A scientist publishes a paper that states that changes in the levels of gases in the atmosphere of a moon of Saturn indicate tha

It is correct <span>that alterations in membrane permeability or ion concentration can affect the resting membrane potential. The resting membrane potential is defined by the voltage across the membrane of a neuron at rest. This potential is influenced by the concentration gradients of ions such as Na+ and K+ and by how permeable the membrane is to these ions. In a resting neuron, there exist concentration gradients for Na+ and K+ ions across the membrane. Ions traverse their gradients through channels, which results in a charge separation that establishes the resting potential.</span>

Answer:

100 units

Explanation:

The parent cell holds 200 units of DNA. During the process of cell division, this amount is distributed between the resulting daughter cells, with each cell obtaining half of the DNA present in the original cell.

As mitosis yields two daughter cells, each one will receive 100 units of DNA.

Answer:

The respiratory system is comprised of specialized organs and structures for gas exchange in both animals and plants. The structure and function of this system differ significantly based on the organism's size, habitat, and evolutionary background. In terrestrial animals, the respiratory surfaces are typically the linings of the lungs. In mammals and reptiles, gas exchange occurs within millions of tiny air sacs known as alveoli, while birds have atria for this process. These tiny air sacs boast an extensive blood supply, ensuring air comes into close proximity with the bloodstream. They connect to the outer environment through airways or hollow tubes, with the trachea being the largest that divides in the chest into two primary bronchi. These then branch further into successively narrower secondary and tertiary bronchi, eventually leading to numerous smaller tubes called bronchioles. In birds, these are referred to as parabronchi. The air needs to be drawn into the alveoli or atria from the outside through the act of breathing, which involves respiratory muscles.

Explanation:

Answer:

Mitosis involves:

Resulting in two genetically identical

diploid nuclei

A diploid quantity of sister

chromatids align at the spindle

equator during metaphase

Meiosis I entails:

Resulting in two genetically diverse

haploid nuclei

Homologous chromosomes align

at the spindle equator during

metaphase

Homologous chromosomes pair

during prophase

Crossing-over takes place during

synapsis

Meiosis II involves:

Leading to four genetically diverse

haploid nuclei

A haploid amount of homologous

chromosomes align at the spindle

equator during metaphase

Explanation:

Mitosis is a cellular division process that generates two daughter cells identical to the parent cell. In this process, the chromosome count of the parent cell is preserved in the resulting daughter cells, meaning a diploid cell (2n) divides to form two diploid (2n) daughter cells. Sister chromatids (duplicated chromosomes) are involved at various stages of mitosis, i.e., during Metaphase, diploid sister chromatids align along the cell's equator, and during Anaphase, these sister chromatids are separated and moved to opposite poles.

On the contrary, meiosis is a type of cell division that produces daughter cells with half the chromosome number. Since the count is halved, meiosis occurs in two phases: Meiosis I and II.

Meiosis I yields two daughter cells genetically different from each other, with a reduced chromosome number (from diploid (2n) to haploid (n)). In Meiosis I, homologous chromosomes (similar but not identical chromosomes obtained from parents) pair to form a TETRAD during Prophase, allowing chromosomal segments to be exchanged between non-sister chromatids through CROSSING-OVER. This process generates genetic variability among daughter cells in comparison to the parent cell. Homologous chromosomes also align at the cell's equator during Metaphase and subsequently separate during Anaphase.

Meiosis II, on the other hand, divides the two daughter cells from meiosis I into four genetically distinct daughter cells. With the chromosome number previously reduced from diploid (2n) to haploid (n) in Meiosis I when homologous chromosomes split, haploid sister chromatids are then present and involved during the stages of meiosis II, where they align at the equatorial plane during Metaphase and ultimately separate in Anaphase.

Euglena presenta un color verde gracias al clorofila que se encuentra en los cloroplastos de este organismo, y la estructura corporal situada en su base se llama flagelo.

Explanation:

Las Euglenas son especies que habitan en aguas dulces y saladas, y se encuentran en gran cantidad en cuerpos de agua interiores, donde pueden proliferar y teñir la superficie del agua de zanjas y estanques de un color verde.

Este color verde que producen se debe en gran parte a la clorofila que se halla en sus cloroplastos, la cual es el pigmento responsable del color verde. Este pigmento también es el causante de la coloración en este caso.

Las Euglenas cuentan con una estructura corporal especializada, ubicada en la base de su cola, que les permite moverse.

Esta estructura especializada se denomina flagelo.