Why do lice become resistant to permethrin?
Oct 15, 2019 · Permethrin is safe and effective when used as directed. Permethrin kills live lice but not unhatched eggs. Permethrin may continue to kill newly hatched lice for several days after treatment. A second treatment often is necessary on day 9 to kill any newly hatched lice before they can produce new eggs.
How long does permethrin take to kill lice?
What makes one louse able to survive treatment with permethrin and another louse unable to survive? If there is genetic variation in the louse population independent of permethrin exposure, then some lice are likely to be resistant.
Does pyrethrin kill lice eggs?
Sep 18, 2017 · Another dog was observed to have many nits and a live louse at 28 days post-treatment, and was treated with an alternative lice treatment. Table 1 Mean lice counts and efficacy (%) after a single oral administration of fluralaner or topical administration of permethrin to dogs naturally infested with lice L. setosus
Does malathion kill lice eggs?
a. The parents of a louse exposed to permethrin will result in offspring becoming resistant. b. A louse exposed to other anti-lice treatments will become resistant to all anti-lice treatments. c. A genetic variation in the louse population allows some lice to be resistant to permethrin. d. A louse exposed to low levels of permethrin will eventually become resistant.
Why are some lice able to survive permethrin treatments whereas others Cannot survive quizlet?
Why are some lice able to survive permethrin treatments whereas others cannot survive? Some lice are naturally resistant due to genetic variation.
What change is an example of biological evolution?
Over many generations, ostriches and emus evolved to have larger bodies and feet made for running on land, which left them without the ability (or need) to fly. The same goes for penguins, who traded typical wings for swim-friendly flippers over many thousands of generations.
What inference about the genetic material for all living things would support both the theory of common descent and the theory of natural selection?
What inference about the genetic material for all living things would support both the theory of common descent and the theory of natural selection? It must vary spontaneously and randomly. True or false: Natural selection is only one of several possible causes of evolution.
What characteristics would determine whether structures from two kinds of organisms are homologous?
What characteristics would determine whether structures from two kinds of organisms are homologous? The structures should have identical functions in both organisms.
What is a characteristic that makes an organism able to survive and reproduce in its environment?
To scientists, an adaptation is any characteristic that helps an organism survive or reproduce. Adaptations can be physical as well as behavioral. Most adaptations happen slowly—they are traits that are inherited over many generations.
What makes studying biological evolution essential?
Understanding evolution helps us solve biological problems that impact our lives. There are excellent examples of this in the field of medicine. To stay one step ahead of pathogenic diseases, researchers must understand the evolutionary patterns of disease-causing organisms.
What makes one lose able to survive treatment with permethrin?
What makes one louse able to survive treatment with permethrin and another louse unable to survive? If there is genetic variation in the louse population independent of permethrin exposure, then some lice are likely to be resistant.
What determines which individuals are more likely to survive and reproduce?
According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
How would natural selection progress in lice no longer controlled permethrin?
How would natural selection progress in lice no longer controlled by permethrin? Some lice are resistant to permethrin; permethrin is used to kill lice; lice resistant to permethrin become the most common type.
What do these structures indicate about the evolution of the three organisms?
What do these structures indicate about the evolution of the three organisms? They share a common ancestor. What would be an example of a structure analogous to structure C?
How do the homologous characteristics in different organisms help to identify the evolutionary relationships?
The basic structure of their organs is more or less the same, although they utilize it for varied functions. These organs are known as homologous organs. This does not mean that they share the same ancestor. thus, homologous characteristics help in tracking an evolutionary relationship between different species.Mar 7, 2021
Which is most likely true about two organisms with similar anatomical features?
Which is most likely true about two organisms with similar anatomical features? They are not related.
How long does it take for a nit comb to kill lice?
The medicine may take longer to kill all the lice. Comb dead and any remaining live lice out of the hair using a fine–toothed nit comb. If, after 8–12 hours of treatment, no dead lice are found and lice seem as active as before, the medicine may not be working.
What is the name of the lotion that kills lice?
Brand name product: Ovide. *Malathion is an organophosphate. The formulation of malathion approved in the United States for the treatment of head lice is a lotion that is safe and effective when used as directed. Malathion is pediculicidal (kills live lice) and partially ovicidal (kills some lice eggs).
How long does it take for nit to go away?
After each treatment, checking the hair and combing with a nit comb to remove nits and lice every 2–3 days may decrease the chance of self–reinfestation. Continue to check for 2–3 weeks to be sure all lice and nits are gone. Nit removal is not needed when treating with spinosad topical suspension.
Does Permethrin kill lice?
Permethrin is safe and effective when used as directed. Permethrin kills live lice but not unhatched eggs. Permethrin may continue to kill newly hatched lice for several days after treatment. A second treatment often is necessary on day 9 to kill any newly hatched lice before they can produce new eggs.
Can lice be treated at the same time?
Some experts believe prophylactic treatment is prudent for persons who share the same bed with actively-infested individuals. All infested persons (household members and close contacts) and their bedmates should be treated at the same time. Some pediculicides (medicines that kill lice) have an ovicidal effect (kill eggs).
When to retreat from a ovicidal?
To be most effective, retreatment should occur after all eggs have hatched but before new eggs are produced.
Can you get lice medication without a prescription?
Over-the-counter Medications. Many head lice medications are available “Over-the-counter” without a prescription at a local drug store or pharmacy. Each Over-the-counter product approved by the FDA for the treatment of head lice contains one of the following active ingredients.
Which protein is most likely responsible for controlling DNA replication in all other organisms?
Cyclin B protein is most likely responsible for controlling DNA replication in all other organisms. c. Cyclin B protein is most likely responsible for controlling entry into mitosis in all organisms in which it is found. d.
Which organisms have genes that control cell growth?
The genes responsible for controlling cell growth, DNA replication, and cell division (mitosis) are highly similar in organisms ranging from single-celled yeast to complex humans.
What is the gene that controls cell growth?
True. The genes responsible for controlling cell growth, DNA replication, and cell division (mitosis) are highly similar in organisms ranging from single-celled yeast to complex humans. The protein made from one of these genes, cyclin B, has been extensively studied in yeast and shown to be specifically responsible for controlling the timing ...
What are presenilin proteins?
The human presenilin proteins that are made from these genes are responsible for altering other proteins by cleaving (cutting) them at specific positions. Presenilin proteins that are highly similar to the human ones have been identified in C. elegans, a microscopic nematode worm.
Which protein is most likely responsible for controlling entry into mitosis in other single-celled eukary
Cyclin B protein is most likely responsible for controlling entry into mitosis in other single-celled eukaryotes, but something completely different controls this function in more complex organisms. c. Cyclin B protein is most likely responsible for controlling entry into mitosis in all organisms in which it is found.
Is special creation true?
Most scientists are atheists and so reject the hypothesis of a creative force. d. Special creation is an old theory, so it could not be true anymore. Special creation involves a supernatural creator, which is not observable or measurable in the material universe.
Is a donkey a member of the same species?
a. fat accumulation, insulin resistance, metabolic syndrome. True or false: According to the biological species concept, horses and donkeys could be considered members of the same species because they can mate and produce healthy, albeit infertile, offspring.
Why doesn't the immune system respond to infection by prions?
The immune system doesn't respond to infection by prions because. prions are refolded versions of normal proteins, so the B and T cells see them as normal" and thus ignore them.". Injecting a person with a killed-bacteria vaccine can protect that individual from a disease because the proteins of the killed bacteria.
What percentage of S. aureus isolates are MRSA?
The frequency of some alleles changes. In 1980, only 1% to 5% of all Staphylococcus aureus isolates were MRSA strains. Now 60% to 70% of S. aureus isolates are MRSA strains. This is an example of. directional selection of bacteria.
What happens when a prion is misfolded?
A misfolded prion is able to cause normal prions to misfold, and this continues until the host cell bursts, spreading the infection to other cells. Bacteria reproduce by a process known as. binary fission. All the following have contributed to widespread antibiotic resistance EXCEPT.