A CD4 cell allows HIV entry, where it multiplies. Following the CD4 cell's death at the hands of HIV, fresh HIV copies seek for additional CD4 cells to infect and re-start the cycle. HIV destroys immune system cells which aid in the body's defence against illnesses and infections.
Who defines HIV?A virus that affects the immune system of the body is the human immunodeficiency virus (HIV). Acute immunodeficiency syndrome, or AIDS, can develop if HIV is not treated. As of right now, there is no remedy that works. HIV is a lifelong condition for those who contract it.
Which stages does HIV go through?Three stages are generally experienced by HIV-positive individuals who refuse treatment. However, HIV medication can halt or decrease the disease's advance. Stage 3 AIDS progression is now less frequent than it was in the early days of HIV because to advancements in HIV treatment. Those with HIV are very contagious and have high blood levels of the virus. Flu-like symptoms are prevalent in many persons.
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What is a subduction zone and a transform boundary?
a transform fault or transform boundary is a fault along a plate boundary where the motion is predominantly horizontal. it ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.
PLEASE HELP PLEASE
What is true about Smooth muscle cells?
Inversion of DNA sequences within chromosomes is a common process in evolution. The following gene arrangements in a particular chromosome are found in four different species: First sequence: STUVWX Second sequence: UVXTSW Third sequence: UVWSTX Fourth sequence: SWVUTX Assuming that the arrangement in the first sequence is the ancestor/reference arrangement, in what evolutionary order did the four species arise, such that the fewest number of inversions occur between each species (place the first sequence as the earliest species in your ordering)2341
Answer:
The correct answer is - 1, 4, 3, 2.
Explanation:
It is given that the first sequence represents the earliest or ancestor species therefore, the first sequence would be - STUVWX
After the inversion, the highlighted sequence of the first sequence STUVWX gives rise to the second sequence as:
STUVWX
SWVUTX
Thus the second sequence after Ist inversion would be SWVUTX
2nd inversion, Third sequence:
SWVUTX
UVWSTX
Thus the third sequence after 2nd inversion is UVWSTX
3rd inversion, fourth sequence:
UVWSTX
UVXTSW
Thus, the fourth sequence after 3rd inversion is UVXTSW
A light bulb gives off 2 types of energy
a. Radiant and Thermal
b. Mechanical and Thermal
c. Potential and Mechanical
d. Thermal and Chemical
Answer:
a
Explanation:
In the case of the light bulb, electrical energy is being transformed into light and thermal (heat) energy. Different wattages and types of bulbs give off varying amounts of light and heat.
Answer:
A
Explanation:
radiant because it gives light
and thermal cause it also gives heat on contact
Help me plzzzz!!!!!!
The family tree below shows the trait of having attached earlobes. Having
attached earlobes is recessive, and having detached earlobes is dominant.
People with attached earlobes are shaded in.
I.
A
II.
III.
D
a) Describe the sex and characteristics of the person labeled A. (1 point)
Answer:
The correct answer is - male and have recessive genotype with the attached earlobe.
Explanation:
In this given pedigree of the family with the trait of the attached earlobe where attached earlobe a recessive trait shown as shaded in. In pedigree males are represented by a square and females are represented by a circle. Filled in square or circle represent that the individual has a particular trait.
The person labeled A is represented in a filled-in square box which means A is male with the trait of attached earlobes.
Answer:
Person A is a male with attached earlobes.
Explanation:
Large multicellular organisms are made of a wide variety of cell types. Do
all of the types of cells pass through the cell cycle at the same rate? *
1 point
Yes. All of the cells divide at approximately the same times throughout the life of the
organism.
Yes. All of the cells divide at approximately the same rate, although they may divide at
different times.
No. Some specialized cells, such as skin cells, divide much more rapidly than other
specialized cells
No. Some specialized cells, such as skin cells, divide much more slowly than other
specialized cells.
Answer:
Yes, All of the cells divide at approximately the same rate, although they may divide at different times
Those organisms which are made up of more than one cell are called multicellular organisms.
These are a few examples of multicellular organisms:-
PlantsAnimalsFungiMulticellularity helps them to perform various work at the same time. To maintain the same number of cells in an organism, its body starts cell division.
It is not necessary for the host to divide all the cells at the same time.
Hence the correct option is Yes. All of the cells divide at approximately the same rate, although they may divide at different times.
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balancing of chemical equation
Answer:
what are you trying to explain
Explanation:
in the question
1. Explain how the atomic number and mass number of an atom can be used to determine the number of
electrons and of neutrons respectively.
Because the total of neutron and proton/electron is the atomic mass. So if you wanna find proton/electron and you know the neutron, just minus the atomic number with the neutrom and you will get the proton
Here if you need the formula
Atomic number = Total neutron + Total proton or electron
Why are all of us considered scientists to some extent?
O A. Everyone has questions about the natural world.
O B. Everyone writes and tests hypotheses.
O C. Everyone takes measurements and collects data.
O D. Everyone performs scientific experiments.
Answer:
A
Explanation:
well most of these are ture (Only due to school) the one answer that would apply to people outside of a school setting it A
Why are feathers "easy to repair"?
Answer: The feathers are easy to repair as the cells of birds help in replacement of damaged and old feathers.
Explanation:
The follicles of the feathers have regenerating cells that help in regrowing the feathers when the feathers are damaged and require to be replaced. The regrowth of feathers is a natural process that happens in all birds. The feathers are replaced by one or two molt seasons per year. In these seasons they shed their feathers and new feathers reappear. The newly growing feathers are stiff, and hard similar to nails.
Name:______________________________ DNA Structure Student Practice (12. 1) Modified True/False Statements: If the statement true, write True in the blank. If the statement is is false, write False in the blank and correct the underlined word to make the statement true. The building blocks of DNA molecules are amino acids. DNA molecules contain a 5-carbon sugar called deoxyribose. The nitrogen bases found in DNA molecules include adenine, cytosine, guanine,
Answer:
- The building blocks of DNA molecules are amino acids. False
- DNA molecules contain a 5-carbon sugar called deoxyribose. True
- The nitrogen bases found in DNA molecules include adenine, cytosine, guanine, and thymine. True
Explanation:
The building blocks of the deoxyribonucleic acid (DNA) are nucleotides, while amino acids are the building blocks of proteins. Each nucleotide consists of one of four possible nitrogenous bases: two purines (i.e., adenine and guanine) and two pyrimidines (i.e., cytosine and thymine). In DNA, each nucleotide consists of one of these four nitrogenous bases, a five-carbon sugar molecule (called deoxyribose), and a phosphate group. The DNA molecule has a double-helix structure, where nitrogenous bases are inside the double helix while sugars and phosphates are outside. In DNA, cytosine always pairs with guanine and thymine always pairs with adenine.
With a ruler, draw a line that is 20 cm long. Divide the line into five, 4-cm segments. On a scale of each segment representing one billion years, label the following events in the history of Earth:
a. formation of the earth
b. origin of life
c. evolution of photosynthesis
d. evolution of eukaryotes
e. evolution of multi-cellular life
f. the Cambrian explosion
g. first vertebrate land animals
h. evolution of dinosaurs
i. evolution of human beings
Solution:
The first traces of the life that existed on the earth can be traced back to about as old as 4.2 billion years. It indicates that life has evolved around 200 million years ago after the first appearance of the liquid water.
The origin of the life on earth is a natural process and is a series of evolution what we see today. Firstly earth was formed by dust and smoke particles and then different forms of life began to evolved on the earth.
The events of the evolution in the history of the earth is shown on the following number line below :
Particles of weathered rock are also called
A. terracing
B. humus
C. sediments
D. abrasion
A cell has two pairs of submetacentric chromosomes, which we will call chromosomes Ia, Ib, IIa, and IIb (chromosomes Ia and Ib are homologs, and chromosomes IIa and IIb are homologs). Allele M is located on the long arm of chromosome Ia, and allele m is located at the same position on chromosome Ib. Allele P is located on the short arm of chromosome Ia, and allele p is located at the same position on chromosome Ib. Allele R is located on chromosome IIa and allele r is located at the same position on chromosome Ib. Allele G is located on the long arm (q arm) of chromosome Ia, and allele g is located at the same position on chromosome Ib. Allele N is located on the q arm of chromosome IIa and allele n is located at the same position of chromosome IIb.
Required:
a. Draw these chromosomes, identifying genes R, r, G, g, N, and n as they might appear in metaphase I of meiosis. Assume there is no crossing over.
b. Taking independent assortment and the subsequent random separation of chromosomes in anaphase I, draw the chromosomes, with genes identified, present in all possible gametes that could result once this cell completes meiosis. As above, assume there is no crossing over. Explain in your own words what is meant by independent assortment.
Answer:
Note: You will find the chromosomes and the gametes in the attached files
Chromosomes:
IA ----------G-----о---------IB -----------g-----о----------IIA --------N--------------о------R----IIB ---------n--------------о-------r----Gametes:
Gamete 1: GNR Gamete 2: Gnr Gamete 3: gNRGamete 4: gnrIndependent assortment occurs when the alleles of two or more different genes distribute in the gametes independently from each other.
Explanation:
Available data:
two pairs of submetacentric chromosomes
IA -------------------о-----------
IB -------------------о-----------
IIA ----------- ------------о------------
IIB ------------------------о------------
chromosomes Ia and Ib are homologs
IA -------------------о-----------
IB -------------------о-----------
chromosomes IIa and IIb are homologs
IIA -----------------------о------------
IIB ------------------------о------------
Allele M is located on the long arm of chromosome Ia, and allele m is located at the same position on chromosome Ib
IA -------M----------о-----------
IB -------m----------о-----------
Allele P is located on the short arm of chromosome Ia, and allele p is located at the same position on chromosome Ib.
IA -------M----------о------P---
IB -------m----------о------p----
Allele R is located on chromosome IIa and allele r is located at the same position on chromosome IIb.
IIA ------------------------о------R----
IIB ------------------------о-------r----
Allele G is located on the long arm (q arm) of chromosome Ia, and allele g is located at the same position on chromosome Ib.
IA -------M---G-----о------P---
IB -------m----g-----о------p----
Allele N is located on the q arm of chromosome IIa and allele n is located at the same position of chromosome IIb.
IIA --------N--------------о------R----
IIB ---------n--------------о-------r----
A). Draw these chromosomes, identifying genes R, r, G, g, N, and n as they might appear in metaphase I of meiosis. Assume there is no crossing over.
IA ----------G-----о---------
IB -----------g-----о----------
IIA --------N--------------о------R----
IIB ---------n--------------о-------r----
During metaphase I, homologous pairs together migrate to the equatorial plane, where they randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating. Any chromosome of the homologous pair might face any of the poles and then migrate to it. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. This random order in the equatorial plane is what introduces variation into the gametes. It is almost impossible that two gametes resulting from meiosis will get the same genetic charge.
B). Taking independent assortment and the subsequent random separation of chromosomes in anaphase I, draw the chromosomes, with genes identified, present in all possible gametes that could result once this cell completes meiosis. As above, assume there is no crossing over. Explain in your own words what is meant by independent assortment.
Independent assortment occurs when the alleles of two or more different genes distribute in the gametes independently from each other. In other words, a gamete receives an allele from a gene that does not depend on nor influence the allele of another gene in the same gamete. This can only be applied to independent genes. An organism gets only one of the members of the chromatids pair of each parent.
During gamete formation in meiosis, the pairs of homologous chromosomes separate after crossing over, and then chromatids sisters also separate, resulting in the formation of four gametes. Each gamete has different information from the combination of homologous chromosomes belonging to the father and to the mother.
There are four possible combinations, considering that there is no crossing over.
Gamete 1: GNRGamete 2: GnrGamete 3: gNRGamete 4: gnr
What controls traits and inheritance?
gametes
nucleic acids
proteins
temperature
Answer:Your answer could be B. Nucleic Acids.
Explanation: Correct on Edge 2021
plzzzzzzz help my lil sister out she wont stop texting me while im working
Answer:
False
Explanation:
It will only be 78% in 2040
Answer:
False.
Explanation:
63% of our energy comes from fossil fuels.
What is the purpose of xylem?
Answer:
xylem, plant vascular tissue that conveys water and dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as treachery elements. The vascular system is comprised of two main types of tissue: the xylem and the phloem. The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves. The phloem carries food downward from the leaves to the roots.
Explanation:
Radiation is a measure of the average kinetic energy of the particles in an
object
True
False
Hiii!! I believe the answer is False. The temperature of an object is a measure of the average kinetic energy of the particles in an object. ((:
What is a tumor? *
a mass of cancer cells
O a defective p53 gene
An accumulation of cyclins
O the rapidly dividing cells found at the site of a wound
Answer:
i think it is.. a mass of cancer cells
Explanation:
A biologist grow a plant inside a sealed glass jar. The plant keeps growing for several days but then dies. At the start of the experiment, the jar had a mass of 3 kg. At the end of the experiment, it still had a mass of 3 kg. Which of the following explains why the mass was the same? * (1 Point)
•The plant created mass.
•The jar's temperature was the same as before.
•The jar was sealed and new mass could not enter.
•The plant did not grow enough to add mass to the jar.
Answer:
A planta não cresceu o suficiente para adicionar massa ao jarro
Refer to the Newsela article "The Relationship between Hunger and War."
Part A
What is the relationship between conflict and famine?
Famine and war are often interrelated.
Famines caused by drought outnumber those caused by warfare.
All historical famines were caused by warfare.
Around half of all famines are caused by armed conflict.
Question 2
Part B
Which evidence from the text best supports the answer in Part A?
"A 2018 U.N. report called the situation in Yemen "the worst human-made disaster in the modern history of the world."
“Many of the worst wars of our time are accompanied by mass starvation. In some cases, starvation is used as a weapon."
"Food insecurity occurs when there is a lack of food or it is too expensive."
“South Sudan was also the world's most dangerous nation for aid workers in 2017."
Answer: Ali said that he/she speaks turkish
Explanation: I dont know you're answer but i will do as much as possible
What is the net force? Is it at rest or is it in motion?
ON, and in motion
13N and in motion
0N and at rest
13N and at rest
Answer
0N and at rest :)
Explanation:
7N+6N=13N
10N+3N=13N
Which of these events can lead to an increase in the population size of mice?
a. Some mice emigrate (leave) in search of food
b. Cats, owls, and snakes are added
c. More mice are born than die
d. A large number of mice die because of a forest fire
e. Cheese shortage
This means the birth rate would exceed the death rate, to make a positive growth rate in the population. So overall, the population will go up if more mice are born compared to those that die off.
Choices A, B, D and E all describe factors that would either kill mice or push them out of the habitat. Either way, these answer choices would have a decrease in population rather than increase. So we can eliminate these answer choices.
_______is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Answer:
Atomic Number
Explanation:
I found this quizlet it might help for your other problems. It has the same questions and answers.
Here: https://quizlet.com/304016728/genera-bio-ch2-flash-cards/
the atomic number
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In grammatically correct sentences trace the path of the products of photosynthesis as they exit the leaf.
Answer:
The correct answer is -
O2 - through the stomata
Glucose - through the phloem in the veins
H2O- through stomata
Explanation:
In the process of photosynthesis, plants capture light energy to initiate a chemical reaction that uses CO2 and H2O as reactants and converted them into oxygen and sugar or glucose as products. Thus, oxygen and glucose are the products form in photosynthesis.
These products are carried through various paths to the new location to get utilized. Glucose is carried by the phloem in the veins out to the plant whereas oxygen and water diffuse into the environment through stomata.
As atmospheric CO2 increases, the amount of CO2 dissolved in seawater is expected to increase as well. This produces more carbonic acid, which then dissociates into hydrogen ions and something else.
Answer:
bicarbonate ions
Explanation: (HCO3-)
Eating food is an example of which type of energy?
a. Thermal energy
b. Mechanical Energy
c. Radiant Energy
d. Chemical Energy
Answer:
chemical energy
Explanation:
we get this from food which pur bodies use as fuels to do things like running,talking,etc
The neurotransmitter thought to be involved in learning and memory is
x acetylcholine.
norepinephrine.
glutamate.
glycine
GABA
Is the proton the outer or inner circle
Answer:
me desculpa mais e só o meu celular ou o seu também tá tudo em inglês ?
During what phase of meiosis does both nuclei dissolve, spindle forms?
Answer:
Prophase I
Events of Prophase I (save for synapsis and crossing over) are similar to those in Prophase of mitosis: chromatin condenses into chromosomes, the nucleolus dissolves, nuclear membrane is disassembled, and the spindle apparatus forms. Major events in Prophase I.