Answer:
cell membrane: provides protection for a cell . It also provides a fix environment inside the cell and the membrane has several different fonctions . One is to transport nutrients into the cell and also transports toxic substance out of the cell.
cell wall: cell wall is a structual layer sorrounding some types of cells , just outside the cell membrane . it can be tough , flexible ,and sometimes riding. it provides the cell with both structual support and protection , and also acts as a filtering machine.
3. What does the salt do?
4. What was the purpose of cooling the mixture?
5. What does the cold ethanol do?
6. Why can't we use room temperature ethanol?
7. Why are strawberries classified as octoploids?
Answer:
3.You might think this should mean you need to cut out salt completely, but salt is actually an important nutrient for the human body. Your body uses salt to balance fluids in the blood and maintain healthy blood pressure, and it is also essential for nerve and muscle function.
4.Cooling the mixture is to prevent the DNA from being degraded by the heating.
5.The ethanol pulls water from the DNA molecule so that it then collapses in on itself and precipitates. The DNA will become visible as white mucous strands that can be spooled with the wooden applicator stick.
6.The colder the ethanol is the greater the amount of DNA that is precipitated. (You could try having some of the students use room temperature ethanol and see if the amount of DNA they can spool is the same or less than that for the groups using the ice-cold ethanol.
7.The reason is every strawberry seed contains different genetic material, the product of a myriad of potential gene combinations. Because the genetics of strawberries are so diverse (humans are diploid, strawberries are octoploid)
Explanation:
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in which of the glands are ducts located between lobules.
Answer:
Interlobular -- Located between lobules, within the thin connective tissue septa that separate lobules. All interlobular ducts are excretory.
why is staining done
Answer:
The most basic reason that cells are stained is to enhance visualization of the cell or certain cellular components under a microscope. Cells may also be stained to highlight metabolic processes or to differentiate between live and dead cells in a sample.
Choose the word that best completes each sentence. Angiosperms’ anchor them in the ground and absorb water for the plant. Their stems provide support to the plant and connect the roots and leaves. Their capture the sun’s energy and use it to make food through the process of photosynthesis. Angiosperms’ contain the reproductive parts of the plant. Their protect and help spread the seeds.
Answer:
Root anchor them in the ground and absorb water for the plant. Woody stem provides support to the plant and connect the roots and leaves. Leaves capture the sun's energy and use it to make food through the process of photosynthesis. Flowers contain the reproductive parts of the plant. fruite protect and help spread the seeds.
Explanation:
Answer:
roots, leaves, flowers, fruits
Explanation:
How can you use genetics to study human inheritance?
Answer:
by analyzing how genes influence the development of phenotypic traits, i.e., by determining the association between phenotypic traits and changes in DNA sequence
Explanation:
Genetics is a discipline that studies how genetic variation, i.e., the variation in the Deoxiriibunicleinc acid (DNA) molecule, is associated with the transmission of heredity, and how the environment influences this process. The DNA is a molecule that carries the instructions to perform all metabolic functions (eg., reproduction, development, growth, etc). Thus, advancements in genetics enabled us to decipher how phenotypic traits pass from parents/ancestors to their offspring/descendence. Genes are segments of DNA that carry the information (genetic information) to determine each phenotypic trait. During reproduction, genes are passed from one generation to the next, thereby transmitting this information across generations.
What leads to genetic recombination in Archaebacteria?
budding
endospore
conjugation
binary fission
Answer:
Binary Fission I believe.
What will happen if you heat a liquid to high temperatures?
Question 3 options:
It will become a colloid.
It will become a solid.
It will become plasma.
It will become a gas.
Answer:
D. It will become a gas.
Explanation:
I go to k12 and got it right. Science Unit 2 Test.
Which is a property of a mineral?
A) density
B) odor
C) size
D) age
Help me with number 6 please its esay
Answer:
A
Explanation:
Learnt this 2 yrs ago in geography class
Answer:
a
Explanation:
Differentiate between cell mass and cell number
Answer:
Measurement (Count) of Cell Numbers:
1. Breed Method:
A known volume of microbial cell suspension (0.01 ml) is spread uniformly over a glass slide covering a specific area (1 sq. cm). The smear is then fixed by heating, stained, examined under oil immersion lens, and the cells are counted.
Customarily, cells in a few microscopic fields are counted because it is not possible to scan the entire area of smear. The counting of total number of cells is determined by calculating the total number of microscopic fields per one square cm. area of the smear.
Answer:
cell mass: The total mass of all the cellular elements in the body which constitute all the metabolically active tissue of the body
Cell number: The sequence of numbers or characters, that when dialed, connects to a particular cellular telephone
Explanation:
The diagram below shows a model of four waves. An image of four waves labeled W, X, Y, Z is shown. Wave W has the smallest distance from crest to crest across the length of the wave. Wave Z has the largest distance from crest to crest across the length of the wave. Wave X has a larger distance from crest to crest than Wave W but are not as far apart as Wave Y. Wave Y has a larger distance from crest to crest than Wave X but not as far apart as Wave Z. Which wave has the lowest frequency? W X Y Z
Answer:
The Answer is D(Z)
Hope this helps-KayPea
Explanation:
Answer:
The Answer is D(Z)
Explanation:
Two organisms within the same family can be organized into several related
orders
kingdoms
phylum
genus
Answer:
Phylum and Kingdoms
Hopefully this is right.
Transcription is the beginning of protein synthesis. Some of the following sentences describe events that occur during the process of transcription in eukaryotes. Determine which sentences describe steps in the process of transcription, and then place them in the chart in the order that they occur.
Answer: 1-the enzyme separates... 2.the enzyme rna polymerase binds... 3.rna polymerase... 4. The rna molecule (called a transcript)...
Identify this molecule. What is it the monomer of? This is an amino acid, and it is the monomer of a Protein. This is a nucleotide, and it is the monomer of DNA. This is a nucleotide, and it is the monomer of a Protein. This is an amino acid, and it is the monomer of DNA.
Answer:
This is the monomer of DNA
Explanation:
All three of these groups help make up the component DNA.
Which of the following is another way to refer to sex cells
a. gametes
b. sex cells
c. somatic cells
d. mitosis
Answer:
a
Explanation:
zI did this the other day.... pretty weird but ok!!!!
Pls help pls pls pls pls pls pls pls pls 6th grade science 30 points
Desiccation resistant spores, protective and complex reproductive organs, and embryos nourished by parental tissues enable land plants to ______.
Answer:
to adapt to dryland conditions
Explanation:
The main groups of land plants are vascular plants and they have developed diverse adaptations to survive on land, especially in climatic zones where drought and high temperatures are common. Some of the most important plant adaptations to land ecosystems include, among others, the development of a cuticle to prevent water loss, stomata capable of regulating water evaporation, desiccation-resistant spores coated in sporopollenium polymer, etc. Moreover, in seed plants, which are considered to be the most evolved vascular plants, the endosperm tissue produced inside the seeds is nourished by the parent sporophyte during the first stages of plant development.
Desiccation resistant spores, protective and complex
reproductive organs, and embryos nourished by parental
tissues enable land plants to adapt to dry conditions.
What is Dessication?
This is the process in which a substance dries up as a result of
loss of moisture.
In plants, resistant spores, protective and complex
reproductive organs, and embryos nourished by parental
tissues which helps to prevent desiccation and ensure that the
seeds survive harsh conditions thereby facilitating
reproduction.
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Two models, process A and process B, are shown here as two different potential pathways for viral replication. Evaluate the statements below and select ALL of the statements that are supported by the processes modeled here.
Answer:
the and anwers is b Process A is a lytic cycle that results in the host cell's death, d Both processes involve a viral genome being replicated inside of a host cell and e Process B allows the viral genome to be dormant and reside within the host's genome.
Explanation:
just did the usa test prep
What happens when the slightest change happens in an ecosystem?
A. It affects the whole system.
B. It affects part of the system.
C. The ecosystem ignores the change.
D. Nothing happens.
Which of the following is true regarding the process shown below?
A. This process is cloning and involves the production of RNA from protein molecules.
B. This process is replication and involves the production of DNA from RNA.
C. This process is translation and involves the production of proteins from RNA.
D. This process is transcription and involves the production of proteins from DNA.
Answer:
C. This process is translation and involves the production of proteins from RNA.
Explanation:
- In the process of protein synthesis, the first step is called “transcription”. In transcription, the mRNA (messenger RNA) unwinds DNA base pairs, and pairs it with the single strand of RNA (A,U,C,&G) . Then the mRNA moves out of the nucleus and into the cytoplasm to ribosome. That process is called “translation”. In translation, there is a molecule called tRNA (transfer RNA). There is an amino acid which corresponds to the base pairs of RNA in top, which will create a chain of amino acids.
Answer:
Translation
Explanation:
Removes water from waste and puts it back into the body; waste turns into solid here. *
Species can change over time and adapt to their environment.
A. True
B. False
Answer:
True
Explanation:
This statement is true. A species can always change over time and adapt to their environment.
What are species?A species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. It is a class of plants or animals whose members have the same main characteristics and are able to breed with each other.
Moreover, it is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behavior or ecological niche.
Hence, species can change over time and adapt the conditions according to their environment.
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To a large extent, a protein's function is dependent upon its shape. What determines a protein's shape?
The number of amino acids
O The sequence of amino acids
O The number of peptide bonds
O The location of the active site
Answer:
The sequence of amino acids
Explanation:
give two reasons that a particular molecule may be unable to cross the plasma membrane
Answer:
The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot.
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Answer:
b
Explanation:
It's part of RNA
Answer:
B
Explanation:
When DNA goes to RNA, you have to find the matching pair. G goes to C, A to U, T to A, and C to G. Ask for any clarification!
How are the electrons in the PS II system replaced?
Answer: Photosystem I obtains replacement electrons from the electron transport chain. ATP provides the energy and NADPH provides the hydrogen atoms needed to drive the subsequent photosynthetic dark reaction, or Calvin cycle.
Explanation:
can someone explain what's going on in the graph?
What living things are important for the frog’s survival?
Can you pls list three?
Answer:
food, water, habitat
Explanation:
Answer:
Frogs need suitable land and freshwater habitats in order to survive. They also have highly permeable skin that can easily absorb bacteria, chemicals and other toxins.
What is the process by which new oceanic crust is?
Explanation:
Subduction happens where tectonic plates crash into each other instead of spreading apart. At subduction zones, the edge of the denser plate subducts, or slides, beneath the less-dense one. The denser lithospheric material then melts back into the Earth's mantle. Seafloor spreading creates new crust.
which body structure have walls one cell thick
Answer:
CapillariesExplanation:
Capillaries. Capillaries connect the smallest branches of arteries and veins. The capillaries are where molecules are exchanged between the blood and the body's cells. The walls of capillaries are just one cell thick.The only body structure that has walls one cell thick is capillaries.
What are capillaries?Capillaries, the blood vessels in our bodies are so minuscule that red blood cells can only travel through them in a line. Comprised of a layer of cells capillaries facilitate the exchange of crucial substances like oxygen carbon dioxide, nutrients and waste materials, between the bloodstream and the surrounding tissues.
With the above details we can conclude that the body structure that has walls one cell thick is capillaries.
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