Answer:
b. an electrical signal that travels along the axon of a neuron.
Explanation:
An action potential is a nerve impulse or an electrical signal that travels down an axon which cause a change in polarity across the membrane of the axon.
In response to an electrical signal from another neuron, sodium ion (Na+) and potassium ion (K+) (i.e gated ion channels) open and close as the membrane reaches its threshold potential. Na+ channels open at the beginning of the action potential, and Na+ moves into the axon, causing depolarization.
Repolarization occurs when the K+ channels open and K+ moves out of the axon, causing a diferent change in polarity between the exterior of the cell and the interior of the cell. The impulse then travels down the axon in one direction only, to the axon terminal where it signals to other neurons.
Note about the question:
In the GIZMO program, you will be provided with 46 chromosomes that are not paired nor in order (box superior-right). According to the chromosome image shown below, you need to look for the correct chromosomes, pair them with their homologous, and place them in their correct spot to complete the karyotype.
Answer:
- Subject B sex: Female
- Justification: The last pair of chromosomes are equally large, meaning that they are two X chromosomes (XX).
Explanation:
<em>Note: You will find the complete karyotype in the attached files.</em>
A human cell has 46 chromosomes or 23 pairs of homologous chromosomes. 22 of them are somatic chromosomes or not-sex chromosomes. The last pair, number 23, is the only sex pair.
To know if an individual is a male or a female, you just need to see the last pair of chromosomes. Pair 23 is the sex pair.
- Male: The pair is formed of a short chromosome (which corresponds to Y from the male parent) and a large chromosome (which corresponds to X from the female parent)---> XY
- Female: The pair is formed of two equally large chromosomes. Each of them corresponds to X, one from the male parent and the other from the female parent). ----> XX
What kind of organisms existed in the past?
How did organisms move about? are some testable questions hat could be used to further investigate the topic of using the fossil record to identify changes in life on earth.
- Fossils are the remains of extinct plants and animals that have been encased in layers of rock.
- The existence of fossil records demonstrates how living things have altered or evolved over time.
- The specific order in which these species have lived has been identified by paleontologists. For instance, older rocks contained simpler species, while younger rocks contained complex life.
- Existence of species with transitional traits that are placed in sequential stratigraphic order is one pattern in the fossil record.
- This indicates that the fossil record demonstrates minute changes in the structures of creatures across time, supporting evolution.
learn more about fossil here: brainly.com/question/11224681
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Of the more that 7.4 billion people living in the world today nearly A BILLION PEOPLE suffer from malnutrition.
Malnutrition refers to lack of proper nutrition, it may be as a result of not having enough to eat or eating meals that lack necessary nutrients. Malnutrition is principally caused by poverty and a lot of people, especially from developing countries suffer from this condition. Malnutrition weakens body immunity and make the body susceptible to diseases.<span />