which of the following cells would not have a well-defined nucleus but would have a thick cell wall and ribosomes?
A) onion cell
B) E. Coli bacteria
C) human brain cell

Nucleic acids, encompassing both DNA and RNA, are biomolecules critical for genetic information storage, protein synthesis, and heredity. They are composed of chains of nucleotides with a sugar-phosphate backbone and sequence-specific nitrogenous bases.

​Nucleic acids are essential biopolymers that are critical for storing and expressing genetic information in living organisms. These molecules include two main types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Each nucleic acid strand is composed of monomers called nucleotides, which contain a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleotides connect via phosphate diester linkages, resulting in polynucleotide chains with directionality, indicated by a free 5' phosphate group and a free 3' hydroxyl group.

Specifically, DNA contains two polynucleotide chains forming a double helix, held together by bonds between complementary bases. It is the molecule that holds the genetic blueprint for protein synthesis and inheritance of traits. RNA, on the other hand, usually consists of a single polynucleotide chain and plays a role in protein synthesis as well as in various regulatory and catalytic activities within the cell.

​By binding together, nucleotides form the backbone of nucleic acids, which in the case of DNA, creates its characteristic double helix shape. The sequence of nucleotides within nucleic acids encodes the genetic instructions vital for cellular functions such as cell division, protein synthesis, and the transmission of genetic information from one generation to the next.

Given their role in protein and hormone production, osteoblasts are expected to contain numerous ribosomes and endoplasmic reticulum. These organelles are essential in protein synthesis and folding.

Osteoblasts, which are immature bone cells, primarily work to produce the protein known as osteoid and some hormones. Because of these functions, we would expect osteoblasts to have many ribosomes and endoplasmic reticulum.

Ribosomes are responsible for creating proteins, while the endoplasmic reticulum plays a vital role in the production and folding of proteins, including hormones. Therefore, it's crucial for osteoblasts, which are highly active in protein synthesis, to have an abundance of these organelles to carry out their functions efficiently.

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Mitosis is the process of cell division that produces two identical daughter cells and involves skin, epithelial, and blood cells, as well as cells involved in regeneration, such as those in starfish. It consists of four phases: prophase, metaphase, anaphase, and telophase followed by cytokinesis.

Four examples of cells that go through mitosis include:

Mitosis is a process that consists of four phases:

The division of eukaryotic cells (cells with a nucleus and more than one chromosome) includes both mitosis and cytokinesis, resulting in the formation of two genetically identical daughter cells.

A cellular process of the dividing cell and its content from the original cell is called mitosis and it generally occurs in all the somatic cells.

When mitosis is complete then two nuclei are produced.

Therefore, option A. two nuclei are produced is correct.

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The choices are:

Part of a chromosome breaks off and does not reattach.

It results in the loss of one or more genes.

DiGeorge syndrome occurs when part of chromosome 22 is deleted.

DiGeorge syndrome causes cleft palate, immune deficiency, developmental issues, and learning difficulties.

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Answer:

Option B, A phosphate, a sugar and a nitrogen base

Explanation:

Nucleotide is a basic building unit of DNA. Each nucleotide comprises of three major constituents – a) A sugar, b) A phosphate and c) a nitrogenous base.  

While forming a DNA molecule, deoxyribose acts as a specific sugar. When the nucleotides are linked together, they are supported by the phosphate bond and sugar as backbone. The two strands of DNA attaches to each other through the  nitrogenous bases in a way that nitrogenous base of one nucleotide attached to the nitrogenous base of other nucleotide through hydrogen bonds.  

Hence, option B is correct

Answer:

Option D

1 YYRR: 2 YYRr: 2 Yyrr: 4 YyRr : 1 YYrr : 2 YyRR : 1 yyRR : 2 yyRr: 1 yyrr

Explanation:

The genotype of the cross between dihybrid cross will be as follows

YR

Yr

yR

yr

So the punnet square for this cross will be as follows -

  YR          Yr           yR          yr

YR YYRR YYRr YyRR YrRr

Yr YYRr YYrr         YyRr Yyrr

yR YyRR YyRr yyRR yyRr

yr YyRr Yyrr         yyRr yyrr

The genotypic ratio is as follows -

1 YYRR: 2 YYRr: 2 Yyrr: 4 YyRr : 1 YYrr : 2 YyRR : 1 yyRR : 2 yyRr: 1 yyrr

Hence,option D is the correct answer

Veins are the type of blood vessel that returns blood to the heart.

The type of blood vessel that returns blood to the heart is veins. Veins are thin-walled vessels that carry blood back to the heart. They have valves that promote the one-way flow of blood toward the heart and prevent backflow.

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The Botulinum toxin is a neurotoxins produced by the Clostridium botulinum. This toxin bind to the neuron presynaptically and by the exocytosis it enters in the neuron. It has a greater affinity to Cholinergic receptors as compared to the acetylcholine. Hence, the toxin causes the decrease in the release of the acetylcholine molecules.

As a result of the decreased in the release of the acetylcholine the neuro-transmission is blocked, and due to this the person dies.

Hence, the given statement is true.

Answer:

absorbs energy

Explanation:

Answer:

C)48

Explanation:

pluto is never wrong

Answer:

Chickens and duck-billed platypus both lay eggs.

If you can answer in only one I would go with the chicken, but that's just me. ;)

Hope I helped, have a nice day!

The bigger the planet the bigger the gravitational pull of the planet , which is also stipulated in Newton Law of gravity. The bigger the planet, therefore, the bigger the atmosphere it would have. This is because its gravity is able to overcome the kinetic energy of the gas molecules (especially when heated by rays from a star they are orbiting) that would allow the gas atoms/molecules to escape into space. This is also why the large planets are all gas giants such as Jupiter.

Answer:

There is a direct relationship between the amount of yeast and the rate of fermentation.

Explanation:

Answer:

Option D, There is a direct relationship between the amount of yeast and the rate of fermentation.

Explanation:

The rate of fermentation increases till the time an optimum stage is not reached . Once the optimum stage is reached , any further increase in yeast concentration do not affect fermentation rate. Thus, it can be said that before reaching optimal value of yeast concentration, the rate of fermentation is directly proportional to the yeast concentration.

Hence, option D is correct.

The right matches are:

1.Hydrologic is matched with D. it's all about water

Hydrology is the science of the earth which is interested in the terrestrial branch of the water cycle, that is to say in the exchanges between the atmosphere, the terrestrial surface and its subsoil. We speak of hydrosphere to designate the part of the planet in which water is located.

2.Rock is matched with B. erosion, deposition, metamorphism

Rocks are natural materials generally solid and formed, essentially or entirely, by an assemblage of minerals, sometimes including fossils (especially in sedimentary rocks), glass resulting from the rapid cooling of a liquid (volcanism, friction .. .) or aggregates of other rocks. The rocks can be formed of a single mineral species (monomeral rocks) or of several (polymineral rocks):

3.Tectonic is matched with E. subduction, uplift, and mantle convection

Tectonics is the study of geological structures of kilometric scale and more, such as mountain ranges or sedimentary basins, and mechanisms that are responsible. This discipline is directly related to plate tectonics.

The lithosphere, the rigid outer shell of the Earth consisting of the crust and part of the upper mantle, is subdivided into plates, called tectonic or lithospheric plates.

4.Carbon is matched with A. photosynthesis and respiration

The 2 main carbon "reservoirs" most directly involved in this cycle are the atmospheric CO2 and the carbon constitutfs of living beings. During photosynthesis, CO2 and water combine (reduction reaction) under the effect of light energy (sun) to form carbohydrates.

Then, in all organisms, these carbohydrates are oxidized to reform water and CO2 during breathing. Part of the energy contained in carbohydrates is converted into ATP. Up to 35% of the CO2 fixed during photosynthesis is released during leaf respiration.

5.Nitrogen is matched with F. it's all about special bacteria

Special bacteria pick up nitrogen and release it in a form that can be assimilated by the plant

To be absorbed by the plant, the nitrogen present in the atmosphere in N2 form must undergo biological transformation processes carried out by microorganisms called nitrogen-fixing bacteria. These nitrogen-fixing bacteria have the main function of capturing the nitrogen present in the air, but also in the soil (thus limiting the losses in the aquifers), and to return it to the plant in an available and assimilable form. Nitrogen in soil is in NO3- form (soil nitrate) and nitrogen in air is in N2 form (atmospheric nitrogen).

6.Phosphorus is matched with C. housed mostly in rock material

Global phosphate mineral resources are estimated at more than 300 billion tonnes in 2014 (US Geological Survey). The largest sedimentary deposits are found in North Africa (Morocco), China, the Middle East and the United States. The exploited phosphorus deposits come mainly from sedimentary or marine deposits, but also magmatic deposits or guano from exotic marine birds.

Answer: Its Protista

Explanation:

The correct answer is Protista as it has a cell wall, autotrophic, unicellular, and eukaryotic.

An organism has the subsequent characteristics: molecular wall, autotrophic, unicellular, and eukaryotic.

Protists are a collection of all of the eukaryotes that aren't fungi, animals, or plants. As a result, it's far a completely numerous institution of organisms. The eukaryotes that make up this kingdom, Kingdom Protista, do now no longer have lots in not unusual places except an exceptionally easy organization.

Hence clear it is that Protista has the following characteristics: cell wall, autotrophic, unicellular, and eukaryotic.

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Answer:

H2O

Explanation:

Water molecule is made of 2 hydrogen atoms bonded with covalent union (sharing electrons) with 1 oxigen molecule

Answer:

The answer is C - Reef food webs are being disrupted and significantly losing biodiversity.

Explanation:

Answer:

A) Ice cream starts dripping down the sides of an ice cream cone: melting

B) Fog is created by using dry ice:  sublimation

C) Frost forms on trees on a very cold day: deposition

D) The mirror gets fogged up when you breathe on it: condensation

E) Your wet hair dries after a few minutes: evaporation

F) Liquid glass cools and hardens : freezing

Explanation:

Sublimation process where solid state changes to gaseous state by escaping liquid state.

Deposition process where gaseous state changes to solid state by escaping liquid state.

Condensation process where gaseous state changes to liquid state.

Melting is the process where solid state changes to liquid state.

Evaporation process is a process where liquid state changes to gaseous state.

Freezing is the process in which liquid changes to solid state.

Answer:

(A) A spore is a diploid cell that is produced by mitosis.

Explanation:

It best describes the different features of plant life cycles.

:)

A spore is a diploid cell that is produced by mitosis describe the different feature of plant life cycles.

Mitosis, a process of cell duplication, or reproduction, during which one cell gives rise to two genetically identical daughter cells.

Spore, a reproductive cell capable of developing into a new individual without fusion with another reproductive cell. Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes.

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Answer:

B: Fungi that are associated with bread mold

Explanation:

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Answer: Option (B) is the correct answer.

Explanation:

It is known that salt water contains high amount of sodium chloride (NaCl).

Also, when it rains then minerals from the rocks are washed or carried away by rain water. Therefore, this rain water passes through various routes and finally reaches to the ocean.

Therefore, the minerals from rocks are deposited in the ocean.

On the other hand, density is defined as mass divided by volume.

Mathematically,     Density = [tex]\frac{mass}{volume}[/tex]

Also, it is known that 1 atmosphere equals 14.69 pound per square inche and not equals to 20 pounds per square inch.

Thus, we can conclude that the true statement is dissolved minerals from rocks are deposited in the ocean.