The statement embryonic stage is the first phase of the prenatal stage, lasting only two weeks after conception is false.
What do you mean by Embryonic stage?An embryonic stage may be defined as the period after implantation, during which all of the major organs and structures within the growing mammal are formed.
The first two weeks after conception are known as the germinal stage, not the embryonic stage. The third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Therefore, the statement embryonic stage is the first phase of the prenatal stage, lasting only two weeks after conception is false.
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Answer:
False
Explanation:
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To date, most of our natural antibiotics have been found to be produced by members of what genus?.
Answer:
streptomyces
Explanation:
Answer:
yes it's natural
Explanation:
100% natural to the century we are now so yeah
When does a zygote become an embryo?
once the embryo forms a heart, lungs, and brain
a few minutes after the male and female gamete fuse
once the zygote enters a safe environment either inside or outside of their mother
once the zygote starts dividing by mitosis and cell differentiation occurs
Answer:
Explanation:
The transformation of a zygote into an embryo adheres both to nature and to nurture: not only genetics but also environment determines the outcome. This idea has assumed many forms. A territory in the early sea urchin blastula contains clones of founder cells, and each clone contributes exclusively to one territory (Cameron & Davidson, 1991). Both the lineage of a founder cell, i.e. its nature, and the position of a founder cell, which determines how it is nurtured, contribute to its fate. Fertilisation, the topic of the first Forum, fixes the genes; interblastomere communication, the topic here, regulates gene expression. Blastomeres communicate like any other cell – via ligand-receptor interactions and through gap junctions. Saxe and DeHaan review these mechanisms. The definition of ligands and receptors becomes broadened in this context, and cell adhesions as well as gap junctions enter into the story. In spite of these entanglements, it appears that nature uses the same sorts of mechanisms to get cells to specialise that she uses to keep them talking. Thus, neurons and glial cells signal to one another via glutamate receptors and gap junctions (Nedergaard, 1994). Likewise, we expect neurotransmitters (and neurotransmitter transporters) to help signal differentiation. The biophysicist may ask whether electrical properties also play a role, but that we reserve for another Forum. If gap junctions figure in development as fusion pores that pass small molecules and electrical signals between blastomeres, another parallel suggests itself. Brian Dale asked in the first Forum: How does a spermatozoon activate an oocyte? This question, which concerns gamete communication, has produced two schools of thought and remains controversial (Shilling et al., 1994). Do sperm activate oocytes via contact-mediated mechanisms or through fusionmediated mechanisms? Or do both mechanisms occur, as they appear to in development?
Oxytocin secretion and milk release from the mammary glands of lactating female mammals are initiated by _____.
Answer:
oxytocin - Billie
Explanation:
Help me with this bs packet thing
questions in the attached img. someone help me pls
Answer:
A. Medicine — Plasmids are used as an anti-stress medicine to cope with stress-related conditions. It is also used replicate proteins. It is also used in gene therapy.
B. Agriculture — It is used for metal resistances. It is also used for antibiotic resistances. It provide bacteria with genetic advantages.
In the peripheral nervous system, schwann cells participate in the repair of damaged nerves by:.
Schwann cells participate in the repair of damaged nerves by forming a cellular tube that can direct the growth of new axons.
What is Schwann cell?They are referred to as the myelinating cell of the peripheral nervous system and support cells of peripheral neurons.
They participate in nerve cell repair by the formation of a tube that can direct the growth of new axons.
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Often, ____________ or basidiomycetes are the fungi involved, and they form several layers of hyphae, one of which envelops the photosynthetic ____________ .
Most of the time in lichen, ascomycetes or basidiomycetes form the fungal part with several hyphae layers enveloping the photosynthetic algal part.
LichensLichens are composite organisms. They are formed from a symbiotic relationship between fungi and algae. The fungi provide shelter and some vital minerals for the algae while the algae provide food via photosynthesis.
Oftentimes, the fungi components are usually ascomycetes or basidiomycetes. They form a network of hyphae around the photosynthetic algae as a form of protection.
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What are some structural similarities between the bird wing and frog arm? (Struggling with an assignment haha)
Answer:
The wing of a bird and the arm of a human are examples of c. homologous structures. This is because they are structures which have a similar
Assess It!
A disease has spread
amongst lily pads in a
pond ecosystem.
Which is true about the
impact of this disease?
A Small fish that rely on lily pads for
protection will decrease in population
The large fish population will increase
C. The water temperature will decrease
D. The frog population will increase
Answer:
The small fish populus will decrease because they need the lilypads to hid them from the big fish.
Explanation:
Due to the high pressure of blood flowing through this vessel, aneurysms are commonly found in the ______.
Answer:
aorta
Explanation:
The aorta is the largest artery of the body and carries blood from the heart to the circulatory system
Which tissue protects the organs? A. Muscle b.connective. C.nerve. D.epithelia
Answer:
B. connective tissue
Explanation:
they act as a sorta framework for the organs, protecting them from moving around too much and also separates them from one another
Kalani is told that he is the father to both of Winnie's sons, Marcus and Kevin. Marcus has type A blood and Kevin has type O blood. Winnie has type B blood. Kalani takes a blood test and finds out that he has type AB blood. Is it possible that Kalani is the father of both Marcus and Kevin? Explain your answer.
.It is possible that Kalani is the father of Marcus but he can not be the father of Kevin.
What is genotype?Genotype has to do with the total number of genes that an offspring recieves from its parents. We are told that the parents here are Kalani (blood type AB) and Winnie (blood type B).
If this is the case, it is impossible to explain the fact that Kevin has blood group O.It is possible that Kalani is the father of Marcus but he can not be the father of Kevin.
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What is one part of the DNA molecule that changes?
Hemophilia is an X-linked recessive genetic disorder. A baby girl is found to have inherited the trait from her parents. What are the phenotypes of the parents?
X-linked genes are inherited. The affected girl's father is hemophilic (X-Y), and the mother might be either hemophilic (X-X-) or carrier normal (X+X-).
What are the X-linked genes?
These are the genes located in the X séx chromosome and not in the somatic ones.
Traits coded by these genes are inherited. This is, X-linked genes are transmitted from parents to children through generations.
According to this, X-linked genetic disorder will be inherited as well.
Men have a high probability of being affected since they only have one copy of the X chromosome. In women, the effect of the mutation might be musk in heter0zyg0us state.Hemophilia is a X-linked recessive genetic disorder.
Let us represent the recessive allele with the symbol -, and the dominant allele with the symbol +.
X- is the chromosome carrying the recessive allele X+ is the chromosome carrying the dominant alleleFor the affection to be expressed, the person must be either,
X-X- ⇒ woman/girlX-Y ⇒ man/boyIf the baby girl is found to have inherited the trait from her parents, then her genotype is X-X-. She must have received one X- chromosomes from each parent.
Her father provided the X chromosome, so he must be hemophilic (X-Y)Her mother provided the other X chromosome, but she can be either a carrier (heter0zyg0us, X+X-) or hemophilic (h0m0zyg0us recessive, X-X-).Options,
Cross 1) affected father x carrier mother
Parentals) X-Y x X+X-
Gametes) X- Y X+ X-
Punnett square) X- Y
X+ X+X- X+Y
X- X-X- X-Y
F1) 1/2 = 50% of the progeny is expected to be healthy (25% X+X- girls + 25% X+Y boys)
1/2 = 50% of the progeny is expected to be hemophilic (25% X-X- girls + 25% X-Y boys)
Cross 2) affected father x affected mother
Parentals) X-Y x X-X-
Gametes) X- Y X- X-
Punnett square) X- Y
X- X-X- X-Y
X- X-X- X-Y
F1) 100% of the progeny is expected to be hemophilic (50% X-X- girls + 50% X-Y boys)
the phenotype of the father ⇒ hemophilic (X-Y)the phenotype of the mother ⇒ normal carrier (X+X-) or hemophilic (X-X-)You can learn more about séx-linked genes at
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Organism that can be found in your locality
Answer:
earthworm
Explanation:
Simply earthworm are found in under the grass
earthworm helps in making soil fertilize
If there is no fertilization, degeneration of the corpus luteum results in a drop in _____, which results in the sloughing off of the uterus's endometrium.
Degeneration of the corpus luteum results in a drop in progesterone production.
What is progesterone?Progesterone is a hormone produced by the corpus luteum that allows the uterus to prepare for fertilization. The halt in production of this hormone then causes the sloughing of the uterus's endometrium, which results in the individual undergoing the process of menstruation.
Therefore, we can confirm that the degeneration of the corpus luteum results in a drop in progesterone production.
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write two effect of Climate Change and write to one way to conserve environment?
1. Hotter temperatures, causing fires and making it harder to grow crops.
2. Air pollution causes lower air qualities, and makes earth hotter
One way : Carpool
I need help with this
C: The organelles are enclosed in membranes
Take your pulse for one minute and record it. Then dim the lights, shut off any music, close the door, and close your eyes. Breathe slowly and deeply for five minutes. Concentrate on taking slow, even breaths. After five minutes, take your pulse for one minute and record it. Was there a noticeable decrease in your pulse? If so, what do you think caused the drop?
Without heat from the Sun, the water cycle would
A)reverse.
B)not work.
C)slow down
.D)not be affected.
Answer:
not work
Explanation:
Some things in the water cycle relie on the sun to produce things like flowers and the water can't do some stuff all on its own, just like some animal relie on the sun.
Hope this helps you friend :)
ehh I hope -_-
In the dna isolation process, detergent was used to:.
In the DNA isolation process, detergent was used to:
--> facilitates homogenization. it allows the precipitate to form and stabilizes the DNA and it binds the negative ends of DNA.
Hope that helps!
1 it is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
A. Reverse fault
B. Normal fault
C. fault
D. Earthquake
it is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
The correct answer is letter D. Earthquake.
Earthquakes can be caused by movement of plate tectonics, eruption of volcanoes, and also man-made like huge explosions cause by explosive devices.
PLEASE HELP!
Why is nuclear fusion currently not feasible as a source of electrical energy?
Answer:
Fusion is generally impossible because the strongly repellent electrostatic forces between the positively charged nuclei prevent them from colliding and fusing. One of the key reasons we haven't been able to realize the promise of fusion is because its energy requirements are outrageously large. High-energy neutrons are produced during fusion reactions, although they are not radioactive in and of themselves. They do, however, have such a strong influence on the reactor's walls.
Once the dna at the replication fork is unwound by helicases, what prevents the two strands from coming back together to re-form a double helix?.
In what areas of the world is biodiversity the lowest?
tropical regions
polar regions
temperate regions
ocean regions
Answer:
Polar regions
Explanation:
Because plants don't survive in the extreme cold and ice that cover these regions year-round.
Due to their intense and harsh environmental circumstances, polar regions like the Arctic and Antarctica often have the lowest levels of biodiversity. So, the correct option is B.
What is Biodiversity?The term "biodiversity", which is short for "biological diversity", describes the range of living things and ecosystems that exist on Earth. It includes a wide range of species, genetic diversity within those species, a wide range of environments, and a range of ecological processes. Humans benefit greatly from biodiversity as it provides them with food, medicine and ecological services such as pollination and water and air purification.
Because of their intense and harsh environmental conditions, polar regions such as the Arctic and Antarctica often have the lowest levels of biodiversity. These regions have a relatively limited diversity of species because the cold and dry conditions make it difficult for many species to live. Furthermore, these areas often have low population density due to the severe environment and scarce resources.
So, the correct option is B.
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1. The process by which one type of bacteria is
changed into another type is called
a. transcription.
b. transformation.
c. duplication
d. replication.
Answer:
d
Explanation:
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4. scientists are studying photosynthesis in a forest ecosystem that has plants, animals, and decomposers (which consume dead things). which group or groups of organisms in the forest carry out photosynthesis?
Answer: Plants, animals, and decomposers (which consume dead things) are in a forest ecosystem. Scientists are studying photosynthesis in the forest. Which group or groups of organisms should they study? A jungle ecosystem has plants, animals, and decomposers (which consume dead things).
Explanation:
How does the haploid form of ulva switch to its diploid form?.
The haploid form of Ulva switches to the diploid form when gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote. Therefore, option D is correct.
What are gametophytes?The sexual stage in the alternation of plant generations and some algae is called a gametophyte. This stage results in gametes that go through generational alternation. It produces the zygote from which sporophytes develop and is a haploid phase.
The gametophyte stage of life is the predominant one in bryophytes. The male and female gametes are produced by the gametophyte's antheridia and archegonia, respectively. Gametangia are all of these structures put together.
Thus, the haploid form of Ulva switches to the diploid form when gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote. Therefore, option D is correct.
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Your question is incomplete, most probably the full question is this:
How does the haploid form of Ulva "switch" to its diploid form?
A. Sporophytes undergo meiosis to produce spores that germinate into diploid adults.
B. Gametophytes produce cells that undergo meiosis and produce spores that germinate into diploid adults.
C. Sporophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote.
D. Gametophytes produce cells that undergo mitosis to produce gametes that fuse to form a zygote.
Of the following, the most impactful action you can take to reduce your
carbon footprint is:
Answer: C. Eat a plant-based diet
Explanation: Of the following, the most impactful action you can take to reduce your
carbon footprint is: Eat a plant-based diet
Carbon footprint is the emission of the greenhouse gases like carbon. Lights should be turned off whenever not in use can help in reducing the carbon footprint. Thus, option A is correct.
What is a carbon footprint?
The carbon footprint is the amount of carbon, methane, and other greenhouse gases emitted due to natural or man-made activities. It is expressed in the terms of carbon dioxide released into the atmosphere.
The lights should be turned off whenever not in use to reduce the emission of the gases that harms the ozone and environment as the light energy release many greenhouse gases.
Therefore, the lights should be turned off whenever not in use to reduce the carbon footprint.
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