What must happen before a chemical reaction can begin?

Answer:

A.) the ability of pathogens to resist treatments

Explanation:

Answer:

Explanation:

Viruses are set of organisms that are incapable of replicating on their own. They depend on an host cell to reproduce and they achieve this by infecting the host cell. Hence, the process of infection of a virus is regarded as its reproductive life cycle. Generally, a virus attaches itself to the surface of its host cell by recognizing and binding to specific receptor sites. This phase is called ATTACHMENT.

It then inserts its genetic material into the host's genome in a process called PENETRATION. It employs its host cell's transcriptional, translational, replication abilities to reproduce its genetic material. After this, some viruses exit the host cell by bursting the cell open in a process called LYSIS, however, others incorporate their genetic material into the host's and becomes part of the host.

Hence, as the host replicates its own genetic material, it also replicates the viral genetic material and passes it on to Its offsprings. This process is called the LYSOGENIC cycle, it is opposed to the LYTIC cycle being that the virus does not kill the host cell.

Domain is the highest level of classification. Domain includes EVERY species.

Explanation:

According to the Woese system, launched in 1990, the tree of life consists of three domains three domains are the Archaea, the Bacteria, and the Eukarya. Prokaryotic organisms apply either to the domain Archaea or the domain Bacteria; organisms with eukaryotic cells apply to the domain Eukarya.

The level of classification that includes the most species would be the domain.

Level of classification

The different levels of classification of living organisms from the highest to the lowest are:

The number of organisms in each level decreases from the highest to the lowest. Thus, the domain has the highest number of organisms while the species has the lowest number.

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Answer:

The correct answer will be option other scientists repeated the experiment.

Explanation:

Ernst Rutherford is also known as "Father of nuclear physics" known for his planetary model of atom called "Rutherford model of the atom". He proposed and demonstrated the model in 1911 explaining that atom carries a small charged nucleus in the center which is surrounded by the tiny electrons.

The Rutherford's atomic model was accepted by the scientific community at that time because of the probable reason that his results were based on experiments which were also supported by the experiments of other scientists who repeated the experiments to check the accuracy and feasibility of the model. His experiments were repeated by a famous scientist and his student James Chadwick who discovered neutrons.

Thus, option other scientists repeated the experiment is the correct answer.

Derrick's experiment to determine the best detergent for removing mud is not necessarily valid because it lacks controlled variables and consistent testing conditions. Laundry detergents are used instead of bar soap because they are more soluble in a variety of water conditions and do not leave deposits. Lemon juice is more acidic than orange juice.

Derrick's conclusion that Brand B is the best detergent for removing mud from clothes is not necessarily valid because his experiment lacks controls and uses different items of clothing, which might not be comparable due to variations in fabric type, amount of mud, duration of mud on fabric, and other factors. To accurately compare the effectiveness of different brands of laundry detergent, it would be important to use identical conditions for each treatment, such as the same type of fabric, equal amounts and types of mud, and consistent washing conditions.

When doing a load of laundry, we don't just drop a bar of soap into the washing machine because soap molecules have a dual nature. The head dissolves in water, while the tail dissolves in oils and greases. Together, they form micelles that encase the dirt and allow it to be washed away. However, soaps can leave a film, especially in hard water. Laundry detergents contain synthetic surfactant molecules that are more soluble, even in hard water, and they do not leave soapy deposits.

Regarding the pH of juices, lemon juice with a pH of 2 is more acidic than orange juice with a pH of 4. The pH scale is logarithmic, so each whole number on the scale represents a tenfold difference in acidity. Therefore, lemon juice is 100 times more acidic than orange juice.

Answer:

plants, animals, protists, fungi, archaebacteria, eubacteria

Explanation:

Those are all the six kingdoms

Final answer:

In double fertilization, one sperm cell fertilizes the egg cell to form a diploid zygote while another fertilizes the two polar nuclei to create a triploid endosperm, both of which are essential for the development of the seed in angiosperms.

Explanation:

The process you're inquiring about is double fertilization, which is a unique mechanism in angiosperms, or flowering plants. During this process, two structures are fertilized. The first is the egg cell, which, upon fertilization by one of the sperm cells, forms a diploid zygote. The second structure consists of the two polar nuclei found within the central cell of the ovule, which are fertilized by the second sperm cell to form a triploid endosperm. This endosperm will eventually provide nourishment for the developing embryo within the seed.

In the subsequent stages, the zygote divides to form two distinct structures: one develops into a suspensor, which anchors the embryo and facilitates nutrient uptake, and the other into the proembryo that eventually differentiates into the plant embryo. Following these events, the fertilized ovule develops into a seed which contains the embryo, and the surrounding ovary tissue matures into the fruit.

Answer:

Endoplasmatic reticulum and Golgi apparatus.  

Explanation:

The endoplasmic reticulum is a cytoplasmic organelle present in animal and plant cells. This organelle is formed by bags and tubes and has the following functions: production of lipids, detoxification, storage of substances and production of proteins.

The golgi apparatus, on the other hand, is also a cytoplasmic molecule present in eukaryotic cells. Its functions are: storage of substances, transport of substances and the export of substances produced in the Endoplasmic Reticulum.

For this reason, we can say that after proteins are produced in the ribosomes, two organelles work together to help the endoplasmic reticulum and the golgi apparatus in the secretion process.

The first. That is the answer

The nucleus and lysosomes would provide positive identification of an animal cell under a microscope due to their unique structures and biochemical markers. Chloroplasts and flagella are not specific to animal cells and therefore not definitive for identification. Ribosomes are common to all cell types and also not unique to animal cells.

The structures that would provide a positive identification of an animal cell under a microscope are the nucleus and lysosomes. The nucleus is a prominent organelle within eukaryotic cells that contains the cell's genetic material, and it can be identified by its structure as it is typically the largest organelle in the cell. On the other hand, lysosomes are membrane-bound organelles that contain digestive enzymes and can be identified biochemically by the presence of these enzymes. Neither chloroplasts, which are specific to plant cells and certain algae, nor flagella, which are not present in all animal cells, would be definitive for identifying an animal cell. Ribosomes, although found in all types of cells, are not unique to animal cells and hence are not definitive either.

Under an electron microscope, the isolated nuclei might be identified by their large size and the presence of nucleic acids which can be confirmed by molecular analyses. The Rough Endoplasmic Reticulum (RER) would be identifiable by the ribosomes attached to its membrane. Golgi vesicles and lysosomes can be distinguished by their morphology and contents; Golgi vesicles are often seen in stacks or cisternae, whereas lysosomes have a more regular, rounded shape.

The answer is indeed C "Carnivore, Consumer."

The correct answer here is c.

The right option is; b. Trawling gathers fish indiscriminately.

Trawling gathers fish indiscriminately best explains the environmental problems associated with trawling.

Trawling is a method of fishing in which cone shaped fishing nets that are produced from two or more panels are pulled by one or more boats (trawlers) through the water (in the middle or on the bottom). Trawling is non-selective and it captures and removes fish indiscriminately from the water. It gathers small sized species, marketable, and unwanted or non-target species of both legal and illegal size. Trawling can accidentally kill valued species such as sharks and dolphins in water.

Answer:

The answer is B

Explanation:

I just took the edgenu test.

Answer:

Active Transport

Explanation:

During active transport, molecules move from an area of low concentration to an area of high concentration. This is the opposite of diffusion, and these molecules are said to flow against their concentration gradient. Active transport is called "active" because this type of transport requires energy to move molecules.

Answer:

True

Explanation:

Coral reef supports millions of species in and around it. It is known as one of the diverse ecosystem on Earth. The density of species (i.e number of species in a given unit of area) is the highest in coral ecosystem as compared to other ecosystems of the planet. There are approximately thousand species of fish, corals, seahorses, lobsters, sea turtles.  

Answer:

The correct answer is C. Apple

Explanation:

An organism is a living individual which can reproduce, grow, react, adapt, move, metabolize and have an organized structure. All organisms are living things.  

Apple is a fruit that is non-living, it can not reproduce, it does not have an organized structure that can support life in it so apple do not contain any characteristics of life, therefore, it cannot be classified as an organism.

Lizard, trees, and bacteria are organisms because they satisfy all the characteristics of an organism. Therefore the right answer is C. Apple.  

Answer:

Apple

Explanation:

i took test

it ok i thisnk it is kinda a biology question

Answer:

The correct answer would be Green wavelengths are reflected from the algae.

The law of conservation states that the total energy of a closed system remains the same. In simple words, energy is neither created nor it can be destroyed but it can change from one form to another.

Similarly, in photosynthetic organisms such as algae, green light is reflected in the surrounding due to they appear green in color.  

The absorbed light (red and blue wavelengths) are converted into chemical energy (food) through photosynthesis.

It ensures that the total energy of the system remains the same and thus, the law of conservation of energy is not violated.

Answer:

3 Phosphate Groups

Explanation:

ATP stands for adenosine triphosphate. Triphosphate, which describes how many phosphate groups, includes the prefix tri. Tri means three. So, Triphosphate means three phosphate groups.

An adenosine triphosphate (ATP) molecule consists of three phosphate groups attached to an adenine base and a ribose sugar. The ATP molecule is considered highly unstable, due to the repulsion of negatively charged phosphate groups. Breaking the bond between the phosphate groups releases energy.

In a molecule of adenosine triphosphate (ATP), there are three phosphate groups. This molecule is comprised of a nitrogenous base called adenine, a five-carbon sugar called ribose, and the three phosphate groups. The phosphate groups are in a series, which makes the ATP molecule highly unstable due to the repulsion between the negatively charged phosphate groups. The addition of each phosphate group to the molecule requires high energy, leading to the formation of high-energy bonds, particularly between the second and third phosphate groups. This bond is considered a 'high-energy' bond, and when broken, significant energy is released that can be utilized for various cellular reactions and processes. When one phosphate group is removed, ATP converts back to adenosine diphosphate (ADP) in a process called dephosphorylation, releasing energy.

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Answer:

The correct answer will be the arrangement and sequence of nitrogenous bases in DNA.

Explanation:

DNA molecule is a large bio-molecule made up of monomer unit called nucleotides. Each nucleotide is made up of a 5C sugar (deoxyribose and ribose), a phosphate group and four nitrogenous bases (adenine, cytosine, guanine, thymine and uracil in RNA).

These nitrogenous bases are bonded to another base on the complementary strand via hydrogen bond and it is the sequence of the arrangement of these bases in the DNA which provides the nucleic acids with its coding behaviour.

These nitrogenous bases are read by the ribosome during the process of translation in triplets which are made of bases and are known as "codons" and codes for the specific amino acids in a polypeptide.

Thus, arrangement and sequence of nitrogenous bases in DNA is the correct answer.

Answer:

250N

Explanation:

Force may be defined as a push or pull of an object. Force can change the shape, size and movement of any object.

Net force = Total force acting on left - Total force acting on right

Net force=Force 2 + Force 4 - Force 1 + Force 3

Net force=(500+50) - (200+100)

Net force= 250 N.

Thus, the correct answer is option (D).

SOS:

The answer is to control the crossing of the traits!

Hope this helps!

he is 25 years old as of 2019

Explanation: