Over 400 years ago, the bark of the cinchona tree was discovered to contain a chemical compound called quinine. Quinine was, and still is, used to cure and prevent malaria. This is an early example of __________
a. biotechnology b. scientific modeling
c. genetic engineering d. genomics
PLEASE HELP ITS A TEST
Answer:
a
Explanation:
Which structure provides food for this cell
Answer:
The chloroplast
Explanation:
It makes sugars that feed cell's machinery
Pls help me answer this question
Answer:
G all cells arise from pre existing cells.
will they give you new textbooks im 10th grade now when I was in 9th grade saw 10th graders are using same biology textbook and im worried if school will not give me new textbook for this semester
will school me new textbook ?
Accurate answer pls
Answer:
It depends on the school you are going to...And if they don't give you any new biology textbook then it means that all you will be learning in grade 9 and 10 is already in the textbook which you will have to continue using.
Why do you think plant cells need a cell wall as well as a cell membrane? What do you think would happen to plants if they did not have a cell wall?
Answer:
im sorry i dont know the answer
Explanation:
What type of water is more dense?
A. Salt water
B. Fresh water
Answer:
Salt water is more dense than fresh water.
Explanation:
Answer:
salt water
Explanation:
because it has more dense than fresh water
What is a stimulus? What is homeostasis? How are irritability and homeostasis related? Describe an example of homeostasis, response and adaptation in a living organism.
Answer:
All is in order.......
stimulus is a thing or event that evokes a specific functional reaction in an organ or tissue.
homeostasis is the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
Irritability is that characteristic of living organisms in being aware of, and being able to respond to, a stimulus which tends to disturb the steady state or homeostasis which all organisms prefer for maintaining life.
Humans' internal body temperature is a great example of homeostasis. When someone is healthy, their body maintains a temperature close to 98.6 degrees Fahrenheit (37 degrees Celsius). Being warm-blooded creatures, humans can increase or decrease temperature internally to keep it at a desirable level.
plz give brainlist
hope this helped
Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. What is the independent variable for the tadpole diet experiment?
Answer:
TYPE OF DIET
Explanation:
Independent variable of an experiment is that variable that is subject to manipulation or changing by the experimenter in order to effect a response in the dependent variable.
According to the experiment in this question, the type of diet is changed for different groups of tadpoles in order to see the effect on their average weight. Based on this, the independent/manipulated variable is the TYPE OF DIET administered to each group of tadpole while the growth (average weight) of the tadpoles is the dependent variable.
Pasta, Fruit, Bread, and Rice are examples of what type of food?
A. Proteins
B. Nucleic Acids
C. Carbohydrates
D. Lipids
What are the four biogeochemical processes that cycle matter through the biosphere?
Answer:The water cycle, carbon cycle, nitrogen cycle, and phosphorous cycle are the 4 types of processes that cycle matter through the biosphere. By what 2 processes is water cycled from land to the atmosphere
Explanation:
if any one can help me in biology sem. 2 pls don't hesitate to say somethin
Answer:
Mitotic inhibitors are used in cancer treatment, because cancer cells are able to grow and eventually spread through the body (metastasize) through continuous mitotic division. Thus, cancer cells are more sensitive to inhibition of mitosis than normal cells.
What did the Miller-Urey experiment demonstrate?
What is the basic energy source of all cells?
The basic energy source is Adenosine triphosphate that are formed in mitochondria.
What is mitochondria?Mitochondria are membrane-bound cell organelles that produce the majority of the chemical energy energy to operate the cell's biochemical reactions (mitochondrion, singular).
Adenosine triphosphate, abbreviated ATP, is a chemical compound that cells use to store and deliver energy. All types of cells use ATP as their primary energy source.
Thus, the basic source of cell's energy is ATP.
For more details regarding mitochondria, visit:
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Patient X is a 32 year old female. She goes to the gym less than 5 times a month. She
recently went to the doctor and it was determined that her kidneys are retaining sodium
causing an increase in blood volume. Use the information provided about this patient to
select the correct blood flow you would expect the patient to have and the correct effect
of that blood flow
The nucleolus __________. The nucleolus __________. assembles ribosomes synthesizes ATP stores chromatin synthesizes proteins
Answer:
The correct answer is: assembles ribosomes.
Explanation:
The nucleolus is the largest structure in the nucleus of a cell body, granular, and round structure. The nucleolus is made up of components like RNA and proteins In the center of the nucleus of a cell.
This is associated with the synthesis of ribosomes and the formation of the rRNA or ribosomal RNA. The ribosomal RNA and proteins combine together to form subunits of the ribosomes that are move out of the nucleus to the cytoplasm in order to perform their function.
Thus, the correct answer is: assembles ribosomes.
What is the primary function of photosynthesis?
Answer:
convert solar energy into chemical energy and then store that chemical energy for future use.
Explanation:
hope it help
Explanation:
to convert solar energy into chemical energy and then store that chemical energy for future use.
A lizard sitting on a rock would be considered the ______level of organization.
Answer:
Organism
Explanation:
The organism level of organization is the level of organisation that comes after the organ system level of organisation. The organism level of organisation is the level at which the living system is complete and comprises of the interconnection and synergy of the lower organization levels.
At the organism or life form organizational level, all the characteristics of living things are manifested.
The basic living system, a functional grouping of the lower-level components, including at least one cell.
Which of the following structures functions to isolate the genetic material
from the rest of the eukaryotic cell?
A. Cell membrane
B. Nuclear envelope
C. Nuclear pore
O D. Cytoskeleton
Answer:
C. Nuclear envelope
Explanation:
Answer:
B
Explanation:
Nuclear envelope
Describe why this is a controlled experiment.
A. Only one variable is changed
B. two variables are changed
C. the plants grew tall in the control group
D. the plants grew tall in the experiment
Barometers, instruments that measure atmospheric pressure, were once the best way to predict that a hurricane was coming. Today, scientists
still study the changes in atmospheric pressure caused by hurricanes. They can also track hurricanes using satellite photography. What does the
change in how scientists study hurricanes indicate about scientific progress?
Scientists always look for new questions to investigate.
Scientists always use new variables when performing investigations.
Scientists must often choose between disagreeing data.
Scientists must often find ways to combine data from different sources.
Next
Answer:
Scientists always look for new questions to investigate.
Explanation:
Every scientific investigation begins with an observed problem, which in turn leads to a scientific question. This scientific question is the basis of the scientific method that leads to new discoveries.
In this question, barometers were once the best way to predict that a hurricane was coming. However, in recent times, hurricanes are now tracked using satellite photography. This new discovery about studying hurricanes is as a result of new questions that emerged. The new scientific questions, which are testable, led to a change in how scientists study hurricanes indicate.
What role does the nitrogen cycle play in the life cycle of a plant? ( please help me! thank you! )
Answer:
Assimilation
Explanation:
This is how plants absorb nitrates from their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll.
In nature, mutation rates are usually ______ to maintain alleles that are not favored in a population by natural selection.
In nature, mutation rates aren't usually high enough to maintain alleles that are not favored in a population by natural selection.
While in the wild, many populations are led by natural selection. This means that favorable traits are passed down through generations, while unfavorable traits are not. Traits that are best suited for the environment of the organism will prevail to help the chance of survival.
Mutation rates usually aren't high enough to create traits that are unfavorable to an organism. While mutations are still possible, it is still unlikely. The traits that are chosen by natural selection are most likely to be passed onto organisms and their offspring.
which nutrient produces a purple colour when mixed with biuret solution A. fat B. protein C. reducing sugar D. starch
Answer: B. Protein
Explanation: biuret solution is a chemical which is used to test for the presence of protein in any substance and it turns purple when protein is present.
explain why molecules do not have electric charge
Answer:
Explain why molecules do not have electric charges. individual molecules contain the same number of electrons and protons. they cancel each other out. ... Molecules form when atoms bond together with (covalent) [kohVAYlent] bonds.
You would expect high levels of blood glucose and the presence of glucose and ketones in Mr. Gutteman's urine if:
Answer:
The correct answer would be : Mr. Gutteman's pancreas is secreting too little insulin.
Explanation:
Insulin is a hormone produce by pancreas that maintain glucose level by using glucose for energy or to store for future use. Insulin prevent blood sugar level to go too high or too low.
Less production of this hormone cause high glucose level in blood that leads to glucose, ketone bodies in urine of a person.
Thus, the correct answer is : Mr. Gutteman's pancreas is secreting too little insulin.
Data Collection: Pinky’s science fair project in junior high focused on an observation that the crickets outside her window chirped less frequently when the temperature was colder. Fun Fact: There are free “cricket chirp calculators” online you can explore, which didn’t exist freely online when Pinky was in junior high. Consider if data was collected consisting of the average number of cricket chirps at different temperatures in her backyard. 10. Which variable would be an independent variable?
Answer:
Different temperatures in her backyard
Explanation:
The independent variable would be the different temperatures in Pinky's backyard.
The independent variable is a variable whose value is not affected by another variable during research. It is a variable that directly affects the actual variable that is measured - the dependent variable. The independent variable is usually varied in order to see the kind of effect it will produce on the dependent variable.
In the case of Pinky, the different temperature at the backyard affects the number of cricket chirps. Hence, the temperature is considered the independent variable while the number of cricket chirp is considered the dependent variable.
The specific molecular changes that occur when a drug binds to a particular target site or receptor are referred to as
Answer:
Drug action.
Explanation:
Drug action can be defined, in short, as the action of the drug on the body. The effects of almost all drugs are a consequence of their interaction with macrocellular components of the body. These interactions modify the function of the relevant component and thereby initiate the biochemical and physiological changes that characterize the response or reaction to the drug. Receptors are cellular structures that have a specific purpose and that are activated in their action by different substances.
The cell walls of fungi are different than the cell walls of plants because they contain
Answer:
fungi cotains methenaol and pkants contain arbon
Explanation:i just did it
Answer:
Fungal cell walls are strengthened by Chitin instead of cellulose.
If two events are correlated, what must be true? (1 point)
O Both events have the same result.
O Both events have the same cause.
O The events tend to happen together.
O One event caused the other.
Answer:
Both events have the same cause.
Explanation:
Correlation in statistics refers to the measure of the relationship between two variables. Simply put, two variables are said to be correlated if a mutual relationship exists between them. This means that if two events correlates, a relationship in which, both events have the same cause, exists between them.
Correlation can be positive or negative depending on whether the increase of one event causes the other to increase (positive) i.e. they both move in a similar direction or the increase of one event causes the declination of the other (negative) i.e. they move in opposite directions.
Which resource does NOT need to be cycled by ecosystems because a continuous, unlimited supply is available?
Answer:
Solar energy
Explanation:
Solar energy is the resource that doesn’t need to be cycled by ecosystems because a continuous, unlimited supply is available.
The Sun provides the solar energy which is very important in plant’s food production and it isn’t dependent on the ecosystem and seasons. This is because the Sun provides light during the day and we experience daytime all year round. This is why the solar energy has a continuous, unlimited supply.