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Ribozymes conflict with the belief of early molecular biologists that each enzyme is a polypeptide. A ribozyme is composed of RNA.

A ribozyme (ribonucleic acid enzyme) is an RNA molecule capable of speeding up a chemical reaction.

In consequence, ribozymes have catalytic activity.

For example, within the ribosome, the large subunit of ribosomal RNA acts as a ribozyme that links amino acids during the synthesis of polypeptide chains.

On the other hand, enzymes are specific proteins (composed of amino acids) that can speed up chemical reactions.

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Answer:

1) Diffusion : Is the movement of molecules / ions from a region of higher to lower concentration. It may or may not occur across a semi permeable membrane.

In diffusion there is no challenge involved as it is along the concentration gradient, but in active transport movement of molecules occur against concentration gradient ie; from lower to higher concentration.

2) For active transport, energy is vital for movement, in this case protein molecules function as molecular pumps to enable the cell accumulate glucose/ions, against concentration gradient. Here metabolic energy ATP is required.

3)Facilitated diffusion is a type of passive transport in which ions/molecules cross the semi permeable membrane because permeases present in the membrane facilitate the transport.

Like simple diffusion facilitated diffusion doesn't require metabolic energy and simply occurs across the concentration gradient.

4) Osmosis : is movement of water from hypotonic solution (lower concentration) to hypertonic solution (higher concentration) through a semi permeable membrane.

The cell membrane being permeable to water allows to and fro movement of water molecules along the concentration gradient.

Answer:

A graphical representation of results is shown in figure 1. 17. He gave a talk on the representation of women in 19th-century art. ... He is writing a book on the representation of woman in medieval art

During RNA processing, a protective cap is added to the 5' end of the pre-mRNA, a tail of many adenine nucleotides is added to the 3' end, and only introns are removed. The correct option is C.

The pre-mRNA synthesized during transcription undergoes some processing before being ready for translation.  The first thing is the addition of a protective cap to the 5' end and the modification of the 3' end by the addition of a long string of adenine nucleotides.

Thereafter, the pre-mRNA is spliced to remove non-coding sequences, also known as introns. The coding sequences (exons) are joined afterwards before the mRNA is ready to be translated.

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Answer:

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions

Answer:

Explanation:

A skeletal muscle cell is surrounded by a plasma membrane called the sarcolemma with a cytoplasm called the sarcoplasm. A muscle fiber is composed of many fibrils, packaged into orderly units.

Answer: microorganisms are found in nearly every environment and are said to  be ubiquitous

Explanation:

Have a nice study time

Answer:

Explanation:food, water, habitat, and mate.

Limiting factors can be either abiotic or biotic. Examples: Abiotic → water, pH, radiation, salinity. Biotic → predation, competition, parasitism.

The ecosystem is composed of living and non-living elements that interact and depend on each other. These are the biotic and abiotic factors.

• Abiotic factors are physical and chemical components of the ecosystem. These are the non-living elements.

• Biotic factors are all the living components in the ecosystem.

Biotic and abiotic factors influence the survival and reproduction of living beings.

Limiting factors are environmental conditions that act directly on populations and individuals, limiting their distribution and growth.

These factors might be either biotic or abiotic and affect natality and mortality rate, migration, etcetera.

Limiting factors might be a result of the population density or might be dense-independent.

When talking about dense-independent limiting factors we are referring to

When talking about dense-dependent limiting factors we are referring to biotic factors and the interactions established between species that control other species' growth.

These are, for instance,

Each species carries out a different role in these interactions.

These relationships and the results are what determine the destiny of the populations and their size.

Now, since I do not have the text, I will suggest a few examples of limiting factors. Take a look at them and then look for some other examples in your reading.

Limiting biotic factors:  

Limiting abiotic factors:

Following this framework, you should look in your reading which limiting factors are described.

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Osmosis is also used for preserving fruits and meats, though the process is quite different for the two. In the case of fruit, osmosis is used to dehydrate it, whereas in the preservation of meat, osmosis draws salt into it, thus preventing the intrusion of bacteria.

Answer:

The Answer is: pyruvate oxidation

Explanation:

In prokaryotes, it happens in the cytoplasm. Overall, pyruvate oxidation converts pyruvate—a three-carbon molecule—into acetyl CoAstart text, C, o, A, end text—a two-carbon molecule attached to Coenzyme A—producing an NADHstart text, N, A, D, H, end text and releasing one carbon dioxide molecule in the process.

Answer:

1590’s

What year did Hans and Zacharias Janssen contribute to the cell theory? Hans and Zacharias Janssen are known for inventing the compound optical microscope. They made it in the 1590’s. This contributed to “The Cell Theory” by making it easier and more practical whilst observing cells.

Explanation:

Cell theory states that all biological organisms are made up of cells, which is the structural and functional unit of life.

Scientists Hans and Zacharias Janssen invented the compound microscope that played a vital role in observing cellular functions.

Hans and Zacharias Jansen invented the compound microscope, which consisted of the eyepiece and an objective lens.

The scientists discovered the compound microscope in the late 16th century, which then helped many scientists to magnify and observe the microscopic structures.

Thus, the Janssens discovered the compound microscope.

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Answer:

it will disolve

Explanation:

Cordgrass is a biotic factor for the snails because it is a living source of protection in the Atlantic salt marshes for the snails. Hence option B is correct.

Biotic factors - The living components or the living things that are present in the ecosystem that shapes the environment are known as biotic factors. Examples are plants, bacteria, algae, birds, fishes etc.

A ecosystem runs through the interaction of biotic and abiotic component.  Biotic supplements acts as a fuel that supports the bacterial growth.

Periwinkle snails graze on the top of the cordgrasses to escape from their predators blue crab. They graze on the fungi and algae that is inhabitant on top of the grass, they do not feed directly on the cordgrass

While grazing they actually damage the cordgrass by spreading the fungal infection.

Hence, option B is Cordgrass is a biotic factor for the snails because it is a living source of protection in the Atlantic salt marshes for the snails is correct.

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The correct question is :

One of the most common plants in Atlantic salt marshes is cordgrass. Periwinkle snails cling to the top of tall cordgrasses during high tide. The tall cordgrasses provide protection from the snails’ predators, such as the blue crab. While the snails do not feed directly on the cordgrass, the snails can damage the cordgrass when they graze on algae and fungi that grow on the grasses. If the snail population grows too large, it can decrease cordgrass growth.

Question

Based on the passage, which of the following describes the ecological role that cordgrass serves for the snails?

Responses

A. Cordgrass is a biotic factor for the snails because it is the snails’ main food source.

B. Cordgrass is a biotic factor for the snails because it is a living source of protection in the Atlantic salt marshes for the snails.

C. Cordgrass is an abiotic factor for the snails because it provides habitat for the snails and crabs.

D. Cordgrass is an abiotic factor for the snails because it produces algae and fungi for the snails.

cytoplasm and plasma membrane

Pseudopodia are formed by some cells of higher animals (e.g., white blood corpuscles) and by amoebas. During amoeboid feeding, pseudopodia either flow around and engulf prey or trap it in a fine, sticky mesh.

Answer:

Relative time is the physical subdivision of the rocks found in the Earth's geology and the time and order of events they represent. Absolute time is the measurement taken from the same rocks to determine the amount of time that has expired.

Explanation:

The key principles of Mendelian inheritance are summed up by Mendel's three laws: the Law of Independent Assortment, Law of Dominance, and Law of Segregation.

Answer:

c

Explanation:

Answer:

No.

Explanation:

No, solute molecules are larger in comparison to solvents, so they cannot pass through the semi-permeable membrane.

Answer:

Nope Nope Nope, They cannot pass through it

Explanation:

Osmosis describes the diffusion of the solvent through a semipermeable membrane. The driving force of the solvent shift is the concentration difference of solutes in the solutions separated by the semipermeable membrane. In contrast to solvent, solutes cannot pass this barrier.

Answer:

By experimenting on the hypothesis using step by step scientific methods.

Gathering the data, analyzing the data, drawing conclusions and if the hypothesis isn't conclusive a new hypothesis will be formulated to check out the problem.

Answer:

A grasslands have few trees

Explanation:

The statements about meiosis that are false include the following:

C. During meiosis II, paired homologous chromosomes move up to the equator of the cell.

G. In meiosis II, ploidy is reduced.

H. During anaphase I, sister chromatids separate.

Meiosis can be defined as a type of cell division or duplication that occurs in all body cells found in living organisms, through which a single cell divides twice to produce four (4) haploid cells (gamete).

During cell division, deoxyribonucleic acid (DNA) must be replicated before meiosis can take place in any body cell found in living organisms.

Generally, the phases or steps that occur during meiosis include:

Furthermore, the statements about meiosis that are false include the following:

1. During meiosis II, paired homologous chromosomes move up to the equator of the cell.

2. In meiosis II, ploidy is reduced.

3. During anaphase I, sister chromatids separate.

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Answer:

alter precipitation and storm patterns

Explanation:

Answer:

Your heart  increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps. Generally speaking, your heart beats both faster and stronger to increase cardiac output during exercise.

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Answer:

attarction between a codon

Explanation:

Answer:

independent variable

Explanation:

Answer:

it is made of phospholipid bilayer along with other various lipids, proteins, and carbohydrates

Answer:

Chloroplasts absorb sunlight and store chemical energy

Explanation:

The chloroplasts capture sunlight and store energy