Answer:
penicillin was the first antibiotic discovered. Alexander Fleming discovered it in 1928. It was used widely during World War II. However, the sulfonamides were the first antibiotic class used clinically (in the 1930's). The discovery of antibiotics revolutionized medicine by making once-deadly infections treatable. There are now hundreds of antibiotics, classified into several categories. These antibiotic classes include:
Explanation:
sana makatulong!
What do producers dictate in
an ecosystem?
A. the size of the organisms
B. the age of the organisms
C. the amount of organisms
Answer:
C. The amount of organisms
Explanation:
Producers produce food from inorganic matter, this then makes food for other organisms in an ecosystem. The amount of producers dictates how much food is available, and by that how many organisms can be present.
Why does the body respond to stimuli
Answer:
That is because of Receptors. Receptors are groups of specialised cells. They detect a change in the environment stimulus. In the nervous system this leads to an electrical impulse being made in response to the stimulus.
Hope this helped
All the best !!
The body typically responds to stimuli because of the function of the receptors.
How does the body of an organism respond to stimuli?The organism significantly responds to the stimuli by means of a number of effectors, such as muscles and glands. Energy is generally used in the process in order to facilitate an ideal function of the entire body and maintain homeostasis.
Due to this, the organisms change their behavior in response to changes in the surrounding environment. For example, an organism may move in response to its environment.
The process of responding to stimuli is generally mediated by the receptors which are the groups of specialized cells within the body. These receptors alter their physiology and function with respect to the surrounding environment and detect a change. In the nervous system, this directs to an electrical impulse being made in response to the stimulus through a chemical process.
Therefore, the body typically responds to stimuli because of the function of the receptors.
To learn more about Responding stimuli, refer to the link:
https://brainly.com/question/937756
#SPJ2
Biomagnification __________.
a.
causes a 90% loss of synergy higher on the food chain
b.
is caused by the ecological succession from a disturbed area to a climax community
c.
is introduced into an ecosystem through nonpoint pollution sources
d.
happens when an increased concentration of a substance accumulates in body tissues
e.
is the transportation of pollution from one ecosystem to another
Answer:
d :)
Explanation:
when the people swalo the gum what will happen in digestion?
Answer:
If you swallow gum, it's true that your body can't digest it. But the gum doesn't stay in your stomach. It moves relatively intact through your digestive system and is excreted in your stool.
identify the organism that is being neither harmed or helped in Finding Nemo
Answer:
Some have lifelong relationships with other organisms, called symbiotic relationships. There are three different types of symbiotic relationships: mutualism, commensalism, and parasitism. Commensalism: only one species benefits while the other is neither helped nor harmed
Southern California and Arizona have the same latitude. Arizona summers are hot while Southern California summers are mild. Why?
a.] The cool pacific current flows down from Alaska keeping Arizona mild. California is too far away from the ocean and has little effect.
b.]The warm pacific current flows down from Alaska keeping California mild. Arizona is too far away from the ocean and has little effect.
c.]none of these choices
d.]The cool pacific current flows down from Alaska keeping California mild. Arizona is too far away from the ocean and has little effect.
Answer:
the answer would be D
Explanation:
This is because Cool air goes into southern California, making the summers cooler.
How do populations and communities interact?
Answer:
An ecological community is made up of all the populations of all the different species that live together in a particular area. The interactions between different species in a community are called interspecific interactions, inter- means "between".
Which of the formed elements arise from myeloid stem cells?
a) B cells
b) natural killer cells
c) platelets
d) all of the above
Answer:
c
Explanation:
it creates platelets and a myeloblast, or monocytes
The formed elements that may arise from myeloid stem cells are platelets. Thus, the correct option is C.
How myeloid progenitor cells are formed?The myeloid progenitor cells are formed from the hematopoietic stem cells which are of multipotent nature. Such HSC cells induce the transcription factor GATA-2 and give rise to myeloid progenitor cells.
The process of hematopoiesis occurs in the bone marrow in which HSCs play a major role in synthesizing the blood cells.
The myeloid progenitor cell further produces dendritic cells through the transcription factor FLT3L, eosinophils through IL-5, mast cell, platelets through thrombopoietin, RBCs through erythropoietin, etc.
Therefore, among the given options, platelets are derived from myeloid stem cells. Thus, the correct option is C.
To learn more about Myeloid stem cells, refer to the link:
https://brainly.com/question/28028332
#SPJ6
when did the process of the earth building begin?
Answer:
4.6 billion years ago
Explanation:
Answer:
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.
Explanation:
hope it becomes helpful to you ☺️☺️
good luck
Energy Metabolism Pathways Carbohydrate metabolism is responsible for the formation, breakdown, and interconversion of carbohydrates in living organisms. The most important carbohydrate is glucose that is metabolized by all living cells in the first energy-yielding pathway known as glycolysis.
Use your knowledge of glucose for carbohydrate metabolism to select the term that best completes each sentence.
The glucose conversion to_________ opens anaerobic and aerobic metabolic pathways. ________in its role as a coenzyme during glycolysis, escorts hydrogen and electrons to the electron transport chain and the The TCA cycle. converts lactate to glucose and returns the glucose molecule to the muscles through
In the Cori cycle, the release of energy from_________ the process of anaerobic glycolysis.
Answer:
The glucose conversion to PYRUVATE opens anaerobic and aerobic metabolic pathways. VITAMIN B NIACIN in its role as a coenzyme during glycolysis, escorts hydrogen and electrons to the electron transport chain and the TCA cycle. In the Cori cycle, the release of energy from ATP converts lactate to glucose and returns the glucose molecule to the muscles through the process of Anaerobic Glycolysis.
Explanation:
In metabolism, glycolysis is defined as the splitting of the glucose molecule to form two molecules of pyruvic acid. It is the first main metabolic pathway in cellular respiration for the production of energy in form of ATP(Adenosine triphosphate).
In most cells, cellular respiration occurs in the presence of oxygen. This is known as AEROBIC RESPIRATION which produces the largest number of ATP. Energy can also be gotten by breaking down of glucose in the complete absence of oxygen. This is known as ANAEROBIC RESPIRATION.
The next stage in the degradation of glucose is a two step conversion of the two pyruvic acid molecules from glycolysis into two molecules of acetyl coenzyme A( acetyl - CoA). This occurs in the TCA( tricarboxylic acid) or Krebs cycle.
VITAMIN B NIACIN in its role as a coenzyme during glycolysis, escorts hydrogen and electrons to the electron transport chain and the TCA cycle. Coenzyme A is a derivative of vitamin B which combines with pyruvic acid to form acetyl CoA , 2 molecules of carbon dioxide and 4 molecules of hydrogen in TCA cycle.
In Cori Cycle, (which is also called Lactic acid cycle), energy released from ATP is used to convert lactate to glucose. This is to prevent increased lactic acid in the blood during anaerobic conditions in the muscles.
examples of mixed fertilizers
If R represents the dominant gene for straight hair and r represents the recessive gene for curly hair, which statement best explains how Amelia was born with curly hair?
Answer: i have no clue
Explanation: just cause i doesn’t know
what is Physiological hylogical or attitudinal barriers to communication?
Answer:
Physiological barriers to communication are related with the limitations of the human body and the human mind (memory, attention, and perception). Physiological barriers may result from individuals' personal discomfort, caused by ill-health, poor eye sight, or hearing difficulties.
Explanation:
Which of the males could be the father in the following DNA fingerprint?
O Male 1
O Male 2
O Neither
O Both
Answer:
I belive its either male 2 or both
Explanation:
In a simulation they prepared the enzyme disgestion reaction in 4 tubes A+,A-,K+ and K- .what is the difference between the + and -
Answer:
i nb u ksbhsjhs shhsbsb nsksb s
Which functions are carried out by the water vascular system? Check all that apply.
movement
reproduction
respiration
transportation of food
transportation of water
Answer:
respiration, movement, transportation of water
Explanation:
Answer:
Movement, respiration, transportation of food, and transportation of water.
Explanation:
this is correct on edge :)
What are 3 examples of dna
Explanation:
An example of DNA is the chain of basic materials in the chromosomes of the human cell.
just check the photo dont worry that is correct
Why is cellular respiration considered to be a reverse process of
photosynthesis?
Answer:
678
Explanation:
Suppose a researcher successfully produced a membrane composed of saturated triglycerides rather than from phospholipids. What characteristics would you expect the saturated triglyceride membrane to have?
A. hydrophilic molecules would easily pass through the membrane.
B. hydrophobic molecules would be attracted to the membrane.
C. the membrane would be fluid at room temperature
D. the saturated triglycerides would not form a bilayer.
Answer:
B. hydrophobic molecules would be attracted to the membrane.
D. the saturated triglycerides would not form a bilayer.
Explanation:
Triglycerides are molecules composed of a higher proportion of saturated fatty acid chains where carbons are connected by single bonds. Triglycerides are hydrophobes, i.e., they are nonpolar hydrophobic molecules. In this case, it is expected that hydrophobic molecules, including triglycerides, would be attracted through hydrophobic interactions (between water and hydrophobes). Triglycerides contribute to maintain the structure of the cell membranes by forming a lipid bilayer. Unlike phospholipids, triglycerides lack a polar group (phospholipids contain charged phosphate groups), and therefore triglycerides are unable to orient themselves in order to form a bilayer.
Dose Centipede have cells
Answer:
eveything that has organic material has cells, for example, rocks have molecules not cells
Explanation:
Considering that a hydrophilic stain was used to stain the skin, explain why the fat vacuoles in adipocytes are white (Hint: Remember hydrophilic will color those areas that "like water", think about water`s relationship with fats).
Answer:
The hydrophilic nature of the stain explains that these molecules are polar and charge molecules. therefore, attracts the water molecule but due to their polar nature, it will avoid lipid or fat molecules.
Adipocytes are the cells that are made up of fat or lipids that are hydrophobic due to their non-polar nature and due to this fact, these hydrophilic stains will not be able to stain adipocytes and will not be colored by the stain.
Imagine the Earth did not spin. How would this affect your life?
Answer:
no sunlight like hitler
Answer:
well, you wouldnt really sleep because the sun would be out all day and if you stay up, it can negatively effect your lifestyle
Explanation: hope this helps
how does a crab moves,and why
Answer:
Most crabs usually stroll on the beach by walking sideways. But crabs can also walk forward, backward and diagonally. Because crabs have stiff, jointed legs, they move faster and easier walking sideways. ... A crab walking sideways pulls itself along with one set of legs and pushes with the other.
By studying footprints, skin prints and feather prints, many paleontologists now believe dinosaurs are most
closely related to
A reptiles
B. amphibians
C. mammals
D. birds
Homer Simpson loves to garden and wants to grow lots of pink flowers for his pal Moe. He bought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day. The one without sun dies while the one with sun grows. 6. What is Homer's Independent Variable in the experiment? 7. What is the Dependent Variable in his experiment? 8. What is one constant you can identify in this experiment? 9. What is one error that could have occurred in this experiment? 10. What is one thing Homer could do to improve this experiment to test if the Flower Power fertilizer really worked? 11. What conclusion can Homer make about the Flower Power fertilizer?
Answer:
Oh HoMeY.............
Which direction does blood flow in arteries?
(a) Which two cell components are copied before the muscle cells start to divide?
Answer:
DNA is copied in a process called DNA replication
Explanation:
This results in two identical chromosomes instead of just one.
Are virus mutations always bad? Why or why not?
Answer:
yes, because more people can get effected and some may be asymptomatic and not know they have it and get someone else effected.
Explanation:
how would you compare the fitness of the white mice with that of black mice
Answer:
id say its most likely the same
True or false? Energy losses from food animals such as pigs can be reduced by reducing the temperature of their enclosure
Whoever gets this right in less than 2 mins, I will mark as Brainiest
Answer:
true.....
please mark me as a brainliest........
