The plasma membrane acts as a barrier in cells of all types to control the movement of substances into and out of the cell.
a.explain how the plasma membrane acts as a semi-permeable barrier to various types of molecules based on its molecular structure.
b.describe, in detail, three ways in which large molecules such as proteins can cross the plasma membrane.
Unit seven: lab questions the jungle search for viruses <- your first lab link 1. where did aids/hiv originate? how did it move to humans? 2. why is it important for human health to study viruses at the "viral chatter" stage? 3. how might people come into contact with viruses that could jump to humans? 4. why have risky behaviors for zoonotic diseases continued even though we know that some of these diseases can infect humans? 5. why is the global tracking of zoonotic diseases important? genetically engineering the avian flu <- your second lab link 1. why is avian flu a concern? 2. how does the virus get into a cell? what happens once the virus gets in? 3. what would make it possible for the avian flu to be transferred from human to human? 4. why are scientists looking at the 1918 flu?
HIV attacks human's immune
system just like SIV (the Simian Immunodeficiency Virus)
attacks chimpanzee's immune systems. Scientists found similarities in these virus and they believe that HIV had origin in chimpanzees and then crossed to humans that were hunting them.
2)why is it important for humans to study the "viral chatter" stage?
The viral chatter stage it's when the virus is moving from animals to humans it's very important for humans to study this stage because it could lead to earlier diagnoses before it reaches the human stage.
3. contact with viruses that could jump to humans:Which of the following remains relatively constant in an ecosystem? A-number of organisms B-amount of matter C-number of species
Answer:
The correct answer would be B- the amount of matter.
The amount of matter remains the same in any ecosystem.
It can be explained with the help of the law of conversation of mass.
It states that mass can neither be created nor it can be destroyed but it can transform from one form to another.
Bruce is experiencing sudden, rhythmic waves of pain in his groin area. he has noticed that, although he is consuming fluids, his urine output has decreased. from what condition is bruce suffering? how is it treated? how can he prevent future episodes?
Final answer:
Bruce's symptoms suggest he is suffering from renal colic due to kidney stones, and he may need medication, increased fluid intake, and possibly medical interventions. Preventative measures for kidney stones include staying hydrated and dietary adjustments. It is crucial for him to seek medical attention for a proper diagnosis and to determine if related conditions like BPH or a UTI may be present.
Explanation:
Bruce is likely suffering from renal colic, which is a condition typically associated with kidney stones. Kidney stones can cause sudden, rhythmic waves of pain in the groin area and can lead to a decrease in urine output, perhaps due to obstruction. Treatment for kidney stones often includes pain relief medication, hydration, and possibly medical procedures if the stones are too large to pass naturally. To prevent future episodes, Bruce can stay hydrated, reduce salt intake, and maintain a diet low in oxalate-rich foods.
Additionally, given Bruce's symptoms and past health history, the possibility of a urinary tract infection or prostate issues, such as benign prostatic hyperplasia (BPH), should not be ruled out. BPH treatment varies from medication to potentially surgery for severe cases. It is vital for Bruce to see a healthcare professional for an accurate diagnosis and appropriate treatment.
Part of developing a strategy for finding a job is to identify your target.
a. True
b. False
True, identifying your target job and employer is a key part of formulating a job search strategy. This focused approach aids in customizing your applications and sets a structured plan for your job search with achievable goals and effective utilization of the hidden job market.
Part of developing a strategy for finding a job is indeed to identify your target. This is a true statement. When you begin your job search, having clarity about your ideal job role, the industry in which you want to work, and the companies you'd like to be employed by are critical steps in mapping out your job search strategy. This focused approach allows you to tailor your resume, cover letters, and even prepare for interviews that are specific to your sector of interest. It helps in setting short-term and long-term goals, which can give structure and motivation to your job-seeking efforts.
Additionally, self-awareness regarding your strengths and weaknesses is essential in your job search as it helps you to understand what you can offer to potential employers and where you may need to improve. Understanding and targeting the hidden job market is also part of a savvy job search strategy, requiring you to network, join professional organizations, and employ other tactics that may unveil job opportunities not advertised publicly.
This comprehensive approach ensures that the time you spend on your job search is more strategic, making you a more competitive candidate in today's job market.
i need help plz
Jack bends and straightens his arm during arm wrestling. Which type of muscle does Jack use in the process?
Cardiac muscles
Involuntary muscles
Skeletal muscles
Smooth muscles
Answer:
Skeletal muscles
Explanation
Cardiac muscles are only found in the heart.
Involuntary muscles are muscles the you can not move on your own such as your heart, your eyelids, and your your organs.
Skeletal muscles are the muscles that are connected to the bone by a thick band of tissue called a tendon. This tissue allows the body to react quickly.
Smooth muscles are a tissue found in many of the body's internal organs, such as the stomach, intestine, bladder, and blood vessels.
Hopes this helps.
Name a rapid method for the identification of enterobacteriaceae
Why do endurance athletes load up on carbohydrate-containing foods before a big event? why don't they just fill up on fat and protein as well?
predict what would happen to the plants if the fungi died off
Final answer:
The absence of symbiotic fungi from the soil would severely disrupt plant growth due to a lack of essential nutrient uptake, cause a build-up of undecomposed organic material, and negatively impact biogeochemical cycles and ecosystem health.
Explanation:
If symbiotic fungi were absent from the soil, the impact on plant growth would be significant. Plants form relationships with fungi, including structures known as mycorrhizae, which are critical for nutrient uptake. Fungi assist in acquiring nutrients such as phosphorus and nitrogen that plants need to grow. Without these symbiotic partnerships, plants would struggle to obtain these essential nutrients, leading to poorer growth and reduced vitality. Furthermore, fungi play a crucial role in decomposing organic matter, recycling nutrients back into the soil. Without fungi, the accumulation of undecomposed organic material would disrupt biogeochemical cycles, resulting in a build-up of carbon in dead matter and waste, and impair other nutrient cycles, such as nitrogen fixation and phosphorus release. Over time, the absence of fungi could lead to a decline in the structural diversity of forests and other habitats, negatively impacting the broader ecosystem and potentially leading to the extinction of numerous species.
Index fossils allow geologists to _____.
Index fossils enable geologists to determine the geological ages of fossils and calculate the rate of speciation of early organisms, which provides an insight into the history of evolution on Earth.
Explanation:Index fossils play a crucial role in geology by allowing researchers to determine the geological ages of the fossils. This information is used to calculate the rate of speciation of early organisms. Index fossils are typically sought in horizontal rock layers, across a variety of rock types, and they are particularly valuable when they are abundant within these layers.
The investigation and categorization of these fossils aid in creating a layout of the biological history on Earth, displaying the timeline and progression of evolution. For instance, the similarities in morphology between the appendages of whales, birds, and mammals is suggestive of these species sharing a common ancestor.
Thus, the process of studying index fossils is intricate, demanding careful excavation techniques, and detailed documentation in order to provide the most accurate picture of our planet's geological and biological past.
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One treatment for high blood pressure is taking diuretics that prevent the kidney collecting ducts from reabsorbing water. How would diuretics reduce blood pressure?
B. By decreasing blood volume
When there is excess fluid in the body, it can lead to an increase in blood volume and pressure. By reducing the amount of fluid in the body, diuretics can help to decrease blood volume and pressure, which can be beneficial in treating hypertension (high blood pressure).
What are diuretics?Diuretics are medications that work by increasing the excretion of urine, which helps to reduce the amount of fluid in the body. By preventing the kidney collecting ducts from reabsorbing water, diuretics increase the amount of water that is eliminated from the body through urine.
Diuretics can also help to reduce the amount of sodium in the body, as they increase the excretion of both sodium and water. This can help to lower blood pressure, as excess sodium in the body can lead to an increase in blood volume and pressure.
Overall, diuretics are a common and effective treatment for hypertension and can help to reduce blood pressure by decreasing the amount of fluid in the body and lowering the amount of sodium in the blood.
However, it is important to note that diuretics should only be taken under the guidance of a healthcare professional and as part of a comprehensive treatment plan for high blood pressure.
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You are preparing an injection of a narcotic to relieve a pregnant woman's pain. as you are about to give it, she asks you for a bedpan because she has to move her bowels. your best action would be to
Which form of cell transport allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell?
explain why acid rain, smog, ocean acidification, and global warming are indirect results of air pollution.
Answer:
In all of the mentioned cases, the influence of air pollution is not directly associated with the toxicity of the gases. The ocean acidification and acid rain take place when the pollutant gases in the environment react to produce acid. Smog influences the environment by filtering out sunlight and leaving less for the plants to utilize. Global warming takes place as greenhouse gases make Earth hold more of the heat, which it had captivated from the Sun.
Air pollution releases substances like sulfur dioxide and nitrogen oxides, which lead to acid rain. Nitrogen oxides and volatile organic compounds create smog. Carbon dioxide contributes to ocean acidification and global warming.
Acid rain, smog, ocean acidification, and global warming are indirect consequences of air pollution due to the release of various pollutants into the atmosphere. Air pollution primarily involves the emission of harmful substances like sulfur dioxide (SO2), nitrogen oxides (NOx), carbon dioxide (CO2), and volatile organic compounds (VOCs) from industrial processes, vehicles, and other human activities.
1. Acid Rain: SO2 and NOx react with water vapor and oxygen to form sulfuric acid and nitric acid, which, when they fall back to Earth as precipitation, cause acid rain. This harms ecosystems, aquatic life, and infrastructure.
2. Smog: Ground-level ozone (formed by chemical reactions involving VOCs and NOx in the presence of sunlight) is a key component of smog. It irritates respiratory systems and reduces air quality.
3. Ocean Acidification: Excess atmospheric CO2 dissolves into seawater, creating carbonic acid. This lowers ocean pH, harming marine life and coral reefs.
4. Global Warming: The release of greenhouse gases like CO2 and methane traps heat in the atmosphere, leading to global warming and climate change. These indirect consequences illustrate the complex and interconnected nature of environmental issues stemming from air pollution. Addressing air pollution is critical to mitigating these environmental challenges.
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_____ is a type of parasitic worm that can be transferred to humans who eat raw or undercooked fish.
a. salmonella
b. cryptosporidium
c. anisakis
d. giardia
Which kind of aging is most strongly influenced by diet and exercise?
Describe how nuclear transplantation was used to produce dolly
Assume sexual reproduction occurs . What is the number of chromosomes in the zygote if the parents reproductive cells can or gametes contain 12 chromosomes each
A) 6
B) 24
C) 48
b.24 i just had this question
A flood kills most of the population of ants that live near a river. after the flood, the ant population increases, but its allele frequency is different. what type of situation is this?
Answer:
C) bottleneck
The complete question is:
A flood kills most of the ants that live near a river. After the flood, the ant population increases, but its allele frequency is different. What type of situation is this?
a. genetic drift
b. mass extinction
c. bottleneck
d. founder
Explanation:
There are two most common forms of DNA drift:
Genetic drift is a naturally occurring shift in the frequency of an allele. In contrast, a bottleneck effect occurs when the population decreases rapidly. A flood reduced the ant population in this region, demonstrating a bottleneck effect that results in genetic drift.
Over time, this might alter a population's genetic makeup, making them more vulnerable to environmental hazards or illnesses. The flood significantly impacted the ant population. The abrupt decline in population due to the bottleneck effect may have genetic repercussions.
The situation described in the question, where a flood kills most of the ant population near a river, and the allele frequency in the population changes afterward, is an example of the bottleneck effect.
Event Occurs: A flood, which is a natural disaster, randomly reduces the ant population near the river. This sudden decrease in population size is what initiates the bottleneck effect.
Random Sampling: The surviving ants are a random sampling of the original population. This means that the survival of these ants is not necessarily related to their genetic traits but more related to chance.
Change in Gene Pool: The alleles (different versions of a gene) carried by the surviving ants become the entire genetic pool for the post-flood population. Since these surviving ants may not be genetically representative of the original population, the allele frequencies can change significantly.
New Allele Frequency: The new population will have different allele frequencies compared to the original population. Some alleles might be lost completely, while others may become more common.
Genetic Drift: The small population of surviving ants is then subject to genetic drift, which can further alter allele frequencies randomly over time, potentially reducing genetic diversity even more.
skin stem cells can only produce other skin cells. what does this indicate about skin stem cells?
A. They are multi-cellular
B. They are prokaryotic
C. They are unipotent
D. They are aerobic
Answer:
the answer is C
Explanation:
Scientists can explore whether two different animal species have evolved from a common ancestor, using evidence
Explanation:
These are the answer choices they didn't put:
analysis of strands of DNA
studies of embryos during development
comparison of bones and muscles
comparison of experiences from each organism
Scientists can explore whether two different animal species have evolved from a common ancestor by looking for evidence of shared traits or features.
These shared traits, called homologies, can include anatomical features such as bones or body structures, as well as genetic or developmental similarities. For example, the wings of a bat and the arms of a human both share the same bone structure, indicating that they evolved from a common ancestor with that same bone structure.
Additionally, genetic studies can reveal similarities in DNA sequences or gene expression patterns between different species, further supporting the idea of a shared evolutionary history. By examining these and other types of evidence, scientists can reconstruct the evolutionary relationships between different species and gain a better understanding of how life on Earth has changed over time.
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Provide an example of both non-specific and specific defense in the body. pick an invader or injury and describe how the body may respond.\\
Describe two advantages of genetic engineering. (4 points)
Which type(s) of economies interact with other economies?
a. only closed economies
b. only open economies
c. closed economies and open economies
d. neither closed nor open economies?
Answer: b. only open economies
A closed economy is a self=sufficient economy and does not need trade activity with outside economies. There are no imports and exports.
An open economy is its opposite. It is the type of economy which interact with other economies.
Trade exists in many forms like managerial exchange, technology transfers, and all kinds of goods and services. Economic advantages for citizens of a country with an open economy: 1) Consumers have larger variety of goods and services from which to choose and 2) they have the opportunity to invest their savings outside the country.
Only open economies interact with other economies. An open economy actively engages in international trade, exchanging goods, services, and capital with other nations. In contrast, a closed economy does not participate in international trade.
Explanation:In the context of international trade and global economics, it is the open economies that interact with other economies. An open economy is one that engages in international trade, exchanging goods, services, and capital with the economies of other countries. This is in contrast to a closed economy which does not exchange goods, services, or capital with other economies, and thus does not interact with them.
To illustrate, consider the example of the United States and Canada, both of which maintain open economies. Goods like cars, food, and electronics, as well as services like technology development, travel, and education, are regularly traded between these two countries.
Therefore, the answer to the question 'Which type(s) of economies interact with other economies?' would be b. only open economies.
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Field research does not take place at _____. a toxic waste dump the ocean floor a laboratory the rain forest
A laboratory is the answer.
The apical meristems of a plant are responsible for ________ development of pollen and ova development of the fruit a plant's increase in height a plant's increase in width
A female client is admitted with suicidal tendencies. the client is placed in suicide precautions for the first 24 hours of her stay. ensuring client safety is included in the therapeutic role of:
All plants produce _______ by mitosis and _______ by meiosis. select one:
a. spores; gametes
b. gametes; gametes
c. gametes; spores
d. spores; spores
e. spores; gametes and spores
Answer:
gametes;spores
Where did earth's oxygen come from? select one:
a. produced by volcano exhausts.
b. produced during the formation of the moon.
c. produced by microscopic life over a billion years.
d. delivered by comets to the early earth?
The risk of testicular cancer is greater for which group? (select all that apply) quixlet