binding proteins have the function to
1. Maintain the population of actin monomers,
2. regulate the polymerization of filaments
3. bind to and block the growing ends of actin filaments
4. assembly actin
5. bind to the sides of actin filaments
7. cross-link actin filaments
Answer:
The best explanation if we observe an epithelial cell with chromosomes are visible and two cell nuclei is that the cell has just gone through telophase but not cytokinesis (option b).
Explanation:
A somatic cell, when found in mitosis, exhibits the chromosomes distributed in both poles and the outline of two nuclei in the telophase phase, just before cytokinesis.
In mitotic telophase:
- Chromatids, which are chromosomes, are found in the cell poles.
- It initiates the formation of the nucleus membrane.
- The chromosomes begin to turn into chromatin.
- Disappearance of the mitotic spindle, duplication of organelles and cytoplasmic invagination.
The division and differentiation of the nuclei in telophase is called karyokinesis. Later, cytokinesis occurs, where the daughter cells are separated.
The other options are not correct because:
<em> a and d. In the other phases described, </em><em><u>S and G1,</u></em><em> no chromosome distribution is observed at the poles.</em>
<em> c. A somatic cell does not experience </em><em><u>meiosis</u></em><em>.</em>
Jaundice is a condition that causes the skin of a newborn baby to turn yellow. This happens so because babies are born with extra red blood cells. After birth, the extra red blood cells break down and release a substance called bilirubin in the baby's blood. When there is too much bilirubin in the blood, the baby becomes jaundiced. <span>This condition may last for </span>3-12 weeks<span> after birth, but as long as bilirubin levels are monitored and the baby is feeding well, it rarely leads to any serious complications.</span>
Answer:
Feathers initially evolved in a role associated with sexual selection.
Explanation:
In species where only males had feathers, these feathers can be considered to have evolved into a role associated with sexual selection. This is because in these species, males used their feathers as a sexual attraction for females, in this case, females chose the males that had more attractive feathers to mate and generate new individuals for the species. An example of this can be seen in the peacock, where the tail with lush feathers is only present in males and is intended to sexually attract females.
