The cell has several types of membrane transport alternatives, being the simple diffusion, facilitated diffusion, and active transport one of the options for the cell to exchange molecules between internal and external environment.
The types of cell transport:
1 - Simple Diffusion: is a process that does not need energy (passive), used to transport small and nonpolar molecules from a region of higher concentration into a region of lower concentration (in the gradient concentration direction);
2 - Facilitated Diffusion: is a process that does not need energy (passive), used to transport larger ions and polar molecules with the help of carrier proteins or pore proteins (transport proteins);
3 - Active Transport: There is two types of active transport, primary active transport is used for molecules moving against their gradient coupled to the hydrolysis of ATP, and secondary active transport is for molecules going with more molecules against their gradient. It is a process that needs energy (active) to happen, going always against the gradient of concentration of the cell.
Atrazine is one of the most widely used herbicides throughoutthe world. Some studies have shown that the chemical has affectedthe sexual development of frogs, most notably, leopard frogs (Rana pipiens).femalemaleOne study suggested that male tadpoles exposed to the herbicide develop into female frogs. These mutated female frogs, accordingto the study, have the ability to reproduce with other males. However, the mutated frogs can only produce male offspring.This case demonstrates howA. the activities of organisms can change the environments in which they live.OB. chemicals introduced to the environment by humans affect only the organisms they were designed to affect.OC. factors in the environment can change the characteristics of organisms.D. chemicals introduced to the environment by humans have no effect on the ecosystem.
The case the exersice tells is an example of how introduced subtances to a particular environment have a negative impact on the species' health, as states the C answer option: "factors in the environment can change the characteristic
Read the following paragraphs from the section "Open Defecation Is A Dangerous Practice."In sub-Saharan Africa — the lands south of the Sahara desert — the proportion of the population practicing open defecation is slightly smaller. It stands at around 23 percent. Still, 40 percent of the population in this region lacks safe drinking water. Moreover, gender inequality there is more prominent than in South Asia. In sub-Saharan Africa, more than 25 percent of the population must walk 30 minutes or more to collect water. This task falls on women and girls nearly all the time. In fact, this collection happens in many poorer, developing nations. It takes critical time away from women.Moreover, Africa has a high risk of desertification. This is the process by which land becomes desert. This reduces the availability of freshwater even further and increases the threat of water inequality in the future.How is the central idea developed in these two paragraphs?Question 4 options:by giving an example of how lack of infrastructure and advanced treatment facilities cause water inequalityby showing that sub-Saharan Africa is the region most affected by water inequality in the worldby describing how lack of fresh drinking water affects people suffering from water inequalityby explaining how open defecation is the main reason behind contamination of water
The correct option is the first one "by giving an example of how lack of infrastructure and advanced treatment facilities cause water inequality". Since, the paragraphs deal with these two core ideas: 1.- desertification danger and its consequences; 2.- the precarious conditions and gender inequity to obtain water.
In a respiration experiment we are measuring the rate alcoholic Fermentation in yeast by measuring the amount of CO2 produced Please assist with following questions
Answer and explanation:
1. sources of error- in the experiment, the amount of carbon dioxide released by east is monitored, a source of error could be the carbon dioxide present in the atmosphere which would interfere with the results.
2. baking recipes add sugars and molasses to provide carbohydrates for the yeast. this acts as a source of energy for the fermentation process.
3. the respiration of yeast could be monitored by measured the amount of sugar used or by measuring the amount of ethanol produced in the respiration process
4. high concentrations of sugar my inhibit yeast activity most likely because of the high osmotic concentration which prevents yeast from getting enough water for growth. as the osmotic concentration increases a yeast cell will reach a pont where water moves out of the cell.
Which classification includes more genera? A class or family?
Answer: The answer would be CLASS.
Explanation: If we refer to the taxonomic level of classification,
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
we can see that CLASS ranks higher compared to Family. So, the Class has a wide range of genera that will belong to it than Family.
The nervous system is responsible for?
Answer:
The nervous system transmits signals between the brain and the rest of the body, including internal organs.
Explanation:
The nervous system's activity controls the ability to move, breathe, see, think, and more.
The body has three lines of defence. Which of the following is NOT one of them? I picked ‘B’ but I’m not sure if I’m correct
The human body has three lines of defense.
-The first line of defense is physical and chemical barriers, such as the skin, mucous membranes, enzymes, stomach acids, and antimicrobial molecules.
-The second line of defense corresponds to nonspecific innate responses, cellular responses, for example, the phagocytes, proteins, for example, the complement system, and other responses like fever and inflammation.
-The third barrier of defense corresponds to the adaptative immune system and it consists of the immune response carried on by the T-cells, B-cells, and antibodies.
All of the options are parts of the three lines of defense of the organism, A and B correspond to the first line of defense, C corresponds to the second line of defense, and D corresponds to the third line of defense.
None of the given options is a correct answer to the question.
How many credits are required for an associate degrees,bachelors degree,masters degree and doctorate degree list in order
Help pls:)
Answer:
Associates: 60
Bachelors: 120
Masters: 30-60
Doctorate: 60-120
Which of the following was NOT an important piece of farming technology created during the Industrial Revolution?
Responses
icebox storage
irrigation system
food canning systems
plow with interchangeable parts
Answer:
Explanation:
B correct me if im wrong.
Answer: The correct answer is irrigation system
Explanation: This answer has been confirmed correct.
What type of growth graph is shown below for a woodpecker population?text Question 10 options:exponential growthlogistic growthlinear growth
When we are talking of population growth we must take into consideration more factors than just growth rate. In the case of exponential growth, we have that the growth rate per capita, that is to say per individual, is constant regardless of the population size, so it grows as the population grows. Meanwhile, in logistic growth, the growth rate per capita creases as the population size approaches a maximum imposed by the limiting resources, that is to say, the carrying capacity of an ecosystem. Therefore we can say that the correct answer is logistic growth.
Which of the following does an ecologist study?
OA. Interactions between living organisms and the natural
environment
B. Historical changes in forms of government and economic
systems
C. The effects of smaller factories on internal trade
D. The impact of technology on communications and human
relationships
Answer:
The answer is A
Explanation:
An ecologist studies the relationship between living things and their habitats.
Building and sporulation are forms of __ reproduction
Answer: Asexual Reproduction
Explanation:
Budding and spore formation are two types of asexual reproduction methods. Hence, gamete formation and fertilization do not occur in both types. Both cases involve a single organism or a parent. Also, the offspring is genetically identical to that of the parent in both methods.
elect 2 that apply.Which of these are monotremes? Select all that apply.kangaroosgiraffeduck-billed platypusdogkoala bearsspiny anteater
Answer:
Duck-billed platypus and spiny anteater
Which group of scientists introduced the Three Domaine System?Aristotle and SocratesB. Fox and LinnaeusC) Woese and Fox
Solution:
The three-domain system is a biological classification introduced by Carl Woese et al (Fox). in the year 1990. In this classification, the cellular life forms are divided into the following 3 domains;
1. Archaea,
2. Bacteria and
3. Eukaryotes.
So that, we can conclude that the correct answer is:
C) WOESE AND FOX.
I need help with 1-3 !I need three good questions
1. a. What are the different environment that are home to various kind of organisms?
b. What are the environmental factors affecting the population size of a certain species?
c. How can an organism adapt to different kinds of environment?
The first question is regarding biosphere. The second is about carrying capacity. The third is about adaptation.
Can someone help with this ? Thank you if you can actually help
Answer:
a
Explanation:
Vascular plants have several specialized organs. Which one is matched correctly?A. Fruits: specialized in reproductionB. Cones: Specialized in reproductionC. Flowers: Specialized in reproductionD. All of them are correct
The vascular plants have several specialized reprodutive organs, which one responsible for one stage of the process of reproduction. The flowers are reprodutive organs, as well as fruits and cones, however they function in reproduction is distinct. The flowers is the most complex reproductive organ, since it is composed by for different structures (carpels, staments, petals and sepals), the cones are where the seeds are produced in the female plants during sexual reproduction after being fertilised by male gametes (pollen), and the fruits are the result following the pollination that are important to continuity of plants generations. Therefore, the alternative D (all of them are correct) is the answer for that question.
Give the order of the following events from earliest to most recent.1. Multicellularity2. Earliest Eukaryotic cells3. First Plants4. Formation of the earth5. First Primates6. First mammals7. Earliest prokaryotic cells8. First reptiles
The first event would be the formation of the earth, since in the beginning, conditions were so extreme that life was not possible. The next event would be the origin of life which occurred with the first prokaryotic cells since they are simple cells in structure. Later, there would be eukaryotes, more complex cells, with a nucleus and other organelles such as mitochondria. Eventually, the interaction between cells gave rise to multicellularity and with this, the multicellular organisms were formed, the first ones being plants, followed by reptiles in the Carboniferous and mammals in the Jurassic period. And because primates are mammals, they would be in the last place.
What features do skeletal muscle cells have that you can see under a microscope?A. long and thin with strìations and many nucleiB. small, striated, and only 1-2 nuclei per cellC. smooth, 1 nuclei, and connected by gap junctions
Skeletal muscle cells seen under a microscope would have long and thin striations an many nuclei, since this kind of cells, are actually
Answer:
A. long and thin with striations and many nuclei
Explanation:
Skeletal muscle cells are highly elongated cells with many nuclei. Under a microscope, skeletal muscle cells have a striated appearance.
Does lymph can direct through the arteries
Lymph, which is a substance different from the blood that carries out nutrients from the extracellular media of the different tissues of our body, flows through specific vessels, known as lymphatic vessels, so they don't go directly through the arteries, as we can see in the following picture:
I need help with this practice problem My questions are located at the top of the pic
Hi. We just had a session with this same question is there any doubt left?
facilitated diffusion across a biological membrane requires ______ and moves a substance ______ its concentration gradient.
Facilitated diffusion is the process by which molecules diffuse across the plasma membrane with the assistance of membrane proteins like channels and carriers.
What main function of facilitated diffusion in membrane?Diffusion is the flow of chemicals across a biological membrane from an area of higher concentration to one of lower concentration, and it is facilitated by the usage of a transport molecule.
Because substances move in the direction of their concentration gradient, chemical energy is not directly needed.
Solutes diffuse through transport proteins in the plasma membrane when their diffusion is facilitated. A form of passive transport is facilitated diffusion.
Therefore, facilitated diffusion across a biological membrane requires transport proteins and moves a substance down its concentration gradient.
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. you want to design a breathing machine that will bring 500 ml of air into the lungs. you begin with 100 ml of air at 2 atm of pressure. how would you change the pressure in your machine to accomplish your goal?
The pressure would be changed to 4 atm in the machine to bring 500 ml of air into the lungs.
What is pressure and what is breathing and why the pressure is brought up to 4 atm?Breathing is a biological phenomena , biological practice to inhale the air and exhale CO2 through lungs.In the process the inhalation lasts for 3 sec and exhalation for 3.5 seconds of time.Pressure is the quantity representing the force per unit area of the region in a considered time.To design a machine bringing 500 ml of the air into the lungs, initially it was at 100 ml of air at 2 atm .Hence the pressure would be changed to 4 atm in the machine to bring 500 ml of air into the lungs.To know more about breathing visit:
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Mutations can affect genes that control how a cell divides. This can result in cancerous tumors. A mutation that is not detected and repaired by the cell would produce which of these results? A. an interruption in the process of mitosis B. an interruption in the process of mitosis C. undifferentiated cell division D. uncontrolled cell division
All cancers begin with a gene mutation giving rise to a faulty protein participating in cell reproduction, even if it is a minor change that occured in this protein. The major problem is that the cell will divide itself nonstop, forming a mass of mutated cells (a tumor). If they start to divide in an undifferentiated way, it can even access other tissues and becom a more serious problem. But, in order to define what causes a tumor at first, the uncontrolled cell division is the beginning of it all.
Therefore, the correct answer is D. uncontrolled cell division
Why does the majority of photosynthesis occur in the leaves:1: roots are not exposed to sun since they are underground2: leaves contain chloroplasts which create store energy molecules3: all answers are correct
The correct option is 3.
The leaves have specific shapes that create the most efficient surface to absorb sunlight. Also, stomas are found mostly on the leaves, structures that allow the gas exchange: the CO2 enters into the leave, and O2 leaves it.
41
2 points
Atoms and molecules represent the
O organ
0000
cellular
chemical
tissue
level of organization.
Time Remaining
Answer: Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds.
Explanation
JESUS HEARS EVERY PRAYER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! EVEN WHEN YOU CAN'T SEE OR HEAR HIM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Rigid motion
(Fill in the blank)
ALWAYS
SOMETIMES
O NEVER
preserve angle measures.
Answer: Rigid motions preserve collinearity. Reflections, rotations, and translations are all rigid motions. So, they all preserve distance, angle measure, betweenness, ...
3 pages
Explanation:
ALWAYS AND FOREVER
Which animals are cold-blooded, breathe with lungs, most lay eggs, although in some the eggs hatch inside the female, and have scales or plates?Question 17 options:FishReptilesMammalsAmphibians
Answer: Fish!
Explanation:
If it were a mammal, It would live birth only, Frogs do not have scales, Reptiles have egg-birth only.
In the catabolic pathways, which two molecules are major electron acceptors? After they accept electrons, which electron carriers do they become? What is the primary function of the electron carriers?
The two molecules that are major electron acceptors in the catabolic pathways are NAD⁺ and FAD⁺, whereas NADH and FADH₂ can be considered as electron carriers. They play a fundamental role to produce energy as ATP.
What are electron carriers?The electron carriers are specific molecules that act during cellular respiration in order produce Adenosine triphosphate from ADP and phosphate, which is the energy coin of the cell.
Therefore, with this data, we can see that the electron carriers such as NADH and FADH₂ are fundamental for producing ATP, while NAD⁺ and FAD⁺ accept electrons during this process.
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Which group creates the most pollution?O developing countriesO hunter-gatherersO developed countriesO special interest groups
What creates most pollution is the burning of fossil fuels to produce energy for eletricity and transportation, because of the release of carbon dio
Which do you think has more influence on a person's weight: genetics, upbringing, or the environment?
Genetics may play a great role, but upbringing could be more important since the eating, exercising and food selection habits could be acquired during this period. Aditionally, the often high price of healthy food and lack of knowledge about how to follow a balanced diet are some socioeconomic asociated factors, related to the upbringing, that must not be ignored.
Answer:
environment
Explanation:
example public