Hormones act only on their target cells because of the mechanism of receptor specificity, where the hormones and cells interact like keys and locks.
The mechanism that ensures a hormone acts only on its target cells is based on the concept of receptor specificity. In biology, hormones are like keys, and the cells they affect are like locks; each hormone (key) fits only a specific type of receptor on certain cells (locks). If a cell does not have the appropriate receptor for a particular hormone, then it will not be affected by that hormone. This is why a hormone can travel throughout the body, yet only exert its effects on certain cells.
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A. x = 4, y = 5
B. x = –4, y = 0
C. x = 4, y = –5
D. x = 0, y = 5
x = 4, y = -5
This is a problem with complex numbers.
A complex number is a number of the form where x and y are both real numbers.
For example,
Let's look at the key problem.
We must identify the values of x and y that would make the following expression represent a real number.
At this point, 4yi and 5xi must be of equal value and marked opposite, so that the expression represents real numbers.
Become a fraction, i.e.,
From the options, the answer is C.
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Let's check back to expression.
x = 4 dan y = - 5 ⇒
Thus the expression represent a real number of 41.
Keywords: identify, the values of x and y, the following expression, represent a real number, (4 + 5i)(x + yi), a complex number, real, imaginary
Answer: A
Explanation:
Answer:
True
Explanation:
Koch's postulates was proposed to show a causative relationship between a microbe and a disease.
Koch's postulates
•The microorganism must be present in large quantity in all organisms affected by the disease, but should not be seen in healthy organisms.
Koch abandoned this due to his discovery of asymptomatic carriers of cholera and of typhoid fever. Asymptomatic or subclinical infection carriers are seen in diseases, especially viral diseases.
•The microorganism must be seperated from a diseased organism and nutured in pure culture.
This can suspended for specific microorganisms or entities which(at the current time) can't be nutured in pure culture. Viruses uses host cells to grow and replicates and not in pure culture.
•The cultured microorganism should lead to disease when it infects a healthy organism.
It says "should", not "must".
NOTE: NOT ALL organisms introduced to an infectious agent will be infected which may be due to certain factors like general health and good immune functioning; vaccination; or genetic immunity. Its best explained using the resistance to malaria as a result of presence of at least one sickle cell allele.
•The microorganism must be reisolated from the inoculated, diseased experimental host and observed as being identical to the basic specific causative agent.
A single pathogen may lead to several disease conditions. A singualr disease infection may be due to several different microorganisms. While some pathogens cannot be cultured in a pure culture in the lab, others can infects humans.
Answer:
The prefrontal cortex
Explanation:
The prefrontal cortex, which is responsible for higher-order cognitive functions such as decision-making, planning, impulse control, and reasoning, is generally the slowest area of the brain to develop. Its development continues into early adulthood, with significant changes occurring throughout adolescence. This delayed development of the prefrontal cortex is often associated with the development of executive functions and the ability to make complex decisions, which is why teenagers and young adults may sometimes exhibit impulsive behavior or have difficulty with long-term planning.
0 2
1 6
2 18
Write an exponential function to represent the spread of Ben's social media post.
Answer:
Explanation:
The general exponential function is written as :-
,where y is the amount of the material after t years , A is the initial amount and b is the multiplicative rate of growth.
From the given table, the number of shares on day 0 = 2 .
Thus the initial number of shares = 2
The growth factor is given by the ratio of the consecutive terms :-
Now, put A = 2 and b = 3 in (i), we get
∴ The exponential function to represent the spread of Ben's social media post is