Answer:
one sperm fertilizes the egg cell, forming a diploid zygote
Explanation:
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In angiosperm double fertilization, one sperm nucleus fertilizes the egg to form the diploid zygote, and a second sperm nucleus fuses with the two nuclei in the central cell of the embryo sac.
The egg is the female gamete in an angiosperm. It is a haploid cell that contains one set of chromosomes. The zygote is the fertilized egg. It is a diploid cell that contains two sets of chromosomes. The zygote will eventually develop into an embryo. The central cell is a cell in the embryo sac that contains two haploid nuclei.
Double fertilization is a unique feature of angiosperms. It is a type of fertilization in which two sperm nuclei fertilize two different cells in the embryo sac. The first sperm nucleus fertilizes the egg to form the zygote. The second sperm nucleus fuses with the two nuclei in the central cell to form a triploid cell. This triploid cell will eventually develop into the endosperm, which is a food reserve for the developing embryo.
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which molecule is needed for photosynthesis to occur?
Answer:
Carbon dioxide and water
Explanation:
plants prepare their food in presence of these molecules to produce sugar and oxygen which we required for survive
Within the cell, vacuoles can be thought
of as which of the following?
Answer:
B. warehouses
Explanation:
i just paid attention in class. Is that a good enough explanation?
Enzymes transferring electrons at the start of the ETS are referred to as ________, whereas enzymes transferring electrons to the terminal electron acceptor are designated as ________.Question 40 options:a) sulfatases; nitrogenasesb) lyases; hydrolasesc) permeases; proton pumpsd) dehydrogenases; oxidasese) oxidases; dehydrogenases
Answer:
dehydrogenases; oxidases
Explanation:
why is cell division important for unicellular and multicellular organisms
Multicellular organisms need cell division to grow and to replace dead or damaged cells and unicellular cell division is the only way single-celled organisms can reproduce. It means the same as cells died.
What are the two principle forms of ossification that occur in the development of the skeletal system
Ossification is a process in which the mesenchymal cells and cartilages convert to bone during development. it is has two types: Membranous and endochondral ossifications. It occurs in mesenchyme which has formed a membranous sheath (figure 4) .
Research endangered marine mammals of ocean and polar ecosystem. Write a 100or more words on the factors that have caused this mammals to become endangered.
Answer: hunting and capture by humans
Explanation: Principal anthropogenic threats to the survival of marine species include fisheries interactions (entanglement in nets and lines), hunting and capture by humans, ship strikes, pollution and habitat degradation, and climate change.
Define terrestrial animal.write any five characteristics of terrestrial animal
Answer:
- living on land or on the ground.
-rather than in water and trees or in the air
-a terrestrial life
-a terrestrial habitat
- and a terrestrial species
Factors
Increase or Decrease
in Carrying Capacity?
Answer:
Carrying capacity, or the greatest number of people that an environment can support over time without harming or degrading it, is controlled by a few basic factors: food supply, water availability, and space. Carrying capacity, or the greatest number of people that an environment can support over time without harming or degrading it, is controlled by a few basic factors: food supply, water availability, and space.
Explanation:
In sexual reproduction, will an offspring show a recessive trait if just one of its parents has recessive alleles for that trait? Explain your answer.
Answer:
No, they will not
Explanation:
In this question, we assume that the parents have genotypes of rr and RR (I use "r" out of convenience). If we cross both of these parents, it is impossible for any of the offspring to be rr like the one parent. They would all be heterozygous. If the other parent had a single recessive allele, then it would be possible.
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how does acyl coa get across the inner mitochondrial membrane?
Answer:
Explanation:
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When protons are actively transported across the cristae membrane in mitochondria to set up a proton gradient between the inter-membrane space and the mitochondrial matrix, this is referred to as___________________
Answer:
Explanation:
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A body was found at 12:22am on April 19. The temperature of the
body when found was 94 degrees. What was the approximate time of death?
(LO 1.6) Assume a person just drank a glucose solution and is sitting quietly.
Injecting insulin would cause compared to when there was no insulin
injected.
m
Answer:
more glucose to move into cells in muscles
Explanation:
The sympathetic nervous system's stimulation response is balanced by the parasympathetic nervous system's ________ response.
Answer: akinesia
Explanation:because it’s a nervous system
The sympathetic nervous system stimulation response is balanced by the parasympathetic REST and DIGEST response.
The autonomic nervous system (ANS) is divided into the parasympathetic nervous system and the sympathetic nervous system.The parasympathetic nervous system is responsible for normal body functioning and homeostasis, whereas the sympathetic nervous system deals with the fight, flight, or freeze responses.The parasympathetic system promotes rest-and-digest activities when the body is at rest.In conclusion, the sympathetic nervous system stimulation response is balanced by the parasympathetic REST and DIGEST response.
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most of the surface area of a plasma membrane consists of
Answer:
50% liquid and 50% protien by wieght
In an energy pyramid only about
of energy is transferred from one level to the next
get the most energy, while
consumers get
the least. This is because organisms use the energy during growth, metabolism, and cellular processes, much of the energy is lost in in the form of
Answer:
Heat
Explanation:
Energy that is not use in an ecosystem is eventually lost as heat. Energy and nutrient are passed around through the food chain, when one organism eat another organism any energy remaining in a dead organism is consumed by decomposes.
Water reacts with sodium metal to produce sodium hydroxide and hydrogen
gas, along with heat and light. What are the reactants in this chemical
reaction?
What is the name of the play that Hamlet presents to King Claudius?
Answer:
The Mousetrap
Explanation:
In act 3, scene 2 of William Shakespeare's Hamlet, Claudius asks Hamlet for the play's title, to which Hamlet replies, The Mousetrap. He says that the play presents the true story of a murder carried out in Vienna.
If two organisms of different species share more similar DNA sequences with each other than with other species, we can conclude that ________.
If two organisms of different species share more similar DNA sequences with each other than with other species, we can conclude that these two species are very closely related.
Anatomy and embryology, molecular biology, biogeography, and fossils all provide evidence for large-scale evolution (macroevolution).Different species with comparable architecture may be homologous (shared by ancestry) or analogous (shared due to similar selective pressures).The similarity of life's molecules is evidence that it shared an ancestor. The connections between different species can be discovered by comparing DNA sequences.Biogeography, the study of the geographical distribution of organisms, provides information on the origin and evolution of potential species.The presence of extinct species in the past and evidence of long-term evolutionary changes are both shown by fossils.Learn more about the Evidences of evolution with the help of the given link:
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2. What is a gene? ________________________________________________________
3. What is the difference between gametes and body cells? ____________________________________________________________________________
4. Each person’s DNA is unique except for who?________________________________________________________________________
5. How does each gene code for a protein?__________________________________________________________________________________________________________________________________________________
6. Look at the picture of the nucleus, chromosome, and gene and infer what the relationship is of the three things? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Answer:
2).a gene is a basic unit of heredity and a sequence of nucleotides in DNA that encodes the synthesis of a gene product, either RNA or protein
how many feet of intestines does the average person have
Insect are classified into how many main group ?
Answer: 3 Sub classes wingless insects known as apterygota and winged insects known as pterygota
Explanation:
how environmental factors can affect genetics
Answer:
Situational Genetics
Explanation:
The envirnment can control and manipulate species' genes through adaptation. An example of this is horse's teeth building resielnce to grind grass. In order to eat comfortably, horse prefer smushing their food. Over time, they have adapted to the environment by strengthening their teeth.
Which statement is true about water molecules?
a) The hydrogen atoms do not share electrons
b) Water molecules move randomly around each other
c) Water molecules cannot dissolve many substances
d) The oxygen atom has a negative charge
Answer:
B
Explanation:
i asked my Alexa... it was a good question
which of the following is not an example of symbiosis? A. red blood cells containing malaria B. vines using a tree for support C. nitrogen-fixing bacteria and roots of legumes D. pigs feeding at a trough
Answer:
A. red blood cells containing malaria
Explanation:
Also, just as a heads up. I saw the previous person posted a link. Remember not to click any links that lead to domains which are unknown to you. They could hold a virus.
Answer:
A
Explanation:
what is neuro immune dysfunction syndrome? can it be cured?
Answer:
it can be partially cured
Explanation:
its like cancer u can cure it to stop spreading kinda but you can still have a high high risk or getting it agaian and theres a process
is SARS a common virus?
Answer: SARS is not a common virus, it is a viral respiratory illness that was recognized as a global threat. it is spread through close contact. Although it is a very serious illness, it is rare to get. only eight persons were laboratory-confirmed as SARS cases.
Explanation:
fundamental similarity due to descent from a common ancestor is called
Answer:
fundamental similarity due to descent from a common ancestor is called homology.
What are MAD (mitotic arrest deficient) proteins and when are they important in the cell cycle?
Answer:
The mitotic arrest deficient protein MAD2B (MAD2L2) is a member of a MAD family of proteins and shows 48% similarity to MAD2 (MAD2L1) [1], [2]. Both MAD2 and MAD2B can bind to the anaphase promoting complex or cyclosome (APC/C), which is a downstream target of the mitotic spindle checkpoint.MAD (mitotic arrest deficient) are proteins related to spindle cell cycle checkpoint and it is important since they prevent the segregation of sister chromatids until all have bound to the spindle.
The cell cycle ensures the duplication of the genome and its distribution in daughter cells by passing through a coordinated and regulated sequence of events.
A series of checkpoints guarantee the orderly progression of the phases of cell division and the correct distribution of the duplicated genetic material in the daughter cells.
The checkpoints during mitosis are:
At the end of stage G1 and before S.Before anaphase in mitosis.DNA damage checkpoints in G1, S or G2.The checkpoint before anaphase in mitosis guarantees the separation of chromosomes, and operates by activating the Mad2 protein that prevents the degradation of segurin, until the conditions are appropriate.
That is, the Mad2 protein prevents the segregation of sister chromatids until they have all bound to the spindle.
Therefore, we can conclude that MAD (mitotic arrest deficient) are proteins related to spindle cell cycle checkpoint and it is important since they prevent the segregation of sister chromatids until all have bound to the spindle.
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Scientists have inserted a gene that codes for resistance to a biodegradable weed killer into a certain plant. Which of the following is the most likely benefit of the gene?
O The plant is more likely to survive when exposed to the weed killer
O The plant will be able to convert the weed killer into fertilizer.
O The plant will be able to produce chemicals to kill weeds around it.
O The plant is more likely to die when exposed to the weed killer.
QUICK PLEASE
Answer:
The plant is more likely to survive when exposed to the weed killer
Explanation:
since it has a gene that is resistant to the weed killer, it wont be affected by it.
resistant means it can defend itself from something