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pychu [463]
3 years ago
8

Choose the true statement.

Biology
1 answer:
Ad libitum [116K]3 years ago
5 0

Answer: The true statement is: Autocrine signals are produced by and act upon the same cell

Explanation:

Autocrine signals are made by cells producing hormones or molecules that acts on the same cell that produces it.

Usually, these autocrine hormones bind to receptors positioned in the cells producing them and thereby signal/exert changes in the cell.

Other options contains false statements

- Steroid hormones are produced ONLY when needed, not produced in advance and then stored

- Neurohormones do not help in the transmission of nerve impulses; So, they ARE NOT neurotransmitters

- Paracrine signals exert their effects on nearby cells; thus, they are not for long distance communication.

The ONLY true statement is that 'Autocrine signals are produced by and act upon the same cell.'

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A patient is receiving gentamicin once daily. A nursing student asks the nurse how the drug can be effective if given only once
Digiron [165]

Answer:

a."Gentamicin has a longer half-life than other aminoglycosides."

Explanation:

Gentamicin is an aminoglycoside that binds to bacterial ribosomal proteins and causes the inhibition of the protein synthesis, killing the bacteria. The killing can continue for long periods after administrating the drug and even once that the concentrations of this one can no longer be detected in the plasma. That is the reason why this drug is given once a day.

5 0
3 years ago
About lymph transport.
Alex Ar [27]

The correct answer is: D) Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles.

The lymphatic system is an open system which primarily consists of lymphatic vessels, (similar to the circulatory system's veins and capillaries) interrupted by lymph nodes, where the lymph is filtered. Since there is no central pump in lymphatic system (like heart in circulatory system) lymph transport, is slow and sporadic. Lymph movement occurs due to:

• peristalsis (contraction and relaxation of smooth muscle tissue),  

• valves,  

• contraction of adjacent skeletal muscle and  

• arterial pulsation.

7 0
4 years ago
HELP HELP HELP PLZ!
Mekhanik [1.2K]

Hi,

Let us get an introduction of the problem first, Incomplete dominance is a pattern of inheritance in which, offspring from the cross of two parents shows a phenotype that is not like either parent but in between both.

For example: Let us take the example of Oompah's hair that can be either red or purple or blue. As described in the question, Red is dominant so let us denote allele for Red hair with R. The other hair color is blue that is recessive, let us denote its allele with r. Now, there is another intermediate phenotype that is purple, let us denote it with Rr because it is derived through a combination of R and r.

Now, here is the key for all possible genotypes and phenotypes of Oompahs. There are only three possible genotypes and phenotypes for the hair color.

Genotype: Phenotype

RR             : Red hair

Rr              : purple hair

rr                : Blue hair

This is because no allele can fully express itself over the other. So is we cross a red hair Oompah with Blue hair Oompah, let us see what will happen:

                                                  RR x rr

Gametes:                              r        and        R

                                       rr:     Rr :     Rr     :  RR

It means that 25 % of the offspring will have red hair, 50% will have contain purple hair and 25 % will have blue hair.

RR:              Red hair      25%

Rr:               Purple hair   50 %

rr:                 Blue hair     25%

Hope it helps!

8 0
4 years ago
What does it mean for a living thing to convert energy?
QveST [7]

Since living organisms require energy and both survival and reproduction... the sun provides the energy for photosynthesis. Cells need sugar as a sources of energy. The cellular respiration is the synthesis of ATP using energy that is being released by the breakdown of sugar to carbon dioxide and water.

3 0
3 years ago
Define <br> Bilateral<br> Hypoventilation<br> Hemothorax<br> Arrhythmias
levacccp [35]

Answer:

Explanation:

Bilateral symmetry is a type of body symmetry where the body is divided in to halves i.e refers to organisms that have body shapes which look like mirror images along the midline which is called the sagittal plane.

Hypoventilation is a process where little amount of air enter into the alveoli which result in a decrease in the amount of oxygen in the lungs and increase in carbondioxide produced by the lungs. It is caused by too shallow breathing or slow breathing.

Hemothorax is a condition where there is blood build up in the pleural space or chest wall and lungs.

Arrhythmias is a health condition where there is irregular heartbeat. That is the heart may beat to fast, too slow, or irregular heart rhythm.

5 0
3 years ago
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