Answer:
e. All of the answers are correct.
Explanation:
The major histocompatibility complex (MHC) is a locus that contains several polymorphic genes. These genes are known to encode different components of the immune system, especially cell-surface proteins which present antigens to the T cell receptors during adaptive immune responses. The MHC genes are classified into Class I, Class II and Class III:
1- MHC class I genes encode cell surface molecules that present peptides (antigens) to cytotoxic T lymphocytes (i.e., killer T cells)
2- MHC class II genes encode cell surface molecules that present antigens to CD4+ T cells
3- MHC class III genes encode proteins that are not involved in antigen presentation (i.e., components of the complement cascade, cytokines, etc)
how is a bacterium different from ours
Answer:
Viruses are tinier than bacteria. In fact, the largest virus is smaller than the smallest bacterium. All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host.
Explanation:
Answer:
Viruses are tinier than bacteria. In fact, the largest virus is smaller than the smallest bacterium. All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host.
Explanation:
If a cell in G1 has 20 chromosomes, then at the end of meiosis I there will be _________ chromosomes in each daughter cell, and __________ sister chromatids in each daughter cell.
Answer:
10 chromosomes
20 chromatids
Explanation:
Meiosis is the process by which sexually reproducing organisms produce gametes for sexual reproduction. Meiosis, which reduces the chromosomal number of the parent cell by half, occurs in two stages namely: meiosis I and meiosis II.
Meiosis I is where the actual reduction in chromosomal number takes place because homologous chromosomes are separated in this stage. For example, a cell in G1 that has 20 chromosomes will have 10 chromosomes in each daughter cell at the end of meiosis I.
Since, DNA replication occurs in the S-phase, sister chromatids are formed for each chromosome. Hence, there would be 20 sister chromatids joined together by a centromere at the end of meiosis I.
these minerals are formed through crystallization of molten materials which statement best describes these two minerals?
the mineral on the left formed from lava
the mineral on the right formed from magma
the mineral on the left has smaller crystals in the middle on the right
the mineral on the left cool more slowly than the mineral on the right
Answer:
The answer is D.
Explanation:
Just took the quiz and got it correct.
The correct statement is that the mineral on the left cool more slowly than the mineral on the right
The crystallization process is simply known as the way through which atoms are arranged to form a material with a crystal structure.
A ways minerals is formed is by:
Crystallization of magma or lava
The minerals that forms igneous rocks often solidify or freeze at different temperatures.
Magma are created underground, in the lower crust or upper mantle, due to the intense heat there.
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According to the graph, how many billions of US dollars were invested in sustainable energy in 2006?
a.
28
c.
71
b.
50
d.
0
Answer:
50
Explanation: :)
How many nitrogen atoms are there in 5 molecules of N2H4
Hint: The symbol for nitrogen is N
10
In one molecule of N2H4 (Hydrazine), there are two nitrogen atoms.
So, to find how many there are in five molecules, multiply by five.
2 x 5 = 10
Put the steps in the proper order to explain the flow of information from the DNA sequence to a functional protein.
1. The codon sequence in mRNA determines the amino acid sequence in a polypeptide.
2. Each codon in mRNA codes for a specific amino acid.
3. The sequence of amino acids in a polypeptide determines how the protein will fold and possibly bind with other polypeptides to form a mature protein.
4. The final structure of a protein determines its function.
5. Each three nucleotides in the gene template DNA codes for a three nucleotide codon in mRNA.
Answer:
5. Each three nucleotides in the gene template DNA codes for a three nucleotide codon in mRNA.
2. Each codon in mRNA codes for a specific amino acid.
1. The codon sequence in mRNA determines the amino acid sequence in a polypeptide.
3. The sequence of amino acids in a polypeptide determines how the protein will fold and possibly bind with other polypeptides to form a mature protein.
4. The final structure of a protein determines its function.
Explanation:
The process of gene expression follows the central dogma of biology I.e. Gene (DNA) --> mRNA ---> Protein. The process of gene forming mRNA is called transcription while the process of mRNA forming protein is called translation.
Based on this, the order of the flow of information from the DNA sequence to a functional protein is:
- Each three nucleotides in the gene template DNA codes for a three nucleotide codon in mRNA (transcription).
- Each codon in mRNA codes for a specific amino acid.
- The codon sequence in mRNA determines the amino acid sequence in a polypeptide (translation).
- The sequence of amino acids in a polypeptide determines how the protein will fold and possibly bind with other polypeptides to form a mature protein.
- The final structure of a proteiin determines its function.
The order is 'three nucleotides in DNA codes for a codon', 'each codon codes an amino acid', 'codon sequence determine amino acid sequence', 'amino acids determine protein folding' and 'final protein structure determines its function'.
During gene transcription, a fragment of DNA referred to as 'gene' is used as a template to create an mRNA, which is then used to synthesize a polypeptide.
The triplets of nucleotides or 'codons' in the mRNA sequence determine the amino acid sequence in the nascent polypeptide chain.
The synthesized protein is then folded in the endoplasmic reticulum (ER) and thus adopts its three-dimensional (3D) conformation.
Protein folding is achieved by specific proteins called chaperones that help to correctly fold the protein, which adopts a mature conformational active state.
In conclusion, the order is 'three nucleotides in DNA codes for a codon', 'each codon codes an amino acid', 'codon sequence determine amino acid sequence', 'amino acids determine protein folding' and 'final protein structure determines its function' (order 52134).
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most bacteria reproduce by
Answer: Most bacteria rely on binary fission for propagation.
Explanation: Hope this helps have a great day!
Answer: Most bacteria reproduce by binary fission, also know as propagation.
What type of cell is shown in the model?
A. Bacterial cell
B. Eukaryotic cell
C. Plant cell
D. Prokaryotic cell
Answer:
it is a Eukaryotic cell (B)
Explanation:
by process of elimination we can limit it down to B and D, a prokaryotic cell would look nothing like this so therefore it is B
The cell shown in the figure is a model of an eukaryotic cell. An eukaryotic cell consists of all the cell organelles and a well-defined nucleus. Thus, the correct option is B.
What is Eukaryotic cell?
An eukaryotic cell is also known as a true cell. These cells contain all the membranous cell organelles such as mitochondria, chloroplast, etc. and a true well-defined nucleus which are absent in the prokaryotic cell. An outer cell wall or cell membrane is present which encloses the protoplast (living matter) of the cell.
All the animals and plants are made up of eukaryotic cells. These cells contain all the organelles and hence are capable of independent existence. The genetic material is present in the form of DNA (deoxyribonucleic acid) in the nucleus of cells.
Therefore, the correct option is B.
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PLEASE HELP ME WITH THIS QUESTION
Answer:
D
Explanation:
que estan ELABORANDO los medicos para hacer la cura del coronavirus...AYUDA
Answer:
Vacunas
Explanation:
Las vacuna son preparaciones seguras obtenidas mediante numerosos ensayos clínicos, cuyo objetivo es generar inmunidad contra una enfermedad mediante la producción de anticuerpos. Basicamente, existen tres tipos de vacunas: vacunas atenuadas, vacunas de ARN mensajero y vacunas de terapia genética. En primer lugar, las vacunas atenuadas están desarrolladas usando fragmentos del virus que provoca la enfermedad, lo cual se conoce como vacunas atenuadas porque están fabricadas con virus atenuados/inactivados. Por otra parte, en los últimos años, han sido desarrolladas vacunas derivadas de ARN mensajeros (ARNm) las cuales permiten sintetizar una proteína específica del virus (antígeno) y de este modo generar una respuesta inmune que permanecerá ante una posible infección. Finalmente, las vacunas de terapia génica utilizan como vector un virus que no se integra al genoma pero que es altamente estable, como por ejemplo un adenovirus (un virus del resfriado común), el cual permite introducir en las células la información genética del patógeno a fin de generar proteínas virales específicas capaces de desencadenar una respuesta inmune, es decir, generar anticuerpos específicos, contra el virus.
the girl was observing a slide o
f muscle under microscope identified the muscle of striated on the basis of
Answer:
muscles carry lines, the texture is often different by that of tissue that is visible to the eye.
Explanation:
ligase nickname and function!
Answer:
Nickname=DNA or synthatese
Explanation:
Function =it is used in cells to join together the okazaki fragments which are form on the lagging strand during DNA replication.
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called(1 point)
A. vegetative reproduction.
B. fragmentation.
C. binary fission.
D. tuber reproduction.
Answer:
C
Explanation:
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called vegetative reproduction.
Tissue collections that carry out specific functions are called _________
A. Cells
B. Organs
C. Organ Systems
D. Organisms
Answer:
B. organs is the right one
Explanation:
brainliest plss!!!!!1
Answer:
B. Organs
Explanation:
Cells make up tissues. Tissues make up organs. Organs then make up organ systems, which make up organisms. Hope this helps!
If one strand of DNA has the base sequence TTCCGGAA The complementary strand has which of the following sequence?
Answer:
If a DNA strand has the base sequence TTCCGGAA the complementary strand has the sequence AAGGCCTT.
Explanation:
A DNA molecule is constructed from sequences of its four nitrogenous bases: adenine, thymine, guanine and cytosine. Since DNA is made up of two strands, the sequence of nitrogenous bases of one strand is complementary to the other .
The complementarity of the bases is a characteristic of the nitrogenous bases in the nucleic acids to combine with their complementary base, which is the same as saying that purines complement with pyramidines.
Adenine is combined with Thymine A=T Cytosine is complemented with Guanina C≡GIn this way, given a sequence on a DNA strand :
T-T-C-C-G-G-A-A
The complementary strand will have this sequence:
A-A-G-G-C-C-T-T
sort Desk Clerk Work
According to O'NET, what are common work styles
needed by Hotel, Motel, and Resort Desk Clerks?
Check all that apply.
concern for others
stress tolerance
aggressiveness
cooperation
avoidance of others
dependability
Answer:
Concern for others. Stress tolerance. Cooperation. Dependability. abde
What happens to the actin and myosin during a muscle contraction?
Answer:
Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.
help me w this pls would mean a lot
Answer D
Explanation: All the previews could cause it
ALOT OF POINTS MARKING POEPLE AS BRAINLIST
Look at the graph. Explain how the two population are related to each other
both species had growth in number within the same time period
Observe Record the appearance (colors,
textures, etc.) of the reactants in the data table.
What else can the copper react with?
Answer:
Oxygen, air, oxygen from the air, oxygen from air and the second part is synthesis
Explanation:
Got it on edge
Answer:
Oxygen, air, oxygen from the air, oxygen from air and the second part is synthesis
Explanation:
dude above jus said it
The genotype dd is considered what? (2 words)
Answer:
recessive hope this is helps
Explanation:
Answer:
recessive dimple
Explanation:
What are some of the interactions the respiratory
systems has with other body systems?
Answer:
The respiratory system interacts with the circulatory system by replenishing the blood flow from the heart with fresh oxygen, and taking out waste gases like CO2 from the blood.
Explanation:
Any interaction of the respiratory system with another system would be any function where both systems are involved. Hope this helps!
ALOT OF POINTS MARKING POEPLE AS BRAINLIST ⚠️⚠️
7. List 5 factors, other than the lynx, that could change the number of hares.
Answer:
1. Weather
2. Humans
3. Grass
4. Lynx's Predators
5. Other Grass eaters
Which numbered organelle produces ATP during cell respiration? 1,7,9,13
Answer:
9
Explanation:
What is the most common weather patterns for the tropics?
Your answer
Send me a copy of my responses.
Submit
Predict what would happen if chemical energy is burned?
Energy is converted to mechanical energy.
The amount of chemical energy starts to decrease.
Energy is destroyed.
Sound energy can be created through an explosion.
Answer:
The amount of chemical energy starts to decrease.
Explanation:
Hope this helped
what risk does liquefaction pose during an earthquake?
Answer:
It can turn loose soil into a liquid during an earthquake. supports of buildings, bridges, pipelines, and roads, causing them to sink into the ground, collapse or dissolve.
Explanation:
One of the reasons you might struggle to lift a heavy object with your arm fully extended is because:_______.
Answer:
the overlapping decreases between the thin and thick filaments.
Explanation:
When w extend our hand or arm to the full and try to lift any heavy object, we are unable to lift the object inspite of applying all our force. We struggle hard to lift the object with our fully extended arm because when we extend our arm fully it decreases the overlapping of our thin and the thick filaments of our muscles which makes it difficult to lift. In other words, the resting length of our arm is the optimal length to generate force.
Select the correct answer.
Which statement about the scientific method is true?
A.
Opinions can be scientifically tested.
B.
Scientific theories are tentative and change as new data emerges.
C.
Hypotheses can be proved through experimentation.
D.
Facts can be scientifically tested.
it's D but I might be wrong
Answer:
C
Explanation:
In science, a hypothesis is an idea or explanation that you then test through study and experimentation. Outside science, a theory or guess can also be called a hypothesis.
Many scientists start with this as a need you make a prediction and base it around your experiment to prove your correct.
Hope this helped
(It could also be D but I'm more positive on C)
Multicellular organisms (like us) increase the number of their cells through cell division. One cell divides (parent cell) and becomes two new cells (daughter cells).
Question 20 options:
True
False
Answer: The answer is false
Explanation: