Answer:
Once the embryo sac has developed, pollination has occurred, and the pollen tube has grown into the ovary to make contact with the ovule, fertilization (fusion of egg and sperm) can occur.Typically, the pollen tube reaches the embryo sac via the micropyle (Greek, mikros + pyle = small opening), or opening, in the integuments of the ovule.. There, it discharges its sperm into the embry
Explanation:
The pollen tube enters into the ovule, through the micropyle. Inside the embryo sac, the tip of the pollen tube ruptures and the 2 male gametes are set free near the egg apparatus. Inside the embryo sac, one of the 2 male gametes fuses with the egg nucleus and forms a diploid zygote. This process is called syngamy or true fertilisation.
Answer:
In angiosperms, the pollen tube releases
its contents ( including sperm cells) in
to the embryo sac upon insertion into the
ovule, thus completing double
fertilization
How has the study of mitosis affected scientists’ knowledge of cancer? choose one
It led to a study of how to induce cancer cells to divide more rapidly.
It led to an understanding of how cancer cells divide so rapidly.
It led to the development of contact-inhibition regulators.
It led to the discovery of how to prevent cancer cells from dividing.
Explanation:
It led to the discovery of how to prevent cancer cells from dividing
What makes social animals unique?
Answer:
In these species, members of the group depend completely on one another. Different animals within the group have different jobs. Therefore, group members must work together for the good of all. Most species of ants and bees are highly social animals.
Explanation:
How is Wallace's view scientific
Platelets helps us in fighting against diseases. ______.
Answer:
True
Explanation:
THere are two types of platelets which are; lymphocytes and phagocytes
Lymphocytes swallow bacteria while phagocytes kill them
HELP ME MAKE THIS ESSAY BETTERStructure and Function of MicroscopesA microscope is a laboratory instrument used to examine objects that are too small to be seen by the naked eye. There are several types of microscopes but in this essay, we will be discussing the compound light microscope, the transmission electron microscope, and the scanning electron microscope. And we will be comparing its structure and function.From its name compound light microscope uses light as its radiation source with a wavelength that reaches from 400 to 700 nm though the Transmission electron microscope uses electrons as its radiation source, the scanning electron microscope uses electrons as well which wavelength reaches 0.005 nm.For the lens, the compound light microscope uses glass that is have its maximum resolution of 200 nm and can view colored images with an eyepiece powered 10x and 3 or 4 objective lenses that are power can be (4x, 10x, 40x) power. both transmission electron microscope and scanning electron microscope uses Electromagnetic as their lens although transmission electron microscope lens maximum resolution is 1 nm, and its maximum magnification power is 250 000x with a monogram view and scanning electron microscope lens maximum resolution is 10 nm and its maximum magnification power is 100 000x with a monogram view as well.For the specimen, the compound light microscope supports both living and non-living specimens. The transmission electron microscope and the scanning electron microscope both support only non-living specimens although the transmission electron microscope supports it on a small copper grid in a vacuum, and the scanning electron microscope supports it on in a metal disc in a vacuum.In the end, all microscopes are useful without microscopes no medicines would be found because scientists would not know how to treat the micro viruses and bacteria, and we could not explore and discover micro-organisms around us that we cannot see with our naked eye.
Answer:
After the period, make sure to add a capital letter. Also after the period, add a space. Other then that, it looks terrific! pretty impressed...
Explanation:
If fat is present a mixture of ethanol and water becomes
The active ingredient in which of the following drugs mimics a natural neurotransmitter?
Answer:
b. marijuana is correct
Explanation:
Which of the following is true about cells?
A. A cell’s components are all identical and perform the same function.
B. Cells have specialized components that all perform the same functions.
C. A cell has a single component that performs all of the cell’s different, specific functions.
D. Cells have specialized components that perform different, specific functions.
Answer:
D
Explanation:
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3.Which statement describes the major role of lipids within a cell?
Answer:
Lipids perform three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. The three main types of lipids are triacylglycerols (also called triglycerides), phospholipids, and sterols.
Explanation:
The statement that describes the major role of lipids within a cell is they are the main structural components of membranes. The correct option is D.
What are lipids?Lipids have three main biological activities in the body: they are essential signaling molecules, structural elements of cell membranes, and energy storage facilities.
Triacylglycerols (commonly known as triglycerides), phospholipids, and sterols are the three primary categories of lipids. Fats are subtypes of lipids that are typically composed of glycerol and fatty acid chains.
One sort of lipid, which includes fats, is a group of molecules that don't mix well with water. Hydrophobic, nonpolar, and primarily composed of hydrocarbon chains, lipids have a tendency to be.
Therefore, the correct option is D. They are the main structural components of membranes.
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The question is incomplete. Your most probably complete question is given below:
A. They cause DNA to replicate
B. They move RNA in the cytoplasm.
C. They catalyze chemical reactions in the cell cytoplasm.
D. They are the main structural components of membranes.
One of the following statements is correct about glycolysis:
A.Net gain of only 2 ATP.
B.Glycolysis in fermentation reaction requires more oxygen than glycolysis in aerobic respiration
C.Carbon dioxide is used during glycolysis to form ATP.
D.Only animals can carry on glycolysis.
Answer:
A.
Explanation:
Glycolysis produces 4 ATP molecules in total, however 2 ATP molecules are used to convert a glucose molecule into a new 6 carbon compound with 2 phosphates attached to it. So, the net yield of ATP is 2 molecules.
Answer:
A net gain of only 2 ATP
Explanation:
DID ANYONE HEAR ABOUT THE NEW PLANET IN THE SOLAR SYSTEM!!!!!!!!!!
ITS CALLED PLANET X or the 9TH PLANET!!! GO CHECK IT OUT!!!!!!!!!
Answer:
No way! planet 9 finnaly found!
Explanation:
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Following the fusion of an egg cell and sperm cell, the resulting diploid cell divides by mitosis to create two new daughter cells. Each daughter cell contains pairs of chromosomes, with one set inherited from each parent.
Which of the following best describes the pairs of chromosomes that are present in each newly formed daughter cell?
Choose 1 answer:
A) The pairs are homologous chromosomes that have the same set of genes, but likely different variations of those genes.
B) The pairs are non-homologous chromosomes that contain different sets of genes.
C) The pairs are homologous chromosomes that have identical copies of every gene.
Answer: A
i have no idea why
The pairs are homologous chromosomes that have the same set of genes, but likely different variations of those genes. The correct option is A.
What are homologous chromosomes?Among a pair of chromosomes with the very same gene sequence, loci, chromosomal size, and centromere location is referred to as a homologous chromosome.
One paternal and one maternal chromosome make up a homologous pair. In humans, the nucleus of a somatic cell contains 46 chromosomes.
Homologous chromosomes differ from sister chromatids because they are not identical and do not emanates from the same organism.
Sister chromatids are identical, side-by-side duplicates of each other that form as a result of DNA replication.
Homologous chromosomes do not pair together during mitosis. Homologous chromosomes line up end-to-end in mitosis so that when the cells divide, each daughter cell receives a sister chromatid from both members of the homologous pair.
Thus, the correct option is A.
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you bite into a fruit. it tastes bitter. it could be poisonous. you spit it out. what has happened in your nervous system to make you do this.?
Explanation:
The three nerves associated with taste are the facial nerve (cranial nerve VII), which provides fibers to the anterior two-thirds of the tongue; the glossopharyngeal nerve (cranial nerve IX), which provides fibers to the posterior third of the tongue; and the vagus nerve (cranial nerve X),
Inhibiting the enzyme acetylcholinesterase can lead to which of the following?
Answer:
all of the above is correct
Explanation:
chromosomes are duplicated during what portion of the cell cycle?
Answer:
S phase
Explanation:
during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division.
Human cells have _____ sets of DNA in each cell.
A) 2
B) 4
C) 1
D) 8
Answer:
See answer below.
Answer is verified.
Explanation:
Human cells have two sets of DNA in each cell.
And a total of 46 chromosomes in each cell.
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Human cells have two sets of DNA in each cell. Thus, the correct option is A.
What is DNA?DNA stands for Deoxyribonucleic acid. It is considered the genetic material of most organisms. It consists of base pairs like adenine, thymine, guanine, and cytosine.
Human cells have two sets of DNA in each cell, one came from the paternal side while the other came from the maternal side.
Therefore, it is well described above.
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In wolves, gray coat color (G) is dominant to black (g) and brown eyes (B) are dominant to blue (b). The genes that control these traits are located on different chromosomes. The alpha male of the pack has the dominant phenotype for both traits and is heterozygous for both traits. The alpha female has brown eyes and a black coat; she is heterozygous for eye color. Which option represents gametes that would be made by the alpha female
The combination of gametes that will be produced by the Alpha female is Bg, Bg, bg and bg.
According to this question, two genes coding for eye color and coat color in wolves are involved. Gray coat color (G) is dominant to black coat color (g) while brown eyes (B) are dominant to blue eyes (b). The alpha female of the pack is said to have a brown eyes and a black coat (gg) but she is heterozygous for eye color (Bb). This means that she posseses the following genotype: Bbgg. According to Mendel in his law of independent assortment, alleles of a gene will segregate into gametes independently of one another. This means that the alpha female with genotype (Bbgg) will segregate into the following combinations of gametes: Bg, Bg, bg and bg.Learn more about gamete formation at: https://brainly.com/question/11523490?referrer=searchResults
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How can using a dam as a source of freshwater also harm wildlife?
A. Dams help control floodwaters.
B. Dams provide drinking water.
C. Dams displace existing habitats.
Ο Ο
D. Dams provide water recreation.
Answer:
c
Explanation:
because its the only one that would be hurting wild life.
Using a dam as a source of freshwater can harm wildlife by displacing existing habitats. Therefore, option (C) is correct.
What are the negative impacts of dams?Dams often require the creation of reservoirs, which can submerge large areas of land and alter the natural flow of rivers and streams. This can lead to the loss of important habitats for fish, mammals, and other wildlife that rely on rivers and streams for food, shelter, and reproduction.
In addition, changes in water temperature, dissolved oxygen levels, and water flow can negatively impact aquatic ecosystems downstream from the dam.
These impacts can be mitigated through careful planning and management, such as the creation of fish ladders and other structures to help fish navigate past the dam, and the release of water at appropriate times to mimic natural flow patterns.
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the process by which dna makes a copy of itself is called
Replication
.......................
Fungi have chlorophyll.
True
False
False- unlike plants fungi to not have chlorophyl.
Why- Fungi do not need the sun to make food instead they break down their own food.
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Compare and contrast natural selection and artificial selection. PLEASEEE THANKYOU!!!
Answer:
the favorable traits to be passed on to the next generation are chosen by the breeder.
Explanation:
i had this question before
What of the following best explains the pace and timing of evolutionary change?
A: Evolutionary change quickly and constantly occurs throughout time.
B: The pace of evolutionary change has slowed down over time, and it only rarely occurs now.
C: Periods during which evolution occurred were always preceded by a catastrophe.
D: Long periods of stability were punctuated with periods of evolutionary change.
Answer:
B: The pace of evolutionary change has slowed down over time, and it only rarely occurs now.
Explanation:
What of the following best explains the pace and timing of evolutionary change The pace of evolutionary change has slowed down over time, and it only rarely occurs now.
Answer:
D: Long periods of stability were punctuated with periods of evolutionary change.
Explanation:
The plant roots containing nitrogen fixing bacteria are: *
(a) Maize
(b) Cotton
(c) Pea
(d) Wheat
The plant roots containing nitrogen fixing bacteria are
C. PEAPlants of the Pea Family known as legumes, are some of the most important hosts for nitrogen-fixing bacteria, but a number of other plants can also harbour these helpful bacteria.
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What is the role of knowing the Earth's history to mankind?
Answer:
Earth history enables us to understand those changes which no human being has ever seen (or if they have, they didn't record it) and to relate them to modern changes. Such events include: The rise and extinction of the dinosaurs. The formation of the Grand Canyon.
Explanation:
Answer:
Earth history enables us to understand those changes which no human being has ever seen (or if they have, they didn't record it) and to relate them to modern changes. Such events include: The rise and extinction of the dinosaurs. The formation of the Grand Canyon.
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Articulations are classified by their function or structure. Which of the following is an example of functional classification?
Answer:
d. Synarthrotic joints
Explanation: is correct for the choices offered.
2. Blood cells are produced by marrow from the system
Answer:
Circulatory system
Explanation:
Name 4 examples of carbohydrates.
Answer:
Bread, beans, milk, popcorn, potatoes, cookies, spaghetti etc.
Explanation:
HELP ME PLEASE I WILL GIVE BRAINLIEST
Answer:
The answer is C, from hydrosphere to atmosphere
Answer:
C
Explanation:
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the muscle cell’s contracting unit is known as the
Answer: The sarcomere is the functional unit of the muscle fiber. The sarcomere itself is bundled within the myofibril that runs the entire length of the muscle fiber and attaches to the sarcolemma at its end. As myofibrils contract, the entire muscle cell contracts.
Explanation:
Which layer in the blood vessel is composed of smooth muscle, allowing it to dilate or constrict?
Tunica intima
*Tunica media
Tunica externa
Endothelium
Answer:
b. Tunica media
Explanation:is correct
Answer:
B. Tunica media
Explanation:
