Answer:
antibodies
Explanation:
Antibodies are soluble mediators of the immune system.
They are also known as immunoglobulins and are bifunctional molecules.
They consist of polypeptide chains with an antigen binding site and a site that carries out the biological activity of the molecule.
Antibodies are expressed on the cell surface of B cells. When these B cells are stimulated by antigen, they differentiate into antibody-secreting plasma cells. The antibodies secreted then serve as effector molecules for cells functioning in the innate and/or adaptive immune systems.
For example, particular antibodies trigger the activation of the classic complement pathway.
Which comic book featured the first appearance of iron man?
I think it is in Tales of Suspense #39 that the cover dated March 1963. May 1968 Iron Man #1 received its own title.
Answer:
the comic book was called Tales of Suspense #39
Urinary tract infections are commonly caused by Staphylococcus saprophyticus and Escherichia coli, less commonly caused by Proteus mirabilis. You have a mixed culture of these pathogens, which you inoculate onto both MacConkey agar and nutrient agar, and then you incubate the plates at optimal growth conditions. On the MacConkey agar, E. coli appears pink, P. mirabilis appears colorless, and S. saprophyticus does not grow. All three microorganisms appear cream on the nutrient agar plate. What is the best explanation for this data?A. MacConkey agar is a selective medium whereas nutrient agar is a differential medium.
B. MacConkey is both a differential and a selective medium.
C. Nutrient agar is both a selective and differential medium.
D. MacConkey agar is a differential medium, whereas nutrient agar is a selective medium.
Answer:
B. MacConkey is both a differential and a selective medium.
Explanation:
Selective media contain the ingredients that allows for the growing of specific microbes while inhibiting the others.
For example MacConkey media facilitate the growth of gram negative bacteria and inhibit the growth of gram positive bacteria. That why E. coli and P. mirabilis grew on the media because these are gram negative and S. saprophyticus does not grew being gram positive.
Differential media allow to differentiate between selected microbes by visual observation.
For Example MacConkey media differentiate between organisms that can ferment lactose to the organisms that can't ferment it. That why E. coli appeared pink on the media because it can ferment lactose while P. mirabilis appears colorless because it usually cannot ferment lactose.
Final answer:
MacConkey agar is both selective and differential because it inhibits gram-positive bacteria and distinguishes between lactose fermenters and non-fermenters, while nutrient agar is neither selective nor differential, and supports the growth of a wide variety of bacteria. So the correct option is B.
Explanation:
The best explanation for the data where E. coli appears pink and P. mirabilis appears colorless on MacConkey agar, while S. saprophyticus does not grow, and all three microorganisms appear cream on the nutrient agar plate is option B: MacConkey is both a differential and a selective medium.
MacConkey agar contains bile salts and crystal violet, which inhibit the growth of many gram-positive bacteria and favor the growth of gram-negative bacteria, making it selective. As for its differential property, the agar includes lactose and a pH indicator that identifies lactose fermenters by turning pink due to the acidic by-products of fermentation, while non-fermenters remain colorless.
In contrast, nutrient agar is neither selective nor differential. It supports the growth of a wide range of bacteria without distinguishing between different types or species, which is why all three organisms appear cream-colored on this medium.
Match the following vocabulary words with their definitions. 1. The belief that life started and has progressed solely by natural chemical processes interrelated 2. Qualities of your body that you get (genetically) from your parents DNA 3. Twisted strand of molecules in a cell nucleus containing genes and hereditary information heredity 4. Any number of items, functions or purposes which are dependent upon each other function 5. The purpose or job evolution
Explanation:
Evolution is how a species changes over many generations. A species is all the animals of one particular kind, like cats or turtles. Members of the same species can have babies with each other. A species evolves when parents pass down helpful traits to their children. A trait is anything about the animal. For example, some cats have long hair and some cats have short hair. When cats with long hair have babies, their babies also have long hair. Heredity alludes to the hereditary legacy went somewhere around our natural guardians. It's the reason we appear as though them! All the more explicitly, it is the transmission of characteristics starting with one age then onto the next.DNA stands for deoxyribonucleic acid. In eukaryotic organisms, such as animals, plants, and fungi, the DNA is stored inside the cell nucleus and in the chromosomes. Prokaryotes (bacteria) store their DNA only in the cytoplasm within their cells. This master molecule, the DNA, is the perfect hiding place for biological or genetic information.Any number of items, functions or purposes which are dependent upon each other function are interrelated to each otherThe purpose of evolution is known as the function
I believe the answer is "B". Please correct me.
Which list below describes a possible path of rain through the water cycle?
Select one:
a. Evaporation, condensation, precipitation, runoff
b. Runoff, ocean storage, evaporation, condensation
c. Transpiration, condensation, precipitation, runoff
d. Evaporation, precipitation, runoff, lake storage
Answer: The only logical correct answer is "B".
Explanation: Given the fact that the question asks for the path of rain. Rain = Precipitation, thereofer being step 1.
After precipitation (given on the question) the logical path would be to: become a runoff after it rains, then it somehow ends up at the ocean which becomes stored until it evaporates, and condensates again. after this the cycle starts again.
Endosymbiotsis can best be described as Question 1 options: how a multicellular organism uses cell division to grow one organism living completely inside another organism two organisms occupying the same type of environment many cells of one type of organism living closely together
Answer:
Endosymbiosis can best be described as one organism living completely inside another organism.
Explanation:
Endosymbiosis is referred to a mutually beneficial relationship between two organisms where one organism lives completely inside another organism. The organism which lives inside another one is known as an endosymbiont.
According to the endosymbiotic theory, all eukaryotic cells are evolved from early prokaryotes. Eukaryotes engulf prokaryotic cells capable of aerobic respiration by phagocytosis. The engulfed prokaryotic cells remain undigested and contribute new functionality such as energy production, photosynthesis, etc to the host cell. Eventually, the engulfed cell became an organelle. The organelles such as mitochondria and chloroplasts in eukaryotic cells are considered to have arisen through endosymbiosis.
One example of endosymbiosis includes the relationship between legumes and nitrogen-fixing bacteria (endosymbiont) that live in the root nodules of legumes. The nitrogen-fixing bacteria helps the plants to absorb nitrogen from the soil and plants provide food for the bacteria. The other examples include the relationship between termites and the microorganisms in its gut, single-cell algae living inside corals, etc.