Diatoms have cell walls composed of _____.
silicon dioxide
carbon dioxide
chitin

Answers

Answer 1
Answer:

Answer:

silicon dioxide is the correct answer.

Explanation:

Diatoms are the unicellular algae, found in waterways, soil, and ocean.

diatoms cell walls are made up of silica dioxide which is called frustule because the cell wall is composed of silicon dioxide it makes the cell wall diatoms transparent, which helps them to produce more foods.

As the diatoms cell wall is composed of silica it is used as a silica source, to treat constipation and cholesterol level and also to improve the health by removing the dead cells.

Answer 2
Answer: Diatoms have cell walls composed of Silicon Dioxide.

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When marking an animal for the mark/recapture technique, what can a scientist do to ensure the mark does not lower the organism’s chance of survival, and thus throw off the population estimate?
3. For your organ system, describe how the system works at the organ level.

After school, Kai feels hungry and tired. He finds some sugar cookies in the cabinet and finishes the whole package.Which statements best describe the role of glucagon and insulin in this scenario?
O Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. Insulin
was secreted after he ate the cookies because his blood glucose was high.
O Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. Glucagon
was secreted after he ate the cookies because his blood glucose was high.
O Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he
ate, insulin from the cookies increased his blood sugar levels.
O Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate,
glucagon from the cookies increased his blood sugar levels.

Answers

During  process of digestion which takes place in digestive tract statement which describes role of glucagon and insulin is glucagon was secreted by  pancreas before he ate the cookies because his blood glucose was low. Insulin was secreted after he ate cookies because his blood glucose was high.

What is digestive tract?

It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.

The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.

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Answer: Option A) Glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. Insulin was secreted after he ate the cookies because his blood glucose was high.

Explanation:When Kai was hungry and his blood glucose level was decreasing, glucagon is the hormone which was secreted by the islets of pancreas to increase the blood sugar levels in his body. Glucagon forces the liver to release the stored glucose in it, which increases the blood glucose level in the body. When Kai ate the sugar cookies there was enough of blood glucose available for his body, also it exceeded the requirement and went high. Insulin was then secreted to control this excess glucose from the islets of pancreas. As it helps the body cells to absorb the glucose and lowers the amount of glucose in the blood. It makes the cell available with the glucose to produce energy and perform their activities.

In short, glucagon and insulin both are secreted by the same organ which is islets of pancreas. But they differ in their function, glucagon increases the blood glucose when the body needs it, whereas insulin helps to absorb the excessive glucose and stores that in the body. Both are the hormones which help in regulating the body glucose levels.

A lack of iron in the blood is an unhealthy condition known as __________________A : Scurvy
B : Rickets
C : Diabetes
D : Anemia
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Answers

d anemia emia means blood condition

the answer is d anemia

PLEASE HELP IM BEGGING YOUThe arrows in the diagrams represent the direction of movement of a certain type of molecules through the cell membrane of two different cells. The dots represent the relative concentrations of these molecules. Which processes are illustrated in the diagrams?

a

Cell A shows phagocytosis and Cell B shows diffusion

b

Cell A shows pinocytosis and Cell B shows osmosis

c

Cell A shows active transport and Cell B shows diffusion

d

Cell A shows dehydration synthesis and Cell B shows the circulation

Answers

Cell A shows active transport and Cell B shows diffusion in the given diagram.

What are the types of transport methods?

  • All higher organisms, including humans, animals, and plants, go through a process called transportation that is necessary, natural, and part of their physiological makeup.
  • To support life, this interaction is significant as it capabilities by continually shipping, different fundamental materials to and from all pieces of the body including cells, tissues, and organs.
  • Water, hormones, gases, mineral nutrition, organic material, and other things are the primary essential materials.
  • An organism's various modes of transportation include:
  • Active transport
  • Passive transport
  • Facilitated transport
  • Diffusion.
  • The term "active transport" refers to a process in which molecules use external energy to move from a lower concentration area to a higher concentration area against a gradient or obstacle.
  • Any substance's overall movement from a higher concentration area to a lower concentration area is known as diffusion.
  • This can occur between cells or within them. Due to the random movement of their particles, only gases and liquids experience diffusion.
  • It is an essential biological process.
  • It is how things enter and exit cells.
  • It occurs naturally and does not call for any energy.
  • The container or the particles themselves come into contact with one another.
  • In the end, the particles cover the entire container. There is no stirring, shaking, or wafting during diffusion.
  • We refer to this as the concentration gradient down because diffusion is the movement of particles from a higher concentration to a lower concentration.

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Answer:

C I think

Explanation:

When we begin to get dehydrated, we usually get thirsty, which causes us to drink fluids. Is thirst part of a negative or a positive feedback system

Answers

Answer:

Negative Feedback

Fill in the blanks of the following sentences. A chromosome contains one long __________ molecule. Each gene in this molecule gives the instructions for making a __________________. Both chromosomes in a pair of ______________________ chromosomes have the same ___________, but the two chromosomes may have different _________________. Chromosomes that are not homologous have different ______________ which give the instructions for making different kinds of proteins.

Answers

A chromosome contains one long DNA molecule.Each gene in this molecule gives the instructions for making a PROTEIN.Both chromosomes in a pair of HOMOLOGOUS chromosomes have thesame GENE, but the two chromosomes may have different ALLELES. Chromosomes that are not homologous have different GENE which give the instructions for making different kinds of proteins.

1. A chromosome contains one long DNA molecule.

DNA or deoxyribonucleic acid is a fundamental and essential macromolecule that is built from the chain of nucleotides. A nucleotide consists of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group. DNA carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms. It is organized (packed) into structures-chromosomes and during cell division, these chromosomes are duplicated in the process of DNA replication. The process of replication provides each cell with its own complete set of chromosomes.

 

2. Each gene in this molecule gives the instructions for making a PROTEIN.

The genetic information in a genome is held within genes. Genes are a sequence of DNA that codes for a molecule that has a function, and usually, it is a protein. During gene expression, the DNA is first copied into RNA in a process called transcription. Then, synthesized RNA can be directly functional or be the template for a protein that performs a function. Synthesis of protein from RNA is a process called translation.

 

3. Both chromosomes in a pair of HOMOLOGOUS chromosomes have the same GENE, but the two chromosomes may have different ALLELES.

Homologous chromosomes are a set of one maternal and one paternal chromosome. Those chromosomes pair up with each other inside a cell during meiosis. Homologs have the same genes in the same loci but the alleles may be different, resulting in different phenotypes of the same genes. During the meiosis, the process of crossing over occurs when homologous chromosome pair exchange parts of DNA with one another.

 

4. Chromosomes that are not homologous have different GENE which gives the instructions for making different kinds of proteins.

Non-homologous chromosomes differently from homologous consist of alleles of different types of genes. Non-homologous chromosomes do not pair during meiosis and the shape of the chromosome, the length of the arms and the position of the centromere, is different among those chromosomes.

The substance that typically provides rigidity to fungal cell walls, and is also found in the external skeletons of insects and other arthropods, is called ____.

Answers

Answer:

Chitin

Explanation:

Chitin is a natural biopolymer that is made of the N-acetylglucosamine, modified glucose.

Chitin is an important polymer mainly for the fungi and the arthropod insects as it is present in the cell wall of the fungi and the exoskeleton of the insects.

The chitin provides a protective function to this organism that the digestive enzymes cannot degrade this chitin but only the symbiotic bacteria can digest eat therefore they are sometimes avoided to be eaten.

Thus, chitin is the correct answer.