Answer:
The reduction of chromosomes in the gametes is necessary to make sexual reproduction possible, in which each parent contributes half of their chromosomes and in fertilization a cell with the complete amount of chromosomes is produced, the zygote.
Explanation:
The reduction of chromosomes to form gametes is done by meiosis, a reductive cell division. Sex cells or gametes are haploid cells, i.e. with half the chromosome charge, as each parent must contribute a gamete in the reproductive process.
The union of the parents' gametes is called fertilization and its product is the zygote, whose chromosome charge is complete or diploid.
For a diploid zygote to be formed, it is necessary for the sex cells or gametes to be haploid, or with half of the chromosomes of the species..
The genetic content built of proteins and nucleic acid found in the nucleus of cells are called chromosomes.
The reduction of the chromosome is essential for sexual reproduction.
In this sort of reproduction gametes from each parent fuse to form offspring.Each parent provides half the number of chromosomes (n) to form a complete offspring with the total set of chromosomes (2n).In the process of gamete formation chromosomes, get halved due to meiosis.The reproductive gametes from both the parent combine via fertilization and form the diploid offspring.Therefore for a diploid offspring to be formed the gametes need to be haploid.
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The plasma membrane is selectively permeable. It allows some substances to enter and leave the cell unrestricted while others are restricted. Some toxins produced by certain bacteria cross the plasma membrane, interfering with normal chemical reactions, and ultimately killing the affected cell. Why are cells unable to stop the flood of these harmful substances into the cell
Answer:
There are specific receptors present on the surface of the normal cell membrane to recognize the molecules to allow them to pass or not. Most of the bacterial toxin are water-soluble molecules, and bound to the cell surface and interact with them as some time antibody-antigen interaction or cell recognition does not occur that form a pore in the cell membrane and toxins move into the cell.
Once toxins enter the cell they attack intracellular targets through endocytic vesicles. Ultimately these ends in cell death.
The cells are not able to stop the flow of the mentioned harmful substances into the cell as they fail to recognize them as foreign entities. These foreign toxins have intracellular targets with which they bind and lead to death of the cell.
Cell death due to foreign toxins:The plasma membrane is formed of lipids. The toxins produced by the bacterial cells are water soluble. Therefore, they identify particular receptors on the membrane and associate with them. Thus, cell at certain occasions fail to identify them as foreign entities.
They combine with the plasma membrane of the cell and induce pore formation, however, there are many toxins that invade the cell and possess intracellular targets via endocytic vesicles. With the help of these vesicles, they deliver their enzymatic domain into the cytosol and results in the death of the cell by obstructing the metabolism of the cell.
Thus, cells fail to identify the bacterial toxins as foreign entities and they invade the cell and results in cell death.
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PLEASE HELP!!!! DUE AT MIDNIGHT
Drag the tiles to the boxes to form the correct pairs.
Match the parts of fruits.
Answer:
Exocarp is the outer layer
Endocarp surrounds the seed so I suppose the papery part
Mesocarp I think is the fleshy stuff.
Hope it helps!
Explanation:
PLEASE HELP ME WITH THIS AND HURRY WILL MARK AS BRANLIEST!!!!!! Why do leaves change color in the fall? Research this phenomenon and write a two-page report describing what happens. Be sure to include an introduction and a conclusion to your report. Use the information you have learned in this lesson about chlorophyll, the green plant pigment, and its role in photosynthesis to help you explain what happens in the fall.
Answer:
Leaves are always the color they turn in the fall
Explanation:
The chlorophyll created when the leaves use sunlight to create energy for the tree has a green pigment that covers the leaves actual colors. As the leaves separate from the trees they stop making chlorophyll, thus allowing the leaves true colors to return.
I hope this helps and good luck on that two-pager!
Answer:
During the fall the day gets shorter hence less sunlight this results to leaves stopping their food making process. The chlorophyll breaks down, the green color disappears and the yellow to orange color becomes visible
Explanation:
Predict the effects of injuries to the following structures: Cerebellum, Pons, Thalamus
Answer:
Explanation:
if cerebellum become injured then problems occur in those activities of the body which are controlled by cerebellum like speeching,thinking,learning and sensation of sound and light.
if pons become injured then problems occur in those activities of the body which are controlled by pons like inspiration expiration biological and rhythm.
thalamus control pleasure and fear feelings so if thalamus become injured then problems occur in pleasure and fear feelings
On a very cold morning, Boojho and Paheli were talking with each other as they walked down to their school. They observed that the air comming out of their mouth looked loke smoke. They were amused and wondered how it happened. Help them find the answer
Answer:
condensation
Explanation:
2. Which 2 organelles are found in BOTH plants and animals? *
Answer:
Structurally, plant and animal cells are very similar because they are both eukaryotic cells. They both contain membrane-bound organelles such as the nucleus, mitochondria, endoplasmic reticulum, golgi apparatus, lysosomes, and peroxisomes. Both also contain similar membranes, cytosol, and cytoskeletal elements.
Explanation:
if tanA= x/y find the value of xsinA+ycisB
Answer:
If tan A = 3 / 5, then sin A = 3√34 / 34 and cos A = 5√34 / 34 .
Assuming x = 5 and y = 3 (The problem is deficient in this regard)
5(3√34 / 34) + 3(5√34 / 34)
30√34 / 34
15√34 / 17
Explanation:
I hope this helps!
Which is not a unique property of water
Answer:
A
Explanation:
All of the other options are specific to water, but quite a few liquids cool off a lot faster than water.
water cools very rapidly is not a unique property of water. Thus option A is correct.
what are the properties of water molecule ?It has no taste, odor, or transparency, where the nucleus of the oxygen atom attracts electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is more electro negative and electron-greedy than hydrogen, results in the development of a partial negative charge on the oxygen of the water and a partial positive charge on the hydrogen end.
Water shows strong cohesive property where the attraction of molecules for other molecules of the same kind is referred to as cohesion.
Surface tension is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
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Your question was incomplete, so the complete question is
Which is not a unique property of water
A) water cools very rapidly
B) frozen water floats on liquid water
C) water molecules stick to each other through hydrogen bonds
D) water covered most of the earths surface and retains a large amount of heat
I have a question regarding construction building code ? can you help?
ASAP!!!!!!!!!
How do plants help prevent erosion?
Plant leaves take in carbon dioxide during photosynthesis.
Plant roots absorb water from the ground.
Plant roots help to hold soil in place.
Plant leaves are used to create fabrics and other materials.
Answer:
plant roots hold soil in place
Explanation:
have a nice day
Answer:
plant roots hold soil in place
Explanation:
top person star whatever was right
What is the alien invasion in the Florida Everglades?
help me pls!!!! I have to get a good grade!!!
Someone pls helppp quick!!!!
Answer:
First one
Explanation:
A molecule of glucose has 10 fewer hydrogen atoms than a molecule of sucrose
Sucrose- H22
Glucose-H12 + 10 =22
Hope this is right!
Why do planets close to the sun have thin atmospheres and the planets far away from the sun have thick atmospheres. Use what you know about the nebular theory.
Answer:
There are two primary factors: size and distance from the Sun. Gravity helps planets and moons to hold on to their atmospheres, so small planets/moons such as Mars and the Moon have thin atmospheres. The reason why the outer planets are larger is probably down to two major factors. The first is simply the amount of material available which may be accreted to a planet. Clearly, the further away from the Sun, the longer the orbit (twice as far means an orbit twice the physical length).
Explanation:
Please help. This is due today :(
Label the following.. Word bank is below
HHRRTSEE rearrange this
Answer:
THRESHER
Explanation:
If a woman is heterozygous for widow's peak
(widow's peak is dominant over a smooth hairline) has children with a man with a smooth hairline, what
are the possible phenotypes of their children?
It is impossible to determine the possible phenotypes.
O All of their children will have a widow's peak.
O None of their children will have a widow's peak.
It is possible for their children to either have widow's peak or a smooth hairline.
Answer:
It is possible for their children to either have widow's peak or a smooth hairline.
Explanation:
Let's say that the widow's peak allele is W (dominant) and the smooth hairline is w (recessive).
A woman heterozygous for widow's peak is Ww. A man with a smooth hairline must have two copies of the smooth allele since it is a recessive trait, so he must be ww.
The cross is Ww x ww
W w
w Ww ww
w Ww ww
There is a 50% chance that the children will have the genotype Ww, and therefore have a widow's peak. There is a 50% chance the children will be ww, and will therefore have a smooth hairline.
So, It is possible for their children to either have widow's peak or a smooth hairline.
POSSIBLE POINTS
A part of the circulatory system allows the exchange of water, oxygen, nutrients, and waste between the blood and surrounding
tissues. Which part of the circulatory system is described. ?
Answer:
rough ER → ER-to-Golgi transport vesicles → Golgi cisternae → secretory or transport vesicles → cell surface (exocytosis)
Explanation:
In a direct variation, y=39 when x=3. Find the value of y when x=2.
1.) 58.5
2.) 26
3.) 02
4.) 3
I need some help on this worksheet ASAP please
Answer:
sorry I don't know the answers
A woman of childbearing years who is not pregnant has _______ absorption rate of calcium as compared to a woman who is pregnant
Answer:
The correct answer is - lower
Explanation:
Pregnant women require an increased amount of calcium as it can provide a sufficient amount of calcium for herself and her fetuses. During lactation, the calcium is reabsorbed very fast and rapidly that supplies the calcium for the milk. So, the normal women of childbearing age do not require the amount of calcium as pregnant women require.
Thus, there is a lower absorption rate of calcium as compared to a pregnant women
What type of hormone is testosterone?
a steroid hormone
a protein hormone
a neurotransmitter
DNA TO PROTEIN
How is DNA used to “make” Proteins?
OCA2 Gene:
ATA CTC TAC CTT GAG CCG
Answer:
The recombinant vesiculoviruses can also be inactivated for use as killed vaccines. ... 102000004163 DNA-directed RNA polymerases Human genes 0.000 claims ... Proteins 0.000 claims description 54; 101710002679 OCA2 Proteins 0.000 ... CCA TTC AAT ATA GGT CTT TAC AAG GGA ACG ATT GAG CTC ACA ATG ...
Explanation:
The virus thus constructed can be used as an immunization vaccine against measles ... 108090000626 DNA-directed RNA polymerases Proteins 0.000 claims ... Proteins 0.000 claims description 37; 102100016028 P protein Human genes ... Trp Trp 480 485 490 gct gag caa gat tct ccg ttc tgc ttc ctt gcg ttc tgc ttt gag tac 1539 ...
Which organelle aids in the maintenance of cell homeostasis by selectively regulating The passage of materials into and out of the cell?
A. Plasma membrane
B. Lysosome
C. Ribosome
D. Nuclear membrane
Answer: Plasma Membrane.
Explanation:
Plasma membrane controls what goes in and out of the cell and maintains a stable internal environment.
Lysosomes breaks down dead stuff and can program the cell death.
Ribosomes create proteins.
Which of the following biological processes releases oxygen into the atmosphere?
Answer:
photosynthesis
Explanation:
wcogo (gocow backwards)
water+carbon dioxide->glucose+oxygen
Planet X is a terrestrial planet in our solar system. It has 21% oxygen in its atmosphere. Humans can walk on this planet without the aid of a space suit. Based on the description, planet X is____ .
a.Earth
b.Mars.
c.Mercury
d.Venus
Answer: the answer is actually earth
Explanation: A
PLS HELP ILL MARK BRAINLIEST !!!!
Stating the consequences of drug use is a resistance strategy that can involve __________. A. explaining why the drug is harmful for you B. explaining possible negative side effects of the drug C. explaining how your life might negatively change if you began taking the drug D. all of the above Please select the best answer from the choices provided. A B C D Mark this and return
Answer:
D. all of the above
Explanation:
It is all of them. When we are explaining to someone the consequences of taking a certain drug we can start by explaining to them why the drug in question is harmful to them. Will it ruin their body, their health or others. The drug may have some negative effects that we also need to explain. Telling them how it will ruin their life or their family if they start to take the drug.
if a sample contains 20g of an isotope that has a half life of 1000 years how much will be left after 2000 years
After 2000 years, there will be 5g of the isotope remaining.
What is an isotope?If an isotope has a half-life of 1000 years, it means that after 1000 years, half of the original sample will have decayed. After another 1000 years (2000 years total), half of the remaining sample will have decayed, and so on.
To calculate how much of the sample will be left after 2000 years, we can use the following formula:
[tex]N = N_{0} * (1/2)^ (t/T)[/tex]
where:
N = the amount of the isotope remaining after time t
N0 = the initial amount of the isotope
t = the time that has elapsed
T = the half-life of the isotope
Plugging in the values from the problem, we get:
N = 20g * (1/2)^(2000/1000)
N = 20g * (1/2)^2
N = 20g * 1/4
N = 5g
Therefore, after 2000 years, there will be 5g of the isotope remaining.
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4. Earth's lower mantle lies belor what
Answer:
crust
Explanation:
Answer:
the crust
Explanation:
Earth's lower mantle lies just below the crust. In geology, a crust is the outermost layer of a planet. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks