Ans. (D). mucus and stomach acid.
The first line of defense can be defined as the defense system that inhibits the entry of disease-causing pathogens or their components. It includes tears, skin, mucus, stomach acid, good bacteria, cilia, and neutrophils.
Pathogens present in food substances killed by antimicrobial substances present in saliva, mucus produced by epithelial lining of gastrointestinal tract, and stomach acid or hydrochloric acid. So, if a pathogen present in food got past saliva, it would be targeted by mucus and stomach acid.
Thus, the correct answer is option (D).
The first line of defence can be defined as the defence system that inhibits the entry of disease-causing pathogens or their members. It has tears, skin, mucus, stomach acid, good bacteria, cilia, and lymphocytes.
What is the first and second line of defense?The first line of protection is defined by the people on the front lines. They're driving risk, complying with regulations and standards, and taking out the company's defined risk management processes daily.
The second line of defence is executive and is liable for oversight of the doers.
Thus, option "A" is correct, stomach acid and lymphocytes.
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What is the carbohydrate formed in photosynthesis?
a ATP
b carbon dioxide
c glucose
d lactose
The right option of this question is (C).
ExplanationPlants during the photosynthetic reaction, the energy and carbohydrates produce to maintain their life cycle. The photosynthetic system consists on two part as light-dependent an independent cycle. In the dependent cycle, the plants use the light to generate the energy compounds as ATP to start up the Independent cycle. The independent cycle also known as the Calvin Cycle, the environmental carbon dioxide is fixed to generate the carbohydrates. The most important carbohydrate that generates in this process is the glucose. The plant generates carbon dioxide and lactose is only present in milk.
So, the best option is (C) as glucose.
in a solution a substance that is dissolved is called ----
Answer: Solvent
Explanation:
A solution is made of two substances one is solute and the other one is solvent. The substance that get dissolved is called as solute and the liquid in which the solute is dissolved is known as solvent.
The solute and the solvent combine together to form solution. It is a homogeneous mixture in which the solute and the solvent cannot be distinguished.
Hence the correct answer is solvent.
Why is light not a reactant or a product in photosynthesis?
Final answer:
Light is essential for photosynthesis as it powers the light-dependent reactions, but it is not listed as a reactant or product because light is a form of energy, not a substance that is consumed or produced in the reactions.
Explanation:
The subject of your question is photosynthesis, in which light plays a crucial role but is not listed as a reactant or a product. This is because light is a form of energy rather than a substance that combines chemically during photosynthesis. In the light-dependent reactions, light energy is harnessed by pigments within the chloroplasts and converted into chemical energy in the form of ATP and NADPH. These compounds are used in the Calvin cycle or light-independent reactions, to fix carbon dioxide into organic compounds like G3P.
While light is essential for the initial stage of photosynthesis, it does not get consumed or produced; instead, it acts as an energy source driving the synthesis of ATP and NADPH. These energy carriers then provide the necessary power for the light-independent reactions to produce carbohydrates from carbon dioxide. Therefore, while not listed as a reactant or a product, light is fundamentally indispensable for the overall process of photosynthesis.
A scientist is studying a cross between plants that are heterozygous (Xx) for a certain trait. She will use a table similar to this one to make a Punnett square for the cross.
Which percentage of offspring will most likely have the genotype represented by the letter A in this table?
0%
25%
50%
75%
Answer:
Option B, [tex]25\\[/tex] %
Explanation:
The heterozygous genotype of the parent is Xx
The punnet square for the cross between the two parents having Xx genotype is
X x
X XX Xx
x Xx xx
Thus,
A represents the genotype – XX
B represents the genotype – Xx
C represents the genotype – Xx
D represents the genotype – xx
Out of four possible genotypes, XX (A) appears only once.
Thus the probability of occurrence of genotype A (XX) will be
[tex]\frac{1}{4} * 100\\= 25\\[/tex] %
Answer:
B, 25 percent
Explanation:
hope i got it right
Compare and contrast the structure and function of a compound light microscope and a scanning electron microscope. Be sure to discuss the structure and function of each as well as the function and usefulness of each when examining a specimen.
If a single cell dies in a multicellular organism, what happens to the organism
Unconformities occur when:
younger rock is placed on top of older rock
igneous structures cut across layered rock
eroded surfaces are covered by younger rock
an entire sedimentary bed is deposited at the same time
Answer:
The answer is: Eroded surfaces are covered by younger rocks.
Explanation:
The contacts between strata that do not occur underlying rocks in immediate order of age, or that do not fit together with them as part of a continuous whole, are called inconfonnities.
Thus an inconfonnity is a surface of erosion or non deposition that represents a significant hiatus, and separates younger strata from older rocks.
The answer is: Eroded surfaces are covered by younger rocks.
what is the photoreceptor that allows plants to detect day length called
The photoreceptor that allows plants to detect day length is called phytochrome.
Explanation:The photoreceptor that allows plants to detect day length is called phytochrome. Phytochrome is a protein covalently bonded to a light-absorbing pigment called a chromophore, and together they are known as a chromoprotein. Plants use the Pr/Pfr ratio of phytochrome at dawn to determine the length of the day/night cycle, allowing them to detect the change of season and adjust their physiology accordingly.
Final answer:
Phytochrome is the photoreceptor plants use to detect day length, aiding in photoperiodism, which is essential for recognizing seasonal changes and determining when to conduct crucial activities like flowering.
Explanation:
The photoreceptor that allows plants to detect day length is called phytochrome. Plants can sense the time of day and time of year by sensing and using various wavelengths of sunlight. The phytochrome molecules in plant leaves can convert between forms that absorb red light (Pr) and far-red (Pfr) light. At dawn, these molecules convert to the active Pfr form, which can remain in that form until sunset. At night, the Pfr slowly reverts to the Pr form. By measuring the ratio of Pr to Pfr at dawn, plants can determine if the nights are shorter or longer, which corresponds to different seasons.
Unfiltered sunlight is rich in red light, which is essential for the conversion process. Plants use this conversion to sense the change of season and exhibit photoperiodism, the reaction to the length of day or night. This is essential for crucial plant activities like flowering, setting winter buds, and vegetative growth. For instance, short-day plants flower when nights exceed a certain length, while long-day plants flower when the nights are shorter than a specific threshold.
By the end of mitosis, _______ cells are produced, whereas by the end of meiosis, _______ cells are produced. A. four; two B. two; four C. three; one D. one; three
By the end of mitosis, two cells are produced. whereas, by the end of meiosis, four cells are produced. Therefore, option B is correct.
What is meiosis and mitosis?There are two types of cell divisions and that is mitosis and meiosis. Mitosis takes place in all somatic cells, while meiosis division takes place in gametes.
Mitosis is also known as equilateral cell division, in which the parent cell is divided into two daughter cells and the genetic material such as chromosomes and DNA are duplicated and then transfer into two daughter cells. The number of chromosomes remains the same in the parent cell and daughter cell.
Meiosis occurs in gametes, in which the parent cell is divided into four daughter cells. It involves two rounds of division that ultimately result in four cells with only one copy of each chromosome. Hence, option B is correct.
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does a drop of pond water contain a macrocosm
In what phase of meiosis are sister chromatids separated and pulled to opposite ends of the cell?
Artificial levees and dams are structures used to control ___.
A. Erosion
B. Flooding
C. Groundwater
D. Deposition
Artificial levees and structures are used to control flooding.A levees is an embankment which is made to prevent flooding.The main purpose of an levees is to prevent flooding of the adjacent countryside .This embankments runs parallel to the course of river.By confining the flow of the river there is a significant increase in the velocity of water flow.Dams are constructed to hold back the water and use it as a reservoir.They hold the water prevents from flooding.
_are chemicals that are essential to all cellular activity, helping the body convert carbohydrates and fats into energy
Answer:
The answer is vitamins
Explanation:
when would the displacement technique of measuring need to be employed?
Answer:
its b i just did this question
Explanation:
which moon phase would someone see at position 2?
incomplete sentence, describe the flow of energy from the sun to the producer and then to a consumer ( in other words consider how u get energy from the sun)
An ion which has lost two electrons has a charge of:
0
-2
+2
-6
Answer:
+2
Explanation:
An ion is an electrically charged particle consisting of an atom or molecule that is not electrically neutral. In the case in which an atom loses 2 electrons, its charge is positive and is symbolized as +2.
For examples common ions that have lost two electrons are: Fe2+, Mn2+.
Explain how sexual reproduction increases genetic diversity in many species of plants and animals, make sure to include the importance and function of gametes.
If a sedimentary rock becomes molten, what type of rock will be formed?
Melting and cooling sedimentary rock creates igneous rock. Subduction of a sedimentary tectonic plate is typical. As the tectonic plate advanced deeper into the crust and toward the mantle, sedimentary rock melted and became lava.
What is sedimentary rock?The sedimentary rock formation process begins with the deposition of fragments of pre-existing rocks or once-living organisms. They come into being as a result of deposits that build up on the surface of the earth. Layering or bedding structures can frequently be observed in sedimentary rocks.
Oil, natural gas, coal, and uranium, our primary energy resources, are created in sedimentary rocks and originate from them. Construction sand and gravel are derived from sediment. Sandstone and limestone are utilized as construction stone. Plaste is produced using gypsum rock.
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which term describes the changes that occur in an organism during its lifetime
Final answer:
The changes that occur in an organism during its lifetime are described as development, which is part of an organism's life cycle and includes changes in size, form, and structure.
Explanation:
The term that describes the changes that occur in an organism during its lifetime is development. Development involves an organism changing in structure, form, and function as it progresses through various stages of its life cycle. This life cycle includes events such as gestation, birth, maturity, senescence, and death. Development is evident in the alterations in size, form, and structure that occur during an organism's lifespan. For instance, multicellular organisms typically start from a single cell that proliferates to many cells, which then stay together after dividing to produce a complex structure. These changes are part of an organized process that is controlled in some manner, and it's important to note that development in organisms can lead to not only growth but sometimes also a reduction in size and complexity, which may eventually result in the end of the organism's life.
which influences both chemical weathering and mechanical weathering? iron plants tectonic plates wind
The correct option is A.
Plants can participate in both mechanical and chemical weathering of rocks. Mechanical weathering occurs when rocks are broken into smaller particles as the result of the roots of plants which grows and push them apart. Chemical weathering occur when the plant roots release chemicals, such as acids, which help in breaking down the rock particles.
Because bryophytes do not have vascular tissue, they do not conduct ____________.
Final answer:
Bryophytes, lacking vascular tissue, are unable to conduct water and nutrients efficiently, which keeps them small and confines them to moist environments. They use diffusion and osmosis to absorb what they need and lack true roots, stems, or leaves.
Explanation:
Because bryophytes do not have vascular tissue, they are unable to conduct water and nutrients efficiently throughout their bodies. Vascular tissue, which comprises of xylem and phloem, is the specialized system for this transport in vascular plants. Bryophytes lack these structures and hence cannot transport water and nutrients over long distances, limiting their size and habitat to moist environments where these resources are readily available.
Bryophytes include species such as mosses, liverworts, and hornworts, and they thrive in habitats ranging from tundras to deserts, although their growth is primarily dense in damp areas. Their inability to conduct water and nutrients effectively is due to the absence of lignin-reinforced cells, which are present in the vascular system of more advanced plants. Instead, they rely on diffusion and osmosis across their gametophyte surfaces to absorb moisture and nutrients.
The lack of a conductive system also means that bryophytes typically do not have true roots, stems, or leaves, and instead, possess root-like structures (rhizoids) for anchorage and absorption of water and minerals. This evolutionary trade-off has restricted bryophytes to smaller sizes and limited their competitive ability against larger vascular plants in drier environments.
How do land Animals prevent water loss?
are there cliffs or cracks on deimos?
During the winter, many species of amphibians and reptiles go into a hibernation-like state called overwintering. They eat little or no food, slow their metabolism and breathing rate dramatically, and most of their bodily functions shut down. Interestingly, many of these species choose to spend the winter underwater. Why might it be advantageous to overwinter at the bottom of a pond rather than on land?
If the mother is homozygous recessive and the father is homozygous dominant. What are the genotypes of the parents?
When a substance gains hydrogen atoms in a chemical reaction is called
which two structures would provide a positive identification of a plant cell under a microscope?
In this equation for photosynthesis, where does the second reactant come from and what happens to it in the photosynthesis process?
6CO + 6H O --> C H O + 6O
2 2 6 12 6 2
A. carbon dioxide comes from air and is broke down in the Calvin cycle
B. water is split to drive NADP to NADPH conversion, and it is formed in the Calvin cycle
C. Glucose is formed right after the Calvin cycle
D. oxygen is released as a gas after water is split
PLEASE ANSWER ASAP!
GIVING OUT BRAINLIEST!!!
The right answer is C - Oxygen is released as a gas after water is split.
The second reactant here is H2O (water), and it reacts during electron transport chain of chloroplast.
In chloroplasts, light is used to oxidize water to oxygen, and to reduce NADP + to NADPH on the other hand, with concomitant proton injection into the lumen of thylakoids. In the mitochondria, oxygen is reduced to water while NADH is oxidized to NAD + and the succinate is converted to fumarate, with concomitant expulsion of protons out of the mitochondrial matrix.
Answer:
The second reactant is water and it comes from the root through absorption
The correct choice among the given options is option B, Water is split to drive NADP to NADPH conversion, and it is formed in the Calvin cycle
Explanation:
The second reactant in this equation is water and it comes from the root through absorption.
The water used in the process of photosynthesis is obtained from root which transport the water up to the leaves through the Xylem vessels. In the photosynthesis reaction the water molecule is splitted to produce hydrogen ion and free electrons after receiving the light energy from sun. The free electrons are then taken up by a carrier molecule NADP there by transforming it from NADP+ to NADPH. This step of stablisation of NADP+ to NADPH is a part of calvin cycle.
Please help me with this question
A. Facilitated Diffusion
B. Active Transport
C. Simple Diffusion
D. Osmosis