Answer:
The fact that only cells are able to produce more cells is part of cell theory. The idea that organisms can develop independently of cells is called spontaneous generation, and it isn't supported by cell theory. Spontaneous generation suggests that living organisms develop from non-living matter.
Which of these organisms does NOT produce an enterotoxin?
a. Shigella spp.
b. Clostridium botulinum.
c. Vibrio cholerae.
d. Staphylococcus aureus.
Answer:
b. Clostridium botulinum.
Explanation:
The enterotoxins (also know as exotoxins when they are produced by bacteria) are polypeptides secreted by microorganisms that target the intestine. These toxins may produce serious damage to the host by disrupting the function of the epithelial intestinal cells Moreover, Clostridium botulinum is a Gram-positive bacterium that is able to produce a potent neurotoxin (botulinum) which is known to cause severe flaccid paralytic deformities in humans.
The organism that does NOT produce an enterotoxin among the options given is b) Clostridium botulinum. Clostridium botulinum is a bacterium known for producing botulinum toxin, which is a neurotoxin rather than an enterotoxin. It does not, however, create an enterotoxin.
The severe sickness known as botulism is brought on by the botulinum toxin, which predominantly affects the nervous system.
Although enterotoxins can induce diarrheal disorders and are linked to gastrointestinal symptoms, an organism need not produce an enterotoxin to be pathogenic. The host's sensitivity to infection and the infectious dosage are other important variables.
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4. What are the only prokaryotes?
Answer:
Bacteria is the only prokaryotes.
Some cynobacteria are also included in prokaryotes.
Help me plz !!!! A cat that weighs 55 N sits on the top of a cat tree. It is 2 m above a 110 N
dog. How does the mass of the animals relate to the force of gravity on
them?
O A. The mass of the 55 N cat is greater than the mass of the 110 N
dog.
B. The 55 N cat has less mass than the 110 N dog.
C. The 55 N cat has the same mass as the 110 N dog when it is in
the cat tree.
O D. The mass of the 55 N cat will be the same as the mass of the 110
N dog after it jumps to the ground.
Answer:
B. The 55 N cat has less mass than the 110 N dog.
Explanation:
Weight of an object refers to the product of its mass and the force of gravity. However, the greater that mass of an object, the greater the weight of that object.
In this case, the cat's weight is 55N while the dog's weight is 110N. This means that the dog has a greater mass than the cat or alternatively put, the 55 N cat has less mass than the 110 N dog.
Note that: if the gravitational effect is removed, the cat will contain lesser mass.
Answer:
B
Explanation:
Why would specimens viewed with a compound microscope be thin and/or chemically cleared?
Answer:
A specimen has to be thin so that the light coming from the light source is able to pass through the specimen Specimens are sometimes stained with dyes so that they are easier to distinguish and find.
Explanation:
Sorry it took some time but i hope it helps!!
The molecule pictured below produced a blue color when tested with Benedict’s reagent, a yellow color when tested with IKI, and a violet color when tested with Biuret reagent. Based on the structure shown below and these chemical results, what kind of biomolecule is this? the molecule a blue color with benedicts reagent.no color change that given molecule is not a simple carbohydrate
Answer:
The molecule is a protein
Explanation:
When the molecule was tested with benedict's solution and a blue color was formed, that actually meant there was no colour change because the colour of benedict's solution is blue. Benedict's solution is used to test for the presence of reducing sugar, which changes it's colour to green, orange, yellow or even red; the fact that there was no colour change shows the molecule is not a reducing sugar.
Yellow colour when tested with IKI (Iodine-potassium iodide) also shows no colour change. IKI reagent is used to determine the presence of starch, which gives off a dark-blue colour if starch is present. Hence, absence of this dark-blue colour or observation of a yellow/orange colour shows the molecules is not starch.
Biuret reagent is used to test for peptide bonds in a molecule. In the presence of a peptide bond, the biuret reagent changes colour from blue to violet. The amino acids in proteins are held together by peptide bond, hence the biuret colour change shows that the biomolecule is a protein.
do prokaryotes have chromatin?
Answer:yes
Explanation:
Yes
3. Phosphorus represents only 1% of human body weight. However, it is a building
block of very important macromolecules. Describe some of the cellular functions
that would not be possible without phosphorus.
Answer:
It would be impossible to store and transfer genetic information
It would be impossible to carry out majority of cellular activities due to lack of usable energy.
Explanation:
Phosphorus, as stated in the question, represents a very low amount in our body system, however, its role in living systems cannot be underestimated. Phosphorus is a vital component of major biomolecules in our system.
- It is the building block of the NUCLEOTIDES that make up nucleic acids. Nucleic acids (DNA and RNA) store genetic information and help transfer it to offsprings. However, without one of the elemental components (phosphorus) that make up its structure, it will not be produced. Hence, the storage and transfer of genetic information will be impossible.
- Phosphorus also makes up the structure of the ADENOSINE TRIPHOSPHATE (ATP) molecule. ATP provides the cell with all the energy used in carrying out cellular functions. However, the absence of phosphorus needed for the synthesis of ATP, ATP will not be produced and ultimately no energy.
What is the composition of hair?
Answer:
The hair is made up of 95% keratin, a fibrous, helicoidal protein (shaped like a helix) that forms part of the skin and all its appendages (body hair, nails, etc.). Keratin is synthesized by keratinocytes and is insoluble in water, thus ensuring impermeability and protection for the hair.
Explanation:
True or False? The low power objective lens has a greater magnification than the high power objective lens.
Answer: true
Explanation: i said so
What are the two divisions of the autonomic nervous system?
A. sympathetic and central nervous systems
B. central and somatic nervous systems
C. sympathetic and parasympathetic nervous systems
D. parasympathetic and somatic nervous systems
The two divisions of the autonomic nervous system are the sympathetic and parasympathetic nervous systems. The correct option is C. sympathetic and parasympathetic nervous systems.
Nervous systemFrom the question, we are to determine the two divisions of the autonomic nervous system.
The nervous system is divided into two main parts, which are
Central nervous system.Peripheral nervous system.The central nervous system is made up of the brain and the spinal cord, while the peripheral nervous system is made up of the nerves and ganglia that lie outside of the brain and spinal cord.
The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system.
The autonomic nervous system is further divided into the sypathetic nervous system and the parasympathetic nervous system.
The sympathetic nervous system is for fight or flight responses, and
The parasympathetic nervous system is for rest and digest responses.
Hence, the two divisions of the autonomic nervous system are the sympathetic and parasympathetic nervous systems. The correct option is C. sympathetic and parasympathetic nervous systems.
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HELP PLEASE :,,,,,,,|
Answer:
i think it is B
Explanation:
i hope it help
I need help with my biology work please
I did the. work on this piece of paper and the only reason I'm typing here is because I need an answer to submit
B-cells do which of the following things?
a. Make antibodies
b. Inhibit Function of other T-cells and B-cells
c. Stay in circulation to speed up response to an antigen the next time
d. Stimulate Function of other T-cells and B-cells
e. Take in and process antigens binding them to MHC protein
f. Attack cells infected by viruses
Answer:
a. Make antibodies
Explanation:
B-cells is one of the two types of lymphocytes or white blood cells produced in the marrow of the bone (the other being T-cells). B-cells are a part of adaptive or acquired immunity in our body i.e. a learned defense after a pathogen might have penetrated.
B-cells help combat foreign Invaders that make way into the body by producing ANTIBODIES, which are specific to a particular pathogen. Note that, the B-cells learnt to combat based on a previous infection of such pathogen. In response to an antigen, the B-cells produce the plasma cells, which in turn produce the antibodies.
why insect mouth part is important for insect pest control?
Answer:
Insects with rasping/sucking mouthparts actually rasps or scrapes the surface of plant tissue (such as leaves or petals) and sucks up the fluids that ooze from the damaged area of tissue. Examples of pests with rasping-sucking mouthparts include thrips and mites. Thrips prefer to feed on succulent plant tissues.
Explanation:
I hope it helped
can anyone help me with the questions above?
it says : which type of market structure consists of many firms which drive the price of a good or service down?
the answers are there
Answer:perfect competition
Explanation:
A student who studies the sizes of groups of birds records
data for this group of ducks.
Which two terms describe the relationship between the two variables in this graph
A:negative
B:strong
C:weak
D:positive
Negative and strong apex
Answer:
c
Explanation:
You are running a marathon and observe that running increases your pulse rate. Using what you know about the scientific method complete the following:
1. Hypothesis: __________________________________________________________________
_____________________________________________________________________________
2. Independent variable: _________________________________________________________
3. Dependent variable: ___________________________________________________________
4. Controlled variables (at least 3): _________________________________________________
_______________________________________________________________________________
5. Control Treatment: ___________________________________________________________
6. Experimental Treatment: _______________________________________________
Answer:
hypothesis is A hypothesis (plural hypotheses) is a precise, testable statement of what the researcher(s) predict will be the outcome of the study.
Explanation:
independent variable is what u can change
dependent variable is the one u can measure
control variable is one u keep the same
control treatment In the design of experiments, treatments are applied to experimental units in a treatment group. In comparative experiments, members of a control group receive a standard treatment, a placebo, or no treatment at all. There may be more than one treatment group, more than one control group, or both
experimental treatment in research, the conditions applied to one or more groups that are expected to cause change in some outcome or dependent variable.
The total magnification of a specimen viewed under a compound light microscope is determined by the power of the objective lens added to the power of the ocular lens the magnification power of the ocular lenses used the power of the objective lens multiplied by the power of the ocular lens the magnification power of the objective lenses used
Answer:
The power of the objective lens multiplied by the power of the ocular lens
Explanation:
Answer:
c. The power of the objective lens multiplied by the power of the ocular lens
Explanation:
30. An anatomist wishes to make detailed comparisons of
medial surfaces of the left and right sides of the brain. This
work requires sections that show the entire medial surface.
Which kind of sections should be ordered from the lab for
this investigation?
Answer and Explanation: In anatomy, bodies are divided by hypothetical geometric planes to describe location or direction of its structures. These planes are called Planes There are 3 reference planes:
1) Sagittal Plane divides the body into sinister and dexter (left and right) sides.
2) Coronal Plane divides into anterior and posterior portions.
3) Transverse Plane divides into superior and inferior portions.
For the anatomist, to have a section that shows the entire medial surface, should be ordered the Sagittal Plane, more especifically midsagittal (median) plane.
A stimulus causes a change or response in an organism.
O True
O False
a
Answer:
the answer is true
Explanation:
I hope that's helps
A stimulus causes a change or response in an organism. This statement is true.
What is Stimulus?A stimulus is defined as a detectable change in the physical or chemical composition of an organism's internal or external environment. It is the ability of an organism or organ to detect external stimuli so as to make an appropriate response is called sensitivity.
A stimulus can also cause an action or response which is like the ringing of the alarm clock even if we didn't sleep through it. The stimulus can include:
Irritants.Sights.Smells.Sounds.Temperature changes.A stimulus causes a change or response in an organism where the shape of a cell can tell about the job the cell is doing. Cell theory is the result of one person's hypothesis and observation.
Thus, a stimulus causes a change or response in an organism. This statement is true.
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15. The complex carbohydrates pictured below are made by linking
molecules of glucose. In all three complex carbohydrates, the subunits of
glucose are bonded together differently. Because they have different
structures, they most likely - *
Starch
Cellulose
Glycogen
pain i need the answer
Answer:
they perform different functions
How are mean and median alike?how are they different?
Answer:
Mean is the average you'll get when you add all your numbers then divide by the number of numbers you have. On the opposite side, median is the middle number within your list of numbers. If there isn't a middle number, take the two middle numbers and add them. Now, for how they are alike, I'm not so sure :'), but my closest guess would be they are fairly close together.
Sorry it's so long, hope I helped you :')
Explanation:
HELP ASAP!!!
Which group of elements are present in all macromolecules in living things? (8.9A)
C, H, P, N
C, H, O
Na, CI, O
OS S. P, C, O
Answer: the answer is C,H,O
Explanation:Option B is correct
Answer:
c,h ,o
Explanation:
When presented with the question “Does soil acidity have an effect on the production of peppers,” develop a hypothesis to answer this question and then design a small controlled experiment to test the hypothesis, listing all procedures and variables. PLEASE PLEASE SOMEONE HELP!!!!!!!!!!!
Answer:
well just search in google if someone did a lab and then copy the lab. But basically, yes it would. The pepper plant would either die or have to adapt to the acidic soil which it wouldn't be able to do. But have a control which has no acidity and then have three other plants with more acidity then the last and watch them grow.
Explanation:
What is the Density of an object with a mass of 20 grams and a
volume of 10 cmº?
Which of the following orders of animals are vegetarians?
a. Proboscidea
b. Artiodactyla
c. Lagomorpha
d. All of the above
Answer: Option D.
All of the above.
Explanation:
Proboscidea , Artiodactyla , Lagomorpha are all vegetarians and vegetarians are animals that feed on plants i.e grasses, shrubs e.t.c.
These order of animals are refered to herbivorous animals i.e animals that feed on plants and they have two pairs of growing incisors,molars and premolars.
Members of lagomorphs are rodents, hares, rabbit, pikas e.t.c.
Artiodactyla members are cattles, camels, pigs e.t.c. These order have tusks for defending themselves.
Proboscidea include elephants.
what are the basic building blocks of fats?
Answer:
Fatty acids are the building blocks of the fat in our bodies and in the food we eat. During digestion, the body breaks down fats into fatty acids, which can then be absorbed into the blood. Fatty acid molecules are usually joined together in groups of three, forming a molecule called a triglyceride.
What is in the center of every atom?
Answer:
The Nucleus, comprised of Protons and Neutrons.
water molecules are polar with the
If plants in a population seriously decreased, how would the animals in that population be affected? EXPLAIN
Answer:
because a lot of animals eat plants, so a lot of animals will die off/ or move to a place with lots of plants.
Explanation:
most animals live off eating plants.