What Is Resistance In Biology


What Is Resistance In Biology?

The natural or genetic ability of an organism to avoid or repel attack by biotic agents (pathogens pests parasites etc.) or to withstand the effects of abiotic agents (chemicals pesticides salt wind heavy metals etc).

What is an example of resistance?

Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

What is electrical resistance in biology?

a. the tendency of a conductor to oppose the flow of current causing electrical energy to be changed into heat. Symbol: R.

What is meant by a resistant strain?

The existence of resistant strains of bacteria means that antibiotics or drugs? designed to kill them no longer work allowing them to spread rapidly posing a risk to public health. When this happens it is necessary for scientists to develop new antibiotics that the bacteria do not have resistance to.

What does the word resistance mean in the paragraph?

1 : an act or instance of opposing. 2 : the ability to withstand the force or effect of resistance to disease. 3 : an opposing or slowing force The car’s sleek design reduces wind resistance. 4 : the opposition offered by a substance to the passage through it of an electric current.

How do you explain resistance to a child?

Resistance – Resistance measures how well a material or object conducts electricity. Low resistance means the object conducts electricity well high resistance means the object does not conduct electricity well.

What is the resistance of a human body?

The resistance of the human body is around 1000 ohms.

How does resistance occur in biology?

Bacteria develop resistance mechanisms by using instructions provided by their DNA. Often resistance genes are found within plasmids small pieces of DNA that carry genetic instructions from one germ to another. This means that some bacteria can share their DNA and make other germs become resistant.

What is the resistance of a cell?

Therefore r = (3.0 – 2.8)/0.37 = 0.54 Ohm. A freshly prepared cell has low internal resistance and this increases with ageing. Thus it causes a voltage drop when current flows through it. It is the resistance provided by the electrolyte and electrodes which is present in a cell.

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What does resistant mean in microbiology?

Bacterial resistance is the capacity of bacteria to withstand the effects of antibiotics or biocides that are intended to kill or control them.

What does non resistant mean in biology?

: not resistant specifically : susceptible to the effects of a deleterious agent (such as an insecticide a pathogen or an extreme environmental condition)

What bacteria is penicillin resistant?

Some bacteria have developed resistance to antibiotics that were once commonly used to treat them. For example Staphylococcus aureus (‘golden staph’ or MRSA) and Neisseria gonorrhoeae (the cause of gonorrhoea) are now almost always resistant to benzyl penicillin.

Why do antibiotics become resistant?

How do bacteria become resistant to antibiotics? Antibiotic resistance occurs when bacteria change in some way that reduces or eliminates the effectiveness of drugs chemicals or other agents designed to cure or prevent infections. The bacteria survive and continue to multiply causing more harm.

What is resistance in medical term?

Resistance: Opposition to something or the ability to withstand something. For example some forms of the staphylococcus bacterium are resistant to treatment with antibiotics.

What does resistance mean in chemistry?

Chemical resistance is the strength of a material to protect against chemical attack or solvent reaction. It is the opposite of chemical reactivity. … A chemical resistance chart may be used to see the relative resistance of materials.

What makes an organism resistant to a chemical?

An organism may be resistant to a chemical when it contains a gene that allows it to break the chemical down into harmless substances. … The survivors happen to have a gene that protects them from the pesticide. The surviving insects pass on the gene to their offspring.

What are resistors in simple terms?

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor. … Another type of resistor is made from winding Nichrome or similar wire on an insulating form.

What is a fact about resistance?

Facts about Electrical Resistors

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Resistors limit the flow of current through a circuit. The value of a resistor is measured in Ohm’s named after the German scientists Georg Simon Ohm. Ohm’s Law states that for an ideal resistor the resistance in a circuit is equal to the voltage divided by the current or I = V x R.

How do you find the resistance?

If you know the total current and the voltage across the whole circuit you can find the total resistance using Ohm’s Law: R = V / I. For example a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.

What is the skin resistance?

the opposition of the skin to the passage of an electric current. Sometimes used in research as a physiological marker of arousal and more controversially in polygraph examinations as a manifestation of deception and various emotional states skin resistance is the reciprocal of skin conductance. …

Which part of the human body has the highest resistance?

The skin

Which part of the human body offers the most electrical resistance? The skin offers the most electrical resistance.

What is the order of resistance of human body?

What is the order of magnitude of electric resistance of the human body (dry)? Notes: Human body has different resistances when dry resistance is 100 000 ohms. When wet because of sweat or water resistance is only 1 000 ohms.

What is an example of bacterial resistance?

Examples of bacteria that are resistant to antibiotics include methicillin-resistant Staphylococcus aureus (MRSA) penicillin-resistant Enterococcus and multidrug-resistant Mycobacterium tuberculosis (MDR-TB) which is resistant to two tuberculosis drugs isoniazid and rifampicin.

What genes cause antibiotic resistance?

The spread of mobile genetic elements such as plasmids transposons and integrons has greatly contributed to the rapid dissemination of antimicrobial resistance among several bacterial genera of human and veterinary importance.

Which infections has become resistant to antibiotics and why?

Antibiotic resistance occurs naturally but misuse of antibiotics in humans and animals is accelerating the process. A growing number of infections – such as pneumonia tuberculosis gonorrhoea and salmonellosis – are becoming harder to treat as the antibiotics used to treat them become less effective.

What is EMF and internal resistance?

electromotive force (emf): the potential difference of a source of electricity when no current is flowing measured in volts internal resistance: the amount of resistance within the voltage source potential difference: the difference in electric potential between two points in an electric circuit measured in volts …

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What do you mean by internal resistance?

Internal Resistance is the resistance which is present within the battery that resists the current flow when connected to a circuit. Thus it causes a voltage drop when current flows through it. It is the resistance provided by the electrolyte and electrodes which is present in a cell.

What is cells EMF and internal resistance?

Cells EMF Internal Resistance are the components which complete the circuit and help the flow of electricity within the circuit. Cells emf and internal resistance are inter-related to one another. Batteries i.e. Cells are posses internal resistance and potential difference i.e. voltage.

What is meant by resistance to antibiotics?

Antibiotic resistance happens when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them. That means the germs are not killed and continue to grow. Infections caused by antibiotic-resistant germs are difficult and sometimes impossible to treat.

What is non susceptible?

Non-susceptible isolate: An isolate that is either resistant or not completely susceptible to one or more antibiotics. Organism: any living thing including humans animals plants and microbes. Panel: A set of antibiotics used to determine if an isolate is resistant to antibiotics and if so which ones.

What does resistant mean in urine culture?

Resistant means the bacteria can grow even if the drug is present. This is a sign of an ineffective antibiotic. Intermediate means a higher dose of the antibiotic is needed to prevent growth.

What does not resistance mean?

not able conditioned or constructed to withstand the effect of something as a disease a specific change in temperature or harsh treatment susceptible to damage or ill effects. not resistant passively obedient.

What does environmental resistance mean?

Definition of environmental resistance

: the sum of the environmental factors (such as drought mineral deficiencies and competition) that tend to restrict the biotic potential of an organism or kind of organism and impose a limit on numerical increase.

What is a non resistant material?

Unit introduction. This unit is about developing learners’ understanding of the properties of selected non-resistant materials such as clay paper plaster plastics fibres and pliable metals and their related technologies.

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