In angiosperm double fertilization, one sperm nucleus fertilizes the ______ to form the diploid ______, and a second sperm nucleus fuses with the two nuclei in the central cell of the embryo sac.
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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1.___-they speed up chemical reactions
2.___-they only catalyze specific reactions with specific substrates, like a lock and key.
3.___-slight changes in oH or temperature can cause then to stop working
Answer:
Catalyst
Enzymes
I don't know the other one, I'm sorry. Give the first two a try tho
What percentage of body weight must be lost due to dehydration before delirium, exhaustion, and collapse occur
Answer:
7-10 percent of body weight must be lost due to dehydration before delirium, exhaustion, and collapse occur.
Explanation:
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The input of sewage, fertilizer runoff, and animal waste can cause the formation of Choose one: A. an algal bloom. B. nutrient-poor soil C. fertile farmland. D. an artesian well.
Answer:
An algal bloom.
Explanation:
The input of sewage, fertilizer runoff, and animal waste can cause the formation of an algal bloom (abundances of cyanobacteria) because of the excess nutrients (nitrogen or phosphorus). If there are too much nutrients in the water (caused by the sewage, fertilizer runoff, and animal waste) it creates a perfect environment for excess growth, being an algal bloom. Algal blooms are toxic and are known to be harmful to the animals that rely on this source for their survival and humans as well.
What's the only kind of parrot that can't fly?
Mention some of plant organs
Answer:
Root,stem,Leaf and flower
Answer:
Plants are made up of organs, including roots, leaves, the stem and reproductive organs.
Each organ has its own functions.
Together, the organs of a plant allow it to carry out the seven processes of life.
Explanation:
what is the alternate name for 0 degrees latitude
Answer:
the Equator
The Equator is the line of 0 degrees latitude.
Explanation:
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Answer:
0 degrees latitude is known as the equator.
Explanation:
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what type of carbohydrate is created by photosynthesis?
Answer:
glucosePhotosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose.
Do all cells (brain cells, skin cells, liver cells, etc) express the genes or make the same proteins
Answer:
yes
Explanation:
have a good day or night
Which of the following is true about a sea star's DNA?
All of the cells of the sea star have different DNA that allows it to grow into a complex organism
As the sea star cells divide, the DNA changes to help create the sea star
All of the cells of the sea star have the same exact DNA
All types of sea animals have the same DNA, but the animals are different from each other because different parts of the DNA are expressed.
Answer:
The answer is: All of the cells of the sea star have the same exact DNA (I think)
Explanation:
the ventral rami of spinal nerves ________ form the major nerve plexuses.
Answer:
The blank is:
C1 through T1 and L1 through S4
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Asexual and sexual reproduction in animals is similar in that both
a. increase genetic variation in offspring.
b. produce offspring that have double the amount of genetic information of the parent(s).
c. rely on parental chromosomes to mix in new ways.
d. generate offspring that carry parental genes.
Answer:
d generate offspring that carry parental genes
What is fertilizer?
Outside matter added to the ground to help plants grow
Oxygen and water added to the ground
Inorganic matter
Nitrogen-fixing bacteria in the ground
Answer: 3
Explanation:
Nitrogen, the most abundant element in our atmosphere, is crucial to life. Nitrogen is found in soils and plants, in the water we drink, and in the air we breathe. It is also essential to life: a key building block of DNA, which determines our genetics, is essential to plant growth, and therefore necessary for the food we grow. But as with everything, balance is key: too little nitrogen and plants cannot thrive, leading to low crop yields; but too much nitrogen can be toxic to plants, and can also harm our environment. Plants that do not have enough nitrogen become yellowish and do not grow well and can have smaller flowers and fruits. Farmers can add nitrogen fertilizer to produce better crops, but too much can hurt plants and animals, and pollute our aquatic systems. Understanding the Nitrogen Cycle—how nitrogen moves from the atmosphere to earth, through soils and back to the atmosphere in an endless Cycle—can help us grow healthy crops and protect our environment.
Answer:
Nitrogen fixing bacteria in the ground
Explanation:
why is the digestive tract of the frog well vascularized
The digestive tract of the frog is well vascularized because it aids in the absorption of nutrients.
The digestive tract of a frog is a hollow long tube that extends from the mouth to the anus which helps in the ingestion and digestion of food.
The digestive tract of frog has the following characteristics:
alimentary canal of the frog is not long, that is, it is short. It has accessory organs of digestion such as liver, gall bladder and pancreas.All the digested food substances are absorbed at the small intestine due to the presence of microvilli.
This microvilli is made up of a central core that is vascularized, that is, it contains artery, vein and lymphatic capillary.
Therefore, the vascularized microvilli of the small intestine of frog help in the absorption of nutrients.
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In camellia plants, flower color is controlled by a single gene with codominant alleles. A camellia plants with red flowers (RR) is crossed with a camellia plant with white flowers (WW). What are the expected phenotypes of the offspring of this cross?
Answer:
All will have both red and white flowers because the incomplete dominance have two combined alleles given for the offspring with intermediate phenotypes. Then offspring will be pink coloured while in codominance all alleles are expressed in phenotype in the offspring together so the red and white flowers both will be shown.
Explanation:
Find density if mass equal 400lb volume 20
Answer:
just use the formula d=m/v and plug in the numbers to solve the equation
Explanation:
pls answer fast need it now
Answer:
1 8
2 9
3 10
4 11
5 12
6 13
7 14
15
Explanation:
Food travels from the mouth to the stomach via the __________. A. Gallbladder B. Liver C. Intestines D. Esophagus Please select the best answer from the choices provided. A B C D.
Answer:
Esophagus
Explanation:
The esophagus is a muscular tube extending from the pharynx and behind the trachea to the stomach. Food is pushed through the esophagus and into the stomach by means of a series of contractions called peristalsis.
Answer:
The answer is D. Esophagus
Taq polymerase:
A. is denatured at temperatures above the normal human body temperature.
B. is produced in viruses and bacteria.
C. can remove the mineral deposits from rusting pipes.
D. can break down the sludge in oil refinery tanks.
Answer:
Taq polymerase is a thermostable DNA polymerase I named after the thermophilic eubacterial microorganism Thermus aquaticus, from which it was originally isolated by Chien et al .The function of Taq DNA polymerase in PCR is to amplify or synthesize DNA or gene of interest for various downstream applications. It's a type of thermostable DNA polymerase, work at a higher temperature as well. so its A
what is the space between the presynaptic and postsynaptic membranes?
Answer:
The synapse at the neuromuscular junction has three characteristic features of chemical synapses in the nervous system. First, there is a distinct separation between the presynaptic and the postsynaptic membrane. The space between the two is known as the synaptic cleft.
Explanation:
identify the explanations researchers suggested to explain differences in health and mortality by gender.
The differences in health and mortality by gender is a phenomenon for which researchers have many possible explanations.
There have been studies that have indicated that there is enough variation in the average health of males and females to conclude that there are factors at play that are affecting health.
Amongst the many possibilities, scientists have mentioned:
Gender-reliant genetic vulnerability Hormonal factorsDifferences in physiologyas the main possible reasons.
Hormones play a big part in the health of each individual and are vastly different between genders, along with the endless differences in physiology at a molecular level. These factors together may explain why some members of a gender are more vulnerable to genetic illness.
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persistent depressive disorder, or dysthymia, is characterized by
Given what we know, we can confirm that persistent depressive disorder, or dysthymia, is characterized by the presence of prolonged depressive symptoms.
What is a depressive disorder?A depressive disorder is a condition that causes a lack of motivation, happiness, and other positive feelings.Depression is experienced by millions of people from around the world. It can be induced by events in one's life, or be caused by a chemical imbalance in the brain. What separates it from depression?What separates a depressive disorder from a more common case of depression is the frequency by which the symptoms manifest. They are known as depressive disorders when the symptoms are chronic in nature, meaning they manifest repeatedly and for prolonged durations.Therefore, we can confirm that persistent depressive disorder, or dysthymia, is characterized by persistent symptoms relating to depressive episodes, that are chronic in nature and often caused by chemical imbalances in the brain.
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You observe a yellow zone surrounding growth on mannitol salt agar. What does this indicate about the organism
Answer:
The organism is able to ferment mannitol.
Explanation:
Which membrane component is a glycoprotein?
ОА
ОD
ОB
ОC
Answer:
oc
Explanation:
Blood must travel through capillaries at a(n) ________ rate to assist with diffusion of fluid into the interstitial space.
Blood must travel through capillaries at a slow rate to assist with diffusion of fluid into the interstitial space.
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The process of introducing a needed, normal gene, into human cells is called DNA mapping. True False
Answer:
true it is known as DNA mapping
Kinetic energy is described as
Question 1 options:
Decreasing energy
Stored energy
Elastic
Movement
Answer:
elastic
Explanation:
The kinetic energy of a body can be decreased in two cases: When it is stored in the form of potential, for example: elastic or gravitational energy. Or when there are dissipative forces capable of transforming it into other forms of energy, as does the friction force. Which transforms kinetic energy into thermal energy.
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GOD BLESS
There are various types of energy in the surrounding. The different types of energy are as follows:-
Wind energyHeat energyLight energyWater energyThe energy formed by the motion of any particle in a random manner is called kinetic energy. The energy is stored in the particle of the matter.
Hence, according to the question, the correct answer is movement.
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which of the following organisms obtain their energy from producers only
Answer:
heterotrophs.
Explanation:
Organisms that obtain their energy from producers or other consumers are heterotrophs.
the key character that reptiles have and amphibians do not have is a/an
Answer:
Reptiles have scales, and their skin is dry. Amphibians do not, and their skin is often moist with mucus, which keeps them from drying up.
where do photosynthetic organisms get the energy needed to make sugars during the light-independent/dark reactions?
Answer:
They use the glucose they have stored from previous photosynthesis reactions.
Explanation:
The dark reaction takes place external to the thylakoids. The energy from ATP and NADPH is used in this process to fix carbon dioxide (CO2).
What is light-independent/dark reactions?Carbon fixation, reduction, and regeneration are the three stages that make up the Calvin cycle, which is another term for the dark reactions that take place during photosynthesis.
The stroma of the chloroplast is the location where the light-independent process, also known as dark reactions or the Calvin-Benson cycle, is carried out. Carbon-based molecules are formed through a chain of chemical events that begin with carbon dioxide. The production of ATP and NADPH during the light-dependent process supplies these processes with the energy they need to proceed.
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