What are S-strain and R-strain bacteria?

Answers

Answer 1

Answer:

When Frederick Griffith discovered two strains of Streptococci in 1923, the bacteriologists were intrigued by the differences between them: the S (smooth) strain, which produces colonies that are smooth and shiny on a lab plate; the R (rough) strain, which lacks a polysaccharide coat and produces colonies that are rough and irregular on a lab plate.

Explanation:


Related Questions

whats one difference between the ways aristotle and theophrastos classified plants?

Answers

Answer:

Aristotle classified animals based on where they lived, while Linnaeus instead used an animal's morphology, evidence from both fossil records and living organisms.

is there a nutritional difference in brown and white eggs

Answers

Answer:

there is no significant difference in nutrients between brown and white eggs.

below is a view at 1000x magnification of a gram stain of the cerebrospinal fluid. what type of white blood cell predominates in charlie’s csf?

Answers

The type of white blood cell that predominated in charlie's CSF is neutrophils.

Cerebrospinal fluid (CSF) is a transparent, colorless plasma ultrafiltrate with little protein and few cells. It is produced in the choroid plexus in the ventricular brain system.

The type of white blood cell that predominated in charlie's CSF is neutrophils. They are granular leucocytes, with active phagocytes. In the cytoplasm, there is the presence of neutral staining granules whose phagocytic activities are integral to subdue the invasion of pathogens.

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4. What are the four components of the Earth system?

Answers

Lithosphere (land), hydrosphere (water), biosphere (living things), and atmosphere (air)

During the development of skeletal muscle cells, some myoblasts do not fuse and instead become ______ cells.

Answers

Answer:

It would become satellite

a human red blood cell is placed in a solution whose solute concentration is twice as great as the concentration of the cell cytoplasm. The cell membrane is selectively permeable allowing water but not the solutes to pass through. What will happen to the cell? a.) No change b.) the cell will shrivel because of osmosis c.) the cell will swell because of osmosis d.) the cell will shrivel because of active transport of water e.) the cell will swell because of active transport of water

Answers

Answer:

the cell will shrivel because of osmosis, moving to the region of higher concentration, and it shrivels due lost of water

B is the correct thing. The water molecules with the cell with move to hypertonic solution until an equilibrium is reach . But in this case solute concentration is twice that of the red blood cell therefore the protoplasm of the red blood cell will move further away from cell. Hence the process called crenation (shrivel )

Mutations in proto-oncogenes are generally _____ whereas mutations in tumor-suppressor alleles are generally _____.

Answers

Answer:

mutations in proto-oncogene are generally cancerous while mutation in tumor-suppressor alleles are recessive and result lost of function

Who discovered mercury and what is your source?

Answers

Answer: Sumerians

Explanation: www.whodiscoveredit.com/who-discovered-mercury.html  

Answer:

Galileo Galilei first discovered mercury my source https://www.nhm.ac.uk/discover/planet-mercury.html#:~:text=Mercury%20is%20one%20of%20the,Galileo%20Galilei%20and%20Thomas%20Harriot.    that link

Explanation:

Hope di helps

Enzymes transferring electrons at the start of the ETS are referred to as ________, whereas enzymes transferring electrons to the terminal electron acceptor are designated as ________.Question 40 options:a) sulfatases; nitrogenasesb) lyases; hydrolasesc) permeases; proton pumpsd) dehydrogenases; oxidasese) oxidases; dehydrogenases

Answers

Answer:

dehydrogenases; oxidases

Explanation:

is SARS a common virus?

Answers

Answer: SARS is not a common virus,  it is a viral respiratory illness that was recognized as a global threat. it is spread through close contact. Although it is a very serious illness, it is rare to get. only eight persons were laboratory-confirmed as SARS cases.

Explanation:

Some single-celled organisms make copies of themselves through mitosis. Which describes the function of the cell cycle in such single-celled organisms?

Answers

Answer:

In unicellular organisms such as bacteria, mitosis is a type of asexual reproduction, making identical copies of a single cell.

Explanation:

Unicellular organisms are asexual which means they don"t need partners.

Which aquatic ecosystem is often compared to a tropical rain forest why?

Answers

Answer:

Coral reefs is the answer.

Explanation:

Coral reefs are often called the "tropical rainforests of the sea" for their astounding richness of life. Due to their structural complexity, corals are one of the most productive ecosystems on Earth, providing important services to mankind including fisheries, coastal protection, medicines, recreation, and tourism.

Source: Internet

What percentage of body water loss can impact athletic performance?

Answers

Exercise performance begins to decline once water loss exceeds 2% of an individual's body mass.

What are the three general classes of neurons that correspond to the three major aspects of nervous system function

Answers

Answer:
Sensory neurons, motor neurons, and interneurons.

how many feet of intestines does the average person have

Answers

Research suggest that the combined length of the small and large intestines is at least 15 ft in length. The small intestine can measure about 9-16 ft while the large intestine is roughly 5ft long.

How are glucose and ethanol similar in structure and function?

Answers

Answer:

Ethanol fermentation, also called alcoholic fermentation, is a biological process which converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as by-products...

Explanation:

Ethanol fermentation, also called alcoholic fermentation, is a biological process which converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as by-products.

what is the difference between ribose and deoxyribose

Answers

Answer: Ribose is a pentose sugar and is found in DNA. Ribose binds a phosphate at the 3′ position

Ribose is a 5-carbon simple sugar. The chemical formula of this sugar molecule is H−(C=O)−(CHOH)4−H. This is the prime component of ribonucleic acid strands. It forms ribonucleotides.


Deoxyribose is a hexose sugar and is found in RNA. Deoxyribose binds a phosphate at the 2′ position. deoxyribose has one less oxygen molecule than ribose.

Deoxyribose, on the other hand, is a monosaccharide too. It also has the same 5-carbon formula as that of ribose sugar but loses an oxygen atom. Its chemical formula is H−(C=O)−(CH2)−(CHOH)3−H

Plz answer this question: Read the passage and examine the photos. Then, suggest two reasons that scientists think developing pollen grains made vascular plants the most successful plants that live on land.

Answers

Answer:

Vascular plants are successful due to better transportation for water, nutrients and reproduction.

The xylem and phloem of the vascular bundles allow for distribution of water and food to all parts of the body.

The process of making sugars in the chloroplast is called??

Answers

Answer:

Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells. ... The entire process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast.

As the troponin changes shape (due to binding calcium), it moves the ______ molecule to which it is attached, thus exposing the active sites on the G-actin molecules.

Answers

As the troponin changes shape (due to binding calcium), it moves the tropomysin molecule to which it is attached.

Once calcium binds to troponin and causes it to change it shape, it removes the tropomysin away from the binding site therefore effectively exposing the myosin binding sites.

This occurs during muscle contraction (movement) in the skeletal muscles.

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Answer: tropomyosin

Explanation: just took a quiz :)

Help me with this please

Answers

Answer:

4.Red

5. gamma waves

5. Gamma waves

Explanation:

if you look at the visible light they label all the colors for you red is at the end closest to increasing wavelength

When salt water i added to a plant cell why does the cell membrane srink

Answers

If a higher concentration of salt is placed outside of the cell membrane, the water will leave the cell to bond with it. The loss of water from this movement causes plant cells to shrink and wilt.

on what basis are populations assigned to the same biological species?

Answers

Answer: On What Basis Are Populations Assigned To The Same Biological Species? Answer A Very Similar Appearance Being Able To Interbreed And Produce Fertile Offspring Relating To The Environment In The Same Way Sharing A Common Ancestor Having 99% Of Their Genes In Common

Two brothers have thick hair that grows over their faces and most of their bodies.
This human disorder, called Ambra's Syndrome, shows X-linked dominant inheritance. The
mother of the boys is also affected by Ambra's Syndrome, although her excessive hair growth
occurs in various, scattered patches on her skin rather than a continuous coverage like her sons.
What is the most likely explanation for the patchy expression of hairlessness on the mother's
skin?

Answers

The most likely explanation for the irregular expression of hairlessness on the mother's skin is codominance

Codominance is a biological term to refer to the hereditary pattern that is characterized by:

In the heterozygous state, there is no recessive allele, but both behave as dominant. Codominance is characterized by the manifestation of both characteristics as dominant, without mixing.

According to the above, the irregular expression of the lack of hair in the mother is a manifestation of the codominance of the hair gene and the hairless gene that do not mix but are seen independently.

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What is the surgery that involves trimming excess prostate tissue in order to treat urinary problems that are caused by an enlarged prostate?

Answers

Answer:

d. TURP is correct

Explanation: Transurethral resection of the prostate

Answer: D) Turp


hope this helps

Which of the following statements would correct one of the roles listed in the table?

Answers

Answer:

Glucose combines with water to form carbon dioxide.

Explanation:

Glucose combines with water to form carbon dioxide.

Plants do not eat, how do they carry out the process of nutrition?

Answers

Plants absorb nutrients and water through their roots, but photosynthesis — the process by which plants create their fuel — occurs in the leaves. The leaves of plants also contain veins, through which nutrients and hormones travel to reach the cells throughout the leaf.

Under the hypothesis of blending inheritance, what color(s) would the offspring of a black cat and a white cat be

Answers

Under the hypothesis of blending inheritance, the offspring of a black cat and a white cat would be GREY.  This theory is not now accepted.

Blending inheritance is an erroneous theory from the 19th century that proposed that offspring inherit phenotypic traits as 'average values' observed for such traits in their parents.

Mendel's laws of heredity (i.e., the Law of Segregation and the Law of Independent Assortment) showed that blending inheritance is based on erroneous concepts.

Moreover, incomplete dominance is an inheritance pattern different from blending inheritance because incomplete dominance refers to the observation that in certain traits both gene variants or 'alleles' are expressed in heterozygous individuals.

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Which of the following does not directly cause erosion?
O Ice
OLichen
ОSun light
oChemicals

Answers

Answer:

a ice

Explanation:

ice doesnt cause erosion directly

It’s either ice or chemicals


1. Describe how chemical changes
are
different from physical changes.

Answers

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Explanation:

Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. In a chemical change, the kind of matter changes, and at least one new substance with new properties is formed.

Explanation:

Physical changes are limited to changes that result in a difference in the display without changing the composition.

hope that helped!

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