Answer:
An embryo sac is said to form when the haploid megaspore nucleus divides. It possesses two haploid nuclei and six haploid cells which do not have cell walls.
Explanation:
Plants can reproduce both sexually and asexually. What are some examples of sexual reproduction in plants? Select ALL that apply. Responses
Sexual reproduction in plants involves the fusion of male and female gametes to produce offspring with genetic diversity.
Mechanisms that facilitate sexual reproduction in plants are examples:
1)Pollination and Fertilization: Many plants rely on pollinators, such as bees, butterflies, or birds, to transfer pollen from the male reproductive structures (anthers) to the female reproductive structures (stigma) of flowers.
This process enables the fusion of sperm cells within the pollen with egg cells in the ovules, leading to fertilization.
Examples include flowering plants like roses, sunflowers, and apple trees.
2)Seed Production: After fertilization, the ovule develops into a seed. Seeds contain an embryo, formed by the fertilized egg, enclosed within a protective seed coat.
The mature seeds can disperse and germinate to give rise to new plants.
Various plant groups, including angiosperms (flowering plants) and gymnosperms (conifers and cycads), reproduce sexually through seed production.
3)Alternation of Generations: In plants with a complex life cycle, such as ferns, mosses, and liverworts, sexual reproduction involves an alternation between two distinct generations: the gametophyte and the sporophyte.
The gametophyte generation produces gametes (sperm and eggs) through specialized structures, while the fusion of gametes gives rise to the sporophyte generation, which produces spores.
4)Self-fertilization: Some plants have the ability to self-fertilize, where the pollen from the anther of a flower is transferred to the stigma of the same flower or another flower on the same plant.
This allows for sexual reproduction without the need for external pollinators. Self-fertilization can be seen in plants like tomatoes, peas, and certain grass species.
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3. If muscle contraction were an athletic game, calcium would be the most valuable player. Describe,
using some depth, the roles calcium is serving both inside the muscle fiber and outside at the NMJ.
Answer:
Explanation:
At the NMJ, calcium is responsible for "unlocking" the ligand gated channels, allowing AcH to be released into the synaptic cleft. When AcH binds and the AP moves down the sarcolemma and into the t-tubule, calcium is then released from the sarcoplasmic reticulum into the sarcoplasm. It then binds to the calcium subunit of troponin, causing a confirmational change in tropomyosin, exposing the active sites on actin. This allows the myosin heads to bind, causing muscle contraction.
Study the image of a plate boundary. The Asthenosphere is being divided by the Lithosphere on the left of the diagram. Oceanic crust is above the Lithosphere and continues until it reaches the Continental crust on the right. The Lithosphere layer on the right is moving left toward the Lithosphere layer on the left that is moving right and down. Two volcanoes are above the area where the lithosphere layers meet. Which feature is forming? mountain rift valley earthquake island chain
Answer:
Sorry about the guy above me lolz, the answer is A :))
Explanation:
Have a great day !! muah
Answer:
It is island chain which on mine is D
Explanation:
A pesticide was applied to a population of roaches, and it was determined that the LD50 was
55mg/kg . If the average mass of a roach was 0.02kg, which of the following approaches will
determine the dose in
mg per roach?
Based on the information given, the correct option will be C. 55mg/1kg × 0.02kg.
From the complete information, it was stated that a pesticide was applied to a population of roaches, and it was determined that the LD50 was 55mg/kg.In a situation where the average mass of a roach was 0.02kg, the approach that will determine the dose in mg per roach will be 55mg/1kg × 0.02kg.
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hello people of brainly
Answer:
a scientist should observe the natural world without changing or destroying it
What is the name of the gland located above each kidney?
o thyroid gland
O
pancreas
pituitary gland
o adrenal gland
Answer:
It's the thyroid
Explanation:
I took the test
A red animal (AA dominant) mates with a yellow animal (aa recessive). What would be the genotype and phenotype of a heterozygous offspring? (Assuming
complete dominance)
a.phenotype (yellow): genotype Aa
b.phenotype (red); genotype AA
c.phenotype (yellow); genotype aa
d.phenotype (red): genotype Aa
Answer:
d.phenotype red: genotype Aa
Explanation:
a red animal that is a Donna Mae a would still have dominance over the yellow animal it recessive so if you put it in the chart form AA would be on top and the lowercase a a would be on the left side so it would be phenotype red genotype capital a lowercase a .
In codominance, the genotype of the cross will be Aa and the phenotype will be yellow. Therefore, option "A" is correct.
What is codominance?Codominance is a genetics-related term. The term means a type of inheritance, where two versions (alleles) of the same gene are expressed separately. This lead to the yield of different traits in the offspring. Examples are when in animals such as speckled chickens, having alleles for both types of feathers, black and white.
Roan cattle is also an example of co-dominance, which expresses alleles for both red hair and white hair. Codominance is also present in plants. Examples are rhododendrons which have a simultaneous expression of red and white genes for flower color display flowers with both red and white petals.
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Why can yeast be considered to be a parasite?
A. Yeasts are helpful towards other organisms.
B. Yeasts are considered to be a food source by some organisms.
C. Yeast can only move by being carried by another organism.
D. Yeasts can harm other organisms.
Answer:
B
Explanation:
What might happen to the Earth if human increase the amount of greenhouse gasses?
Explain your answer.''
Answer:
Global warming will occur
Explanation:
Greenhouse gases are special gaseous compounds that have this ability to trap HEAT due to their structural composition. They include; carbon dioxide (CO2), chlorofluorocarbons (CFC), methane (CH4) etc.
Anthropogenic activities such as burning of fossil fuels etc. release these gases into the atmosphere where they cause harm to the Earth. Greenhouse gases contribute immensely to the GLOBAL WARMING EFFECT, which is the increase in the temperature of the Earth surface. Therefore, if humans increase the amount of greenhouse gases in the atmosphere via their actions, there will be a GLOBAL WARMING occurrence.
The function of the liver in humans is to maintain the [glucose] circulating in the blood stream at reasonably constant levels. This is so organs like the brain that use primarily glucose as their carbon source to produce energy via ATP have a steady supply of glucose. It also ensures that the levels of glucose in the blood stream do not get too high. Using the plots from problem 6, discuss why it makes sense that glucokinase in liver would behave differently than the hexokinase in other cells.
Answer:
Due to difference in function.
Explanation:
Glucokinase in liver behave differently than the hexokinase in other cells because glucokinase performs different function in the body. Glucokinase is an enzyme that is responsible for sensing the glucose level in the blood and also plays a key role in the storing of glucose as glycogen while on the other hand, this storing ability is absent in hexokinase so that's why the glucokinase in liver behave differently than the hexokinase in other cells.
A gas has no definite:
a shape
b volume
c
weight
d both A and B
Answer:
a gas has no definite Shape and Volume
Explanation:
hope this helps! have an amazing day lovely!
1.
Which has the greatest impact on the temperature of the Earth's atmosphere?
chemical runoff
sulfur dioxide
carbon dioxide
Ozone
Please help! I am giving lots of points for this.
Answer: It is easier for birds and insects to pollinate
Explanation:
What process is occurring in this picture at B?
Answer:
Translation
Explanation:
Translation is the second process that occurs in protein synthesis. It is the process whereby mRNA template is used to synthesize an amino acid sequence, which eventually becomes a protein.
The process of translation occurs in the cytoplasm (specifically in the ribosome). As depicted in this image, the mRNA produced during transcription is transported out of the nucleus into the cytoplasm. A RNA molecule called tRNA reads the mRNA sequence (codon by codon) and carries corresponding amino acid into the growing amino acid sequence.
Hence, according to this question, the process occuring at B according to this image is TRANSLATION.
< 1 >
PLAY
STOR
of science to answer the
10
The students want to see how changes to the design of the marble track will
affect the energy of the marbles.
(a)
As you respond to Part A, Part B, and Part C, follow the directions below.
estigate how the potential
he marbles move through
e different materials the
• Address all the instructions in each prompt.
• Use evidence from the information provided and your own knowledge of
science to support your responses.
Part A
One student wants to increase the potential energy of the marble at the starting
position. Explain one way the students can adjust the track to increase the
marble's potential energy. In your explanation,
• describe the dimensions of any materials used to adjust the track and
• explain why the adjustment to the track would increase the marble's
potential energy
Answer:
ay ewan ko ba tanungin mo sa mama mo idiot
Does anyone know how to do Punnet squares?
Use the Punnet square to answer the question
1. Write the phenotypes of the three genotypes shown above.
TT _______
tt _______
YT _______
Answer:
homzygous homzygous heterozygous
Explanation:
The adenine of the start codon is located at the +1 position. Use the DNA Mutations Interactive to determine which statements describe missense mutations. a substitution of G to U at position +13 in the sense strand a transition at position +12 in the antisense strand a transversion of C in the sense strand of the histidine codon a G nucleotide is inserted after position +1 in the antisense strand a deletion of the A at position +7 in the antisense strand an insertion of A between positions +7 and +8 on the sense s
Answer:
A transition at position +12 in the antisense strand
A deletion of the A at position +7 in the antisense strand
Explanation:
Given that Adenine of the start codon is located at the +1 position, The correct statements that describe missense mutations are
A transition at position +12 in the antisense strandA deletion of the A at position +7 in the antisense strandAdenine is a purine nucleobase that is used in the formation of nucleic acids
Which of the following is NOT a function of a cell membrane?
a. the cell membrane protects the cell
b. the cell membrane helps molecules move into or out of the cell
c. the cell membrane assists in the synthesis of proteins
d. the cell membrane has identifying marker molecules on it
Answer:
A. the cell membrane protects the cell
Cnidaria have no brain, so they Cannot move .a O .Cannot chase their food.
b O Must be solitary
c O .Cannot swim d
O Cannot be predators
.e O :Insects that are primitive have a life cycle that differs from advanced insects in that The adults can only feed on solid food
.a O There is no pupal stage
.b O Its larvae feed on different foods from the adults
.c O They take much longer to become an adult
dO The adult cannot fly .
What is the first thing to do after putting a weighing boat on the balance?
Answer:
plz follow me
Explanation:
yeititosspoypg9tt88y9y
Usually the outermost planet of the solar system is Jupiter.
Please select the best answer from the choices provided
от
OF
Answer:
False
Explanation:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
(Pluto)
the outermost planet is technically neptune but some still consider pluto a planet. but jupiter is not the outermost planet.
PLZ HELP ASAP Maria pushes a ball, and the ball rolls across the table. She wants to make the ball roll faster. Maria needs to push the ball A. with more strength. B. on a different table. C. on the other side of the table. D. with less strength.
That’s the right answer for that question
Answer:
ok better learn from your mistakes
Explanation:
Different alleles produce different characteristics. True False
Answer:
Explanation:
Los alelos son formas alternas de un gen, que difieren en secuencia o función. Toda característica genéticamente determinada depende de la acción de cuando menos un par de genes homólogos, que se denominan alelos.
How many amino acid differences would you expect to find between the hemoglobin of a human and a wolf?
Answer:
600! IF THIS ISN'T IT IM SO SORRY
Explanation:
What do fossils provide evidence for?
A. the history of life in the geologic past
B. why species became extinct in the past
C. developmental patterns of living organisms
D. the genetic similarities between living and extinct organisms
Answer:
A
Explanation:
it provides insight to what animals existed in the past, ecosystems and adaptations of currently existing species
Greg performed an experiment in which he measured the reaction rate of two different enzymes at varying pH is his real belts appear in the table below
Answer:
B. Enzymes have particular pH's at which they function best
Explanation:
The table in this question describes the reaction rate of two enzymes (enzyme 1 and 2) measured in mmol/min. According to the question, Greg performed an experiment in which he measured the reaction rate of two different enzymes at varying pH.
At pH 7-9, the reaction rate of enzyme 1 was more than that of enzyme 2 while from pH 9.5-11, the reverse was the case. This portrays that the reactivity of an enzyme is in response to the pH they are placed in. In other words, different enzymes have particular pH's at which they function best.
What type of conservation will result in the greatest reduction in the burning of fossil fuels?
Answer:
Conservation of air.
Explanation:
Conservation of air will result due to greatest decrease in the burning of fossil fuels because fossil fuels greatly damage the air. The burning of fossil fuels produces carbondioxide gas in large amount that can be released in the atmosphere. This increase in carbondioxide gas in the air causes pollution that leads to global warming as well as health problems in humans. So we can conclude that decrease the use of fossil fuel leads to conservation of air.
What does inflammation lead to allow white blood cells to find the
infection and the release of cytokines?
What is the purpose of cellular respiration?
a
break down sugars to use their energy directly
b
capture energy from the sun and store it in sugars
c
break down sugars to create ATP
d
capture energy from the sun and store it in sugars