A scientist associated with antibiotics is

Answers

Answer 1

Answer:

The modern medical era began when an absent-minded British scientist named Alexander Fleming returned from vacation to find that one of the petri dishes he forgot to put away was covered in a bacteria-killing mold. He had discovered penicillin, the world's first antibiotic.


Related Questions

Cell walls are only found in animal cells.

Answers

Answer:

False

Explanation:

Animal cells do not have a cell wall

Answer:

i think so yes beacuse i remember it that i read in in science

Identify one
food chain in
this food
web.

Answers

Answer:

Duckweed, Duck, Fox

Explanation:

Any combination that starts with a producer and ends in a consumer in order of consumption.

Other examples are :

Algae, water snail, duck, fox

List the features of the gaseous exchange surface in humans.​

Answers

they give the lungs a really big surface area
they have moist, thin walls (just one cell thick)
they have a lot of tiny blood vessels called capillaries

Answer:  

they give the lungs a really big surface area.

they have moist, thin walls (just one cell thick)

they have a lot of tiny blood vessels called capillaries.

Hopes this helps :D

questions.
Questions
1 a Name the microorganism which causes the disease smallpox.

Answers

Answer: Variola Virus

Explanation:

nuclear envelope reappears

spindle dissolves

chromosomes uncoil

These processes occur during

telophase.

prophase.

anaphase.

metaphase.

Answers

Answer:

D). Telophase

Explanation:

1. Give four (4) importance of “wind”?

2. How and when is the sun harmful to plants and animals/humans?

3. Why do you think the son is very important to plants?

4. Explain or give the importance of the sun in relation with the weather of any place on planet earth?

Answers

Answer:

1. Wind is an important element when it comes to current weather and predicting future forecasts. Wind transports moisture and temperature from one area to another, therefore weather conditions change with the shift of wind direction.

2.All plants and animals, including humans, are exposed to the dangers of solar UV radiation; it can cause significant damage to plants, as seen in crop yield reduction and leaf burn, and can damage animal skin health.

3.sun-light is a key energy source for all plants. Through a process called photosynthesis, plants absorb energy from the sun, which fuels the processes necessary for survival.

4.The Sun warms our planet, heating the surface, the oceans and the atmosphere. This energy to the atmosphere is one of the primary drivers our weather. Our climate is also strongly affected by the amount of solar radiation received at Earth.

Explanation:

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which of the following is an artificial
hormone
PAA
IBA
NAA
ALL OF THESE



pls...help Mee with the correct answer​

Answers

The is is going to be A PAA

Why does neurones contain many mitochondria and many ribosomes?

Answers

Answer:

Neurons depend on mitochondria. ATP generation by mitochondrial respiration in the brain consumes 20% of the body's oxygen although the brain is only 2% of the mass of the body (Attwell and Laughlin, 2001). ... Every part of the neuron requires ATP and therefore requires mitochondria to be present.The dendritic processes and spines of neurons are essentially expansions of cytoplasm containing most of the organelles found in the cell body. ... Rough endoplasmic reticulum and ribosomes are present in large but not small dendrites.

The neurones contain many mitochondria and many ribosomes as neurons depend on mitochondria. ATP generation by mitochondrial respiration in the brain consumes 20% of the body's oxygen although the brain is only 2% of the mass of the body.

What are neurons?

The neurones contain many mitochondria and many ribosomes as neurons depend on mitochondria. ATP generation by mitochondrial respiration in the brain consumes 20% of the body's oxygen although the brain is only 2% of the mass of the body.

Every part of the neuron requires ATP and therefore requires mitochondria to be present.The dendritic processes and spines of neurons are essentially expansions of cytoplasm containing most of the organelles found in the cell body. Rough endoplasmic reticulum and ribosomes are present in large but not small dendrites.

The outermost part of brain has been known as Dura mater which has been consist of a strong membrane layering and it has been thick located just beneath the skull and vertebral column.

Therefore, the neurones contain many mitochondria and many ribosomes as neurons depend on mitochondria. ATP generation by mitochondrial respiration in the brain consumes 20% of the body's oxygen although the brain is only 2% of the mass of the body.

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help help help help help

Answers

Answer:

D. There is a warm front coming from the south.

15 POINTS!!!! At a molecular level, does plasma have more or less energy than other states of matter?

Answers

Answer: Hello!

Plasma is more energetic than other states of matter.

Explaination:

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1. describe the stages of the cell cycle
2. use a model to illustrate the role of cellular division in the formation of new cells
3. describe the structure of a chromosome
4. follow chromosomes through the processes of mitosis and cytokinesis

Answers

Answer:

1.The cell cycle, or cell-division cycle, is the series of events that take place in a cell that cause it to divide into two daughter cells.

2. In the Picture Linked.

3. Chromosome help ensure that DNA is replicated and distributed appropriately during cell division. Each chromosome has a centromere, which divides the chromosome into two sections – the p (short) arm and the q (long) arm.

4. Mitosis occurs at the sites of growth and development of new tissues.      Here are the stage of mitosis Below:

Prophase

This is the initial phase. The chromosomes in the nucleus become visible as thin coiled threads. In animals, the centrosome found in the cytoplasm divides to form two centrioles. The chromosomes become tightly coiled and shorter. From each centriole, fine fibers develop and elongate to form spindle apparatus. The nucleolus becomes dispersed in the nucleus and disappears. The nuclear membrane also break and disappears.

Metaphase

The pairs of chromatids align along the equator of the spindle apparatus and are attached to it at their centromeres.

Anaphase

The centromere of each chromosome splits and the chromatids separate. Each chromatid moves to the opposite poles of the cell. The chromatids appear as V--shaped.

Telophase

The spindle fibers disintegrate and disappear. New nuclear membrane forma around each set of chromatids. A nucleolus develops in the nucleus of each daughter cell. The cytoplasm now divides in a process called cytokinesis. In animals, an invagination develops at the plasmalemma near the equator of the cell.

Relationship between mitosis and cytokinesis:

Mitosis is the division of a nucleus. Cytokinesis is the division of the cytoplasm. If mitosis occurred without cytokinesis, the cell would contain two nuclei and twice the DNA. If cytokinesis occurred without mitosis , one of the new cells would lack DNA and a nucleus altogether.

in what situation can a harmful deletion in a chromosome persist in a population?

Answers

Answer:

If the homologous chromosome lacks the deletion

4. Which statement best expresses a basic scientific
assumption?
A Interpretation of experimental results has
provided explanations for all natural phenomena.
B) Ifa conclusion is valid, similar investigations by
other scientists should result in the same
conclusion.
C) For any conclusion to be valid, the design of the
experiment requires that only two groups be
compared
D) After a scientist formulates a conclusion based
on an experiment, no further investigation is
necessary
3

Answers

Answer:

Choose B) B) If conclusion is valid, similar investigations by

other scientists should result in the same

conclusion.

Explanation:

identify the small facial bones found in the medial wall of the orbit.

Answers

Answer:

Lacrimal

Explanation:

cuál es la fuente de conocimiento de la astrología? la observación de la naturaleza? los libros?

Answers

Answer: c

Explanation: trust

testosterone, a lipid-soluble signaling molecule, crosses the membranes of cells throughout the body but affects only target cells because __________.

Answers

Answer:

of intracellular receptors

Explanation:

this should be correct

which structures are found in palisade cells and liver cells

Answers

Answer:

All cells contain a nucleus and a nuclear envelope and the liver cell is no exception. It has exactly the same control over the cell as the palisade nucleus does. To keep it all together, it is surrounded by a cell membrane.

Explanation:

Since a liver cell is an animal cell, it lacks chloroplast. Below the epidermis of the leaves is a palisade cell. It participates actively in photosynthesis, chloroplasts are present.

What structures are found in liver cells?

Liver cells lack a cell wall but do have a nucleus and a cell membrane. It receives blood from two main sources: The Hepatic Portal Vein, which delivers blood from the digestive tract that is nutrient-rich.

The nucleus and nuclear envelope are components of every cell, including liver cells. The cell is under the exact same management that the palisade nucleus is. It is encased in a cell membrane, which serves to keep everything together.

Therefore, as an animal cell, the liver lacks the cell wall, chloroplast, and big vacuole that are often seen in plant cells.

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What is the most venomous snake in the world? Please help ASAP! Help would be appreciated. I will give Brainliest!
Note: it's my homework! :)

Answers

The most venomous snake in the world is Inland Taipan.

Answer: Oxyuranus microlepidotus, also called the fierce snake

Explanation: The snake with the most deadly venom.

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What has very thin walls to allow the nutrients and gasses to be exchanged between the blood and cells?
ОООО
Arterioles
Venules
Veins
Capillaries

Answers

Answer:

Arterioles

Explanation:

Arterioles are considered as the primary resistance vessels as they distribute blood flow into capillary beds. Arterioles provide approximately 80% of the total resistance to blood flow through the body.

what organelle is critical for endocytosis and exocytosis to occur

Answers

Answer:

Endoplasmic Reticulum

Explanation:

The cell membrane, also known as the plasma membrane, is an organelle that is essential for both endocytosis and exocytosis to take place.

Thus, The cell membrane, which encloses the cell and separates its internal contents from the outside environment, is a barrier that is selectively permeable.

The process by which cells absorb materials from their surroundings is known as endocytosis. The cell membrane invaginates and creates a vesicle that encloses the substance being transported into the cell during endocytosis.

The vesicle is subsequently taken inside and moved into the cytoplasm of the cell. In this process, the cell membrane is essential because it helps the endocytic vesicle develop.

Thus, The cell membrane, also known as the plasma membrane, is an organelle that is essential for both endocytosis and exocytosis to take place.

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Give an example of a 1) solid, 2) liquid and 3 gas.

Answers

1) Rock

2.) Acid

3.) Helium

I hope this is what you wanted

1. Brick

2. Water

3. Lava

a biology teacher shows the class pictures taken while using different microscopes. the plant cells have visible chloroplasts, and a sample of human cheek cells shows a nucleus and a cell membrane. what type of microscope was used for these pictures?

Answers

If a biology teacher shows the class pictures where plant cells have visible chloroplasts human cheek cells show a nucleus and a cell membrane. then the type of microscope that was used is an optical microscope.

What is an optical microscope?

An optical microscope is a device that contains different magnification lens that allows for increasing the size of the image. These lens include ocular and objective lens.

In conclusion, an optical microscope can be used to observe microscopic substructures  such as chloroplasts in plant cells or the cell nucleus in human cells, which depend on the magnification of the image (cell nucleus: 1000 X).

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Which s an example of why the process of photosynthesis is important to life on Earth?

Answers

Explanation:

Thanks to photosynthesis, us and many other animals can have oxygen! That's because when plants photosynthesize, they take in carbon dioxide, and the waste is oxygen, which a lot of things need to survive.

bone growth in which the bone increases in diameter is called

Answers

Appositional growth is the term for the rise in diameter. The periosteum's osteoblasts build compact bone around the exterior bone surface.

What are things that sound waves can travel through?

Answers

Answer:

Sound waves are longitudinal waves. They need a medium to travel through. They cause particles of the medium to vibrate parallel to the direction of wave travel. The vibrations can travel through Solids, Liquids or Gases.

Explanation:

Hope it helps

nerve fibers scattered throughout the dermis are associated with

Answers

Answer:

muscles, glands, and sensory receptors

Explanation:

The dermis is composed largely of: dense irregular connective tissue. Nerve fibers scattered throughout the dermis are associated with: muscles, glands, and sensory receptors. Which of the following is not correct concerning the skin? The subcutaneous layer is between the dermis and the epidermis.

Hair samples can provide information on all of the following EXCEPT.....

a
Age
b
Gender (sex)
c
Race
d
Hair samples can provide information on all of these.

Answers

Answer:

the answer should be A) Age

Cereal crops - eg simple question free

Answers

Answer:

Important cereals are wheat, rice, maize, oat, barley, rye, millet and sorghum.

Answer:

Explanation:

some cereals are wheat, rice, maize, oat, barley, rye, millet and sorghum.

How do muscle cells access what they need to keep producing energy

Answers

Muscle cells access what they need to continue producing energy through chemical energy from ATP to transform it into mechanical energy.  

Muscle cells are elongated cells whose length can reach several centimeters.  

The muscle uses ATP (energy) to carry out conformational changes in its molecular structure => variation in the length of the sarcomere.  

Adenosine triphosphate (ATP) is the basic source of energy for muscle contraction.  

Each link stores 7300 calories of energy per mole of ATP under normal conditions and when a phosphate radical is separated from the molecule, these calories are available providing the energy necessary for muscle contraction.  

The muscle cell has three mechanisms to resynthesize ATP:  

ATP synthesis through phosphocreatine.  

Anaerobic glycolysis process with the transformation of muscle glycogen into lactate.  

From oxidative phosphorylation.  

ATP synthesis through phosphocreatine consists of the transfer of energy from phosphocreatine to ADP so that it can reincorporate a phosphate group to its molecule and transform it into ATP.

So the energy that has been released in the hydrolysis of PCr is directly used to resynthesize ATP from ADP.  

Therefore, we can conclude that muscle cells access what they need to continue producing energy through the chemical energy of ATP to transform it into mechanical energy.  

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Describe how the structure of an atom determines it's function. How is the structure of
an atom related to the properties A displays when bonding or reacting with other
atomslelements. Provide a simple example,

Answers

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain electrons (negatively charged).

Explanation:

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Assume you have applied for two Scholarships, a merit scholarship And is athletic scholarship the probability that you receive an athletic scholarship is 0.8. The probability of receiving both scholarships is 0.11. The probability of getting at least one of the scholarships is 0.3 BRAINLIEST ASAPLee el prrafo y despus escoge la frase que contiene el uso incorrecto de ser o estar. Read the paragraph and then choose the sentence that contains the incorrect use of the verb ser or estar.Colombia es un pas hermoso. Es en Amrica del Sur. Hay ciudades increbles como Barranquilla y Medelln. Tambin es un pas con mucha naturaleza. Puedes andar en las montaas e ir a la playa en el mismo da. Cada ao hay un carnaval muy tradicional en Bogot, la capital del pas. No es grande como el de Barranquilla, pero celebra la independencia del pas y fue el primer carnaval en Colombia. Colombia es un pas hermoso. No es grande como el de Barranquilla Tambin es un pas con mucha naturaleza. Es en Amrica del Sur. A basketball player throws a ball horizontally toward another player 10 meters away. If the ball istraveling at a speed of 20 m/s, neglecting air friction, how long does it take for the ball to get to theother player?Thank you!!! One of the main factors contributing to the establishment of feudalism in WesternEurope was the -will to establish religious uniformityO inability of kings to effectively defend their landsneed to centralize political powerdesire to maintain an educated citizenry Write ONE tone and theme from ""My mother pieced quilts"" "Instead of keeping senior citizens in elderly homes, it is better to care them at home." justify the statement. someone plz help plz The value of c varies directly with y, and when x=1/3, y=5 Write an equation to represent the direct variationFind the value of y if x=-2 PLS HELP Find the missing dimension of the prism. Volume = 532 in. 3 19 in ?11.9 cm9.1 cm-oblemTwo side lengths of a triangle are shown above. What could be the measurement of the missing side length? (choose 2)A 20.3 cmB22.4 cmC 2.6 cmD14.6 cmE 25 cm Which of the following is not an example of a digital transaction?A. You receive points for making purchases with a credit card.B. You receive a check for walking the neighbor's dog.C. Your aunt sends you an email with a gift card.D. Your friend transfers money from her phone to yours to repay adebt. Directions: Read the short story then answer the question."U.S. Authorities Escort Family To Airport"Yousef said Issa's team arranged a time for his family to go to the airport with an escort from U.S. authorities. He described talking to Issa's team from where he was in California. At the same time, he was navigating his family through the chaos in Afghanistan.His family returned home to California on Friday, September 3. The first thing he did was take them to IHOP, the International House of Pancakes. It's their favorite restaurant.He hopes more of those happy moments will wipe away the deeply distressing memories his kids have. His 7-year-old son, his youngest, has been talking about the violence."They are talking about it, about the gunfire, and being scared of the Taliban, but we hope they forget all that," said Yousef. He wants them to return to their lives as regular American kids.Questions:1. What was the first thing Yousef and his family did when they made it home to California?2. Why was doing that important to Yousef? the chromosomes line up in the center of the cell during which phase of mitosis? please someone helpppppp im giving brainliest! Express 15 3/5 as a fraction in simplest form Someone help me with this I will make you brain How did colonists react to the Stamp Act?A. They immediately declared independence and fought against the British.B. Colonists sent messages to Parliament, refused to buy stamps, attacked tax collectors.C. Colonists called The Stamp Act necessary.D. Colonists accepted it since the tax was so small. A rectangular farm has an area of 5/8 square miles. If its length is 1/9 miles, what is its width? Do you think you'll support the same political party as your family? On the following unit circle, theta is in radians and tan ( ) = 0.99 0.1 = 9.9 tan()= 0.1 0.99 =9.9tangent, left parenthesis, theta, right parenthesis, equals, start fraction, minus, 0, point, 99, divided by, 0, point, 1, end fraction, equals, minus, 9, point, 9. y y x x 1 1 1 1 1 1 1 1 ( 0.1 , 0.99 ) (0.1,0.99) A unit circle with an angle from the positive x-axis to a ray labeled theta. The point where the ray intersects the circle is labeled 0.1, negative 0.99 and is in the fourth quadrant. Without a calculator, evaluate the following expressions to the nearest