Answer:
I wont be able to answer all of them but: 1. C
2. Compound
Explanation:
A positive charge is called a proton, no charge is a neutron and a negative charge is a electron
When atoms are combined they are called a compound.
Hopes this helps you a bit.
Answer:
Brain is the main coordination center of the body and regulates the proper functioning of the body. Brain is divided into three parts- forebrain, midbrain and hindbrain.
Cerebrum: Crerebrum is the largest part of brain and controls the language, communication ability, and the process of learning and memory of an organism.
Hypothalamus: Hypothalamus is located at the base of a brain. Hypothalamus releases various hormones, regulates the body temperature and manages the sexual behavior of an organism.
Thalamus: Thalamus is located above the brain stem and relay the neurons into the cerebral cortex. Thalamus regulates alertness, wakefulness and sleep of an organism.
Spindle fibers play a vital role in ensuring the proper distribution of chromosomes to daughter cells during cell division, specifically in the process of mitosis and meiosis. These fibers are part of the cellular structure known as the mitotic spindle, which is responsible for separating the duplicated chromosomes and ensuring their accurate allocation to each daughter cell.
The formation of spindle fibers begins during the early stages of cell division when the centrosomes, also known as microtubule organizing centers, duplicate and migrate to opposite poles of the cell. As the cell progresses through mitosis or meiosis, the spindle fibers extend outward from the centrosomes and attach to the chromosomes.
The spindle fibers consist primarily of microtubules, which are dynamic protein polymers. There are two types of spindle fibers: kinetochore fibers and polar fibers. Kinetochore fibers originate from the centrosomes and connect to the specialized protein structures called kinetochores that assemble at the centromere region of each duplicated chromosome. These fibers exert tension on the chromosomes, aligning them at the cell's equatorial plane during metaphase.
During anaphase, the kinetochore fibers begin to shorten, pulling the sister chromatids apart. The shortening of the kinetochore fibers is powered by the depolymerization of microtubules at their kinetochore ends. As a result, each chromatid is directed towards the opposite poles of the cell.
Simultaneously, polar fibers, also known as interpolar microtubules, extend from one pole of the cell to the other. These fibers overlap in the cell's center and assist in separating the poles further apart, helping to elongate the cell during anaphase.
Overall, the combined action of kinetochore fibers and polar fibers ensures the accurate distribution of chromosomes to the daughter cells. The spindle fibers undergo a highly orchestrated process of assembly, attachment, tension generation, and depolymerization, all of which contribute to the successful partitioning of the genetic material during cell division.
zone of maturation
root meristem
zone of cell division
Newly formed root cells start to differentiate into various cell types in the zone of maturation. Here, cells adopt specialized functions like root hair cells, transport cells, or storage cells after the stages of root meristem and elongation.
Newly formed root cells begin to form different cell types in the zone of maturation. The root system in plants involves different zones. Directly behind the root tip is the root meristem, which is the site of active cell division. Beyond the root meristem is the zone of elongation, where cells begin to elongate. However, it is in the zone of maturation, or differentiation, where cells adopt specialized functions such as root hair cells, storage cells, or transport cells.
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Newly formed root cells begin to differentiate into different cell types in the zone of maturation. This is the final stage where elongated cells from the zone of elongation mature into specialized cells.
Newly formed root cells begin to differentiate into different cell types in the zone of maturation. In the root development process, there are different zones responsible for different tasks. The process starts at the root meristem, where cells are actively dividing. Next, these young cells move into the zone of elongation, where they begin to lengthen. Lastly, these elongated cells enter the zone of maturation. In this zone, they further differentiate into specialized cells, responsible for absorption of water and minerals, a function integral to the plant's survival.
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Answer:
chloroplasts
Explanation:
Among the listed organelles, chloroplasts cannot be found in an animal cell. Instead, chloroplasts are present in plant cells and certain algae, playing a key role in the process of photosynthesis. The other organelles - ribosomes, lysosomes, and vacuoles - are all present in animal cells.
Among the options listed - chloroplast, ribosome, lysosome, and vacuole - the one that cannot be found in an animal cell is the chloroplast. Chloroplasts are organelles present in plant cells and certain algae. They play a critical role in a process called photosynthesis, during which sunlight, water, and carbon dioxide are converted into oxygen and glucose. However, animal cells do not have chloroplasts because they do not perform photosynthesis. Instead, they obtain energy via different processes such as cellular respiration, which happens in mitochondria. On the other hand, ribosomes, lysosomes, and vacuoles are indeed present in animal cells. Ribosomes are involved in the synthesis of proteins, lysosomes handle waste disposal and cellular digestion, and vacuoles are involved in storing substances and maintaining turgor pressure within the cell.
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Answer:
sample response: Endotherms are able to maintain a constant body temperature. An endotherm may respond to a hot summer day by sweating or panting. The body temperature of an ectotherm, on the other hand, changes with its surroundings. In order to stay cool, an ectotherm must move somewhere cooler like the shade of a plant or rock or seek cool water to lay in
Explanation: