may occur in oceans
is a type of transform boundary
is a region where earthquakes occur
The first step in DNA replication is
The first step is to basically sort of “unzip” the double helix.
Cells sometimes use passive trarert
to move Dholecules across their
membranes. The rate at which a cell
engages in passive transport is
determined by -
A the number of vacuoles that the
cell contains.
B the composition of the cell
membranes.
C the size of the cell's chloroplasts.
D the amount of energy that the cell
generates.
Many different types of mutations can occur within the body. Cystic fibrosis is a genetic disorder that is caused by different mutations within the CFTR gene. One mutation in the CFTR gene that leads to cystic fibrosis causes translation to end earlier in the gene sequence. Which type of mutation causes this translation error that leads to cystic fibrosis?
silent
missense
nonsense
deletion
Answer:
Deletion
Explanation:
I think it is the last one
Deletion
If it really helped please give me brainliest
A nonsense mutation is one mutation in the CFTR gene that leads to cystic fibrosis causes translation to end earlier in the gene sequence.
Cystic fibrosis is a genetic disorder that is caused by different mutations within the CFTR gene.
The CFTR gene codes for the CFTR protein whose function is as an anion channel (chloride ion) which helps control the movement of water in and out of the membrane of cells that are specialized to produce mucus, sweat, saliva, tears and digestive enzymes
When CFTR protein is defective or absent, thick, sticky mucus accumulates in these cells, obstructing the airways and glands.
The most common mutation of the CFTR gene is a deletion whereby the codon for the amino avid phenylalanine is deleted resulting in the production of a defective CFTR protein.
Another form of mutation in the CFTR gene is a nonsense mutation in which a stop codon is inserted in the middle of the gene resulting in the production of a shortened CFTR protein, which is then degraded by the cell.
Therefore, a nonsense mutation in the CFTR gene leads to cystic fibrosis by causing translation to end earlier in the gene sequence.
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all livings things are?
The mutagens that result in cancer damage DNA by
Answer: BRCA1, BRCA2, and p53
Explanation:
If a person has an error in a DNA repair gene, mistakes remain uncorrected. Then, the mistakes become mutations. These mutations may eventually lead to cancer, particularly mutations in tumor suppressor genes or oncogenes.
True/False: Canada is considered to be part of the continent of North American *
25 points
True
False
Answer:
True
Explanation:
In contrast to the common definition of "North America", which encompasses the whole continent, the term "North America" is sometimes used to refer only to Mexico, Canada, the United States, and Greenland. The term Northern America refers to the northernmost countries and territories of North America: the United States, Bermuda, St. Pierre and Miquelon, Canada and Greenland. The largest countries of the continent, Canada and the United States, also contain well-defined and recognized regions.
plz mark as brainliest
Answer:
true
Explanation:
Why should you never smell a chemical directly?
A. Many chemicals have no smell.
O B. All chemicals smell the same.
C. You cannot learn anything by smelling.
D. Some chemicals can hurt your windpipe.
Answer:
D
Explanation:
Some chemicals can hurt your windpipe
Answer:
D
Explanation:
by directly smelling something you are ingesting tiny particles of it, which is why directly smelling a chemical is a bad idea.
Do you think partial melting will occur if there is too much amount of water in the subduction zone?
Answer:
Water plays a crucial role in the melting of Earth's mantle. ... At oceanic subduction zones, water released by the subducted slab may induce melting of the overlying mantle wedge or even the slab itself, giving rise to arc magmatism, or may evolve into a supercritical fluid.
How might stem cells be a solution to paralysis caused by spinal injuries?
Answer:
transplantation of stem cells or stem-cell-derived cells may contribute to spinal cord repair by: Replacing the nerve cells that have died as a result of the injury; ... Preventing spread of the injury by suppressing the damaging inflammation that can occur after injury.
Explanation:
Which of the following correctly illustrates a dipeptide and an amino acid in the optimal position to form a tripeptide?
The options in the question are shown in the image attached to this answer
Answer:
A
Explanation:
A peptide bond is formed between a carboxylic acid and an amine group. These two functional groups must be in the correct orientation before they can react to form the peptide bond.
If we study the images closely, only the amine group and carboxylic acid in option A are correctly positioned for reaction to take place leading to the formation of a third peptide bond.
Amino acids connect by peptidic bonds to form the linear structures of proteins. In the peptidic bond, the amino group joins the carboxylic group, and a water molecule is released. Among the options, A is the correct one.
-------------------------------------------------------
Amino acids are organic molecules.
They are composed of a central carbon, one hydrogen atom, one carboxyl group (COOH), one amine group (NH₂), and one R group. The composition of the R group is what makes them different from each other.
Proteins are amino acid polymers linearly arranged and connected by peptidic bonds.
The number of amino acids composing the chain and their order determines the primary structure of the protein.
The protein is synthesized from the amino terminus to the carboxy terminus.
The peptidic bond is the union of two amino acids by their carboxyl and amine groups.
When they get together, a water molecule is released, producing a covalent bond ⇒ CO-NH.
Peptidic bonds only form linear structures, with no ramifications, known as peptides.
In this way, every peptide has a free carboxylic group in one extreme and a free amine group in the other extreme.
Among the given options, the correct position of the dipeptide and the amino acid to form a tripeptide is option A.
By looking carefully at the position of the molecules, we can see that this is the only option in which a carboxylic group and an amine group are facing. This orientation is the only one possible for the peptidic bond to form.COOH and NH₂ must get together, releasing a water molecule, and creating the covalent bond CO-NH.
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match the type of river to to its best description.
Answer:
Old rivers-Have many meanders
Young rivers-Carry large objects
Mature rivers-Carry medium-sized objects
The following are the correct matches:
Old rivers-Have many meandersYoung rivers-Carry large objectsMature rivers-Carry medium-sized objectsWhat are rivers?Rivers are bodies of flowing water that are typically found on the surface of the Earth. They are formed by the accumulation of precipitation, such as rain or snow, in a specific area and flow in a defined channel towards an ocean, a lake, or another river. Rivers can vary greatly in size and length, with some being just a few meters wide and a few kilometers long, while others can be several kilometers wide and thousands of kilometers long.
They are an important resource for humans and other living organisms, providing water for irrigation, drinking, and industrial uses, as well as serving as habitats for a wide variety of plant and animal life. Rivers also shape the land they flow through, eroding and depositing sediment, and creating features such as valleys, deltas and canyons.
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The cell membrane helps the cell regulate temperature, nutrient concentration and
wastes. In terms of vocabulary, the cell is maintaining:
a stimulus
a response
metabolism
homeostasis
Answer:
Homeostasis
Explanation:
Cell membranes enable organisms to maintain homeostasis by regulating the materials that may enter or leave a cell.
What is the name of the process that is cell division for the cells involved in reproduction (sperm cells in male organisms and egg cells in female organisms)?
Answer: The correct answer is Meiosis
Explanation:
I took the test
true or false :molecules of water and carbon dioxide down and used to build glucose during photosynthesis
Answer:
True
Explanation:
As has been stated, carbohydrates are the most-important direct organic product of photosynthesis in the majority of green plants using H20 and Co2. The formation of a simple carbohydrate, glucose.
35. Which statement best describes the cell membrane of a living plant cell?
A. It selectively regulates the passage of substances into and out of the cell.
B. It is composed of protein and carbohydrates only.
C. It has the same permeability to all substances found inside or outside the cell.
D. It is a double protein layer with floating lipid molecules.
Answer:
The cell membrane of a living plant cell selectively regulates the passage of substances into and out of the cell (option A).
Explanation:
The plasma membrane in a living plant cell is composed of a double lipid layer that gives it hydrophobic character and acts as a semi-permeable barrier. The partial permeability of the substances allows regulating the passage of substances from and to the interior of the cell.
At the level of the plasma membrane there are several mechanisms and transport to allow the entry of substances needed for the cell or the output of synthesized products or metabolic waste, thus regulating the passage of substance in a selective way.
Regarding the other options:
B. Plasma membranes are composed of lipids, not just carbohydrates and proteins.
C. Permeability is not for all substances, but is selective.
D. Plasma membrane is a lipid bilayer, not a double layer of proteins.
Put the following parts of a river in order from beginning to end:
A. source
B. delta
C. main river channel
D. mouth
A). A, C, B, D
B). A, C, D, B
C). D, C, B, A
D). D, C, A, B
Answer:
B
Explanation:
The river delta is created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.
You are doing a lab in science and place a piece of chocolate in the window. What will happen to the chocolate after about an hour?
will give brainliest!
a. it will stay the same
b. it will melt
c. it will turn a different color
d. it will become cold
Answer:
b
assuming the sun would be out that day, after an hour the chocolate would have melted, but both b and d would work, but b is more likely.
what characterizes an organism? check all that apply.
Answer:
1 living thing
Explanation:
When a cell gains water, what will happen to its size and mass?
Answer:
The cell will swell up and eventually burst.
Explanation:
Cells swell if there’s more salt in a cell than outside it, the water will move through the cell membrane into the cell, causing it to increase in size. if too much water gets in, the cell will burst.
explain how sea floor spreading affects the earths crust
how are infectious agents transmitted?
Answer:
they are transmitted by one person to another, like kissing, coughing, sneezing, or any physical contact from the infected person to someone who's not.
Even tho this isnt my strong suit, i know the answer. Infectious agents are transmitted by physical contact and by airborn particles.
antype of cell which carries at a particular function is known as
Answer:
tissues
Explanation:
20 POINTS!!!! Please help
Answer:
Explanation:
Try using google! slowly you will find your answer!
In which cell below would a student likely observe a cell plate during mitosis?
A: Rat muscle cell
B: onion root cell
C: human lung cell
D: alligator stomach cell
Answer:
B. Onion root cell
Which describe the particle or particles that are in the nucleus of an atom 
Answer:
The particles inside the nucleus of an atom are a proton and neutron. These two subatomic particles are determine the atomic mass of an atom. The proton identifies an atom and changes the characteristics of atoms. A proton is a positive charge and a neutron is a neutral charge
Explanation:
Which of the following shows levels of organization in living things, from smallest to largest?
A)organ - cell - organ system - tissue
B)organ system - tissue - cell - organ
C)cell - tissue - organ - organ system
D)organ system - organ - tissue - cell
Answer:
C. cell- tissue- organ- organ- system
Cell size is limited to:
a. Thickness of the cell wall
b. Size of the cell's nucleus
c. Cell's surface area-to-volume
ratio
d. Amount of cytoplasm in the
cell
Answer:
C
Explanation:
I'm pretty sure it's either C or B
Paragraph 8 is mostly about
4. What are the functions of the nucleolus? (Choose all that apply)
regulating the cell's interaction with its surroundings
beginning ribosome assembly
translating the code contained by the DNA into the proteins the cell needs for structure and function
converting energy from food into a form the cell can use
Answer:B NUCLEOLUS IS WHERE DNA IS STORED
BRAINLIEST MEEEE
Explanation:
The nucleolus is the most conspicuous domain in the eukaryotic cell nucleus, whose main function is ribosomal RNA (rRNA) synthesis and ribosome biogenesis. AKA DNA !!!!
The function of the nucleolus includes 'beginning ribosome assembly'.
The nucleoli are eukaryotic organelles located within the cell nucleus that act as ribosome factories, in which the process of transcription (i.e., RNA synthesis) occurs constantly.
The nucleolus serves to make ribosomal subunits and then it sends ribosomal subunits to different cell destinations where they form full ribosomes.
In conclusion, the function of the nucleolus includes 'beginning ribosome assembly'.
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The picture shows a cell model and the solutions
associated with it. In this situation the cell model will
Answer:
Increase in solute content
Explanation: