Answers
Answer:
carbon atomic number:6
carbon protons:6
electrons:6
group: 14
carbon valance eletrons:4
oxygen number:8
oxygen protons: 8
group: 16
valanece:6
Potassium: 19
protons: 19
eletrons:19
valance: 1
group:1
Arsenic: 33
protons:33
eletrons:33
valance: 5
group: 15
Iodine: 53
53
53
Valence: 7
group: 17
Calcium: 20
20
20
group:2
valence:2
boron: 5
5
5
group: 13
valance: 3
neon 10
10
10
group:18
valance: 8
Explanation:
Related Questions
Identify the organ of the digestive system.
A)stomach
B)small intestine
C)large intestine
D)liver
Answers
process represents cellular division in body cells?
Answers
Answer:
There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life.
Explanation:
The digestive and excretory systems guided notes
Answers
Answer:
what notes
Explanation:
What is the function of a pollen tube?
to lead sperm cells into the ovary
to create more pollen
to create sperm cells
to lead egg cells to the sperm cells
Answers
Answer:
The function of the pollen tube is to lead sperm cells into the ovary.
Explanation:
In angiosperms, the pollen tube is a structure formed when the pollen grain comes into contact with the stigma and germinates, producing a tubal extension that is related to the embryonic sac where the female gametophyte is found.
The function of the pollen tube is to conduct the male gametophyte —which is found in the pollen— to the embryonic sac, in order to come into contact with the oosphere and produce fertilization.
The other options are not correct because the pollen tube:
Do not create more pollen. Do not create more male spermatophytes. Does not lead the eggs to the male spermatophytes.Answer: to lead sperm cells into the ovary .
Explanation: There needs to be a way for the sperm cells formed by the pollen's generative nucleus to reach the egg cells that are found in the ovary.
Prokaryotic cells are surrounded by a cell membrane.
True
False
Answers
Answer:
True
Explanation:
They are surrounded by a plasma membrane.
If cells were a school building, the cell membrane would most likely be represented by which of the following?
А
intercom
B
lockers
С
teachers and students
D
walls and doors
Answers
Below is a sequence from a template strand of DNA. Write the sequence of the mRNA that would be transcribed from this. Be sure to label the 3’ and 5’ ends.
DNA:3’ A G G T C T T C A C 5’
mRNA:
Answers
Answer:
In the transcription of DNA to mRNA, for the DNA sequence 3'-AGGTCTCAC-5' corresponds to an mRNA sequence 5'-UCCAGAAGUG-3'.
Explanation:
Transcription is the process by which a strand of mRNA, needed to direct protein synthesis in the cytoplasm, is synthesized from a strand of DNA.
The sequence of nucleotides in the RNA chain depends on the sequence of bases in the DNA strand, being placed according to the complementarity of nitrogenous bases, where a purine is complemented with a pyrimidine.
In RNA, the thymine base is replaced by Uracil, the complementary base to adenine of DNA.
ADN mRNA
A U
T A
C G
G C
For this reason:
DNA: 3’ A G G T C T T C A C 5’
mRNA: 5'-U C C A G A A G U G-3'
In which situation might a gene pool contain an allele that causes a lethal
disease?
A. If the allele is in the mitochondria
B. If the allele is expressed after reproduction has occurred
C. If the allele is on the Y chromosome
D. If the allele is expressed in its dominant form
Answers
correct answer is B; if the allele is expressed after reproduction has occurred.
The situation in which a gene pool contain an allele that causes a lethal disease is: (B) If the allele is expressed after reproduction has occurred.
When the allele is expressed after reproduction has occurred, individuals carrying the lethal allele can reproduce and pass on the allele before the disease is expressed. Since the disease may not manifest until later in life or after reproduction has occurred, the allele can persist in the gene pool without being selected against. Over generations, the allele frequency can remain relatively stable, leading to the presence of the lethal allele in the gene pool.
An allele can be defined as a variant form of gene. Alleles can exist in different forms due to changes in the DNA sequence. These changes can be substitutions, deletions, insertions, or other types of genetic mutations.
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2. What fluvial landform is A?
Answers
Answer:
The landform marked with A is an ox-bow lake.
Explanation:
In the image, we can see a river and another fluvial landform right next to it. The river is meandering, moving through the plain in a zig-zag manner. The landform next to it has a half-circular shape, and it seems as it has been attached to the river until recently. In fact, the landform next to the river has been a part of the river until recently, but because of moving too far away from the base it became detached.
The landform in question is an ox-bow lake. This is a lake that has a short lifespan, and it usually has a half-circular shape, being just a few meters away from the river from which it formed. Initially, the ox-bow lake was actually part of the river and its meandering, but as the erosion was moving the water further and further away from the base of the river bed, the water was moving harder and harder, so naturally, the water moves in a direction where it is easier to do so. Little by little, the river starts to move in another direction, closer to its base, and the part of the meander that went too far away gets detached, thus forming an ox-bow lake.
What is the estimated age of Earth?
A.4.6x10^6
B.4.6x10^7
C.4.6x10^8
D.4.6x10^9
Answers
Answer:
D: 4.6 x [tex]10^{9}[/tex]
Explanation:
4.6 x 10^{9} = 4,600,000,000
Earth is approximately, 4.6 billion = 4,600,000,000 = 4.6 x 10^{9}
The estimated age of Earth is 4.6x10⁹ years (D).
Scientists estimate the age of Earth through various methods, including radiometric dating of rocks and minerals. By analyzing the isotopes present in rocks and minerals, scientists can determine the decay rates of radioactive isotopes and calculate the time since the formation of those rocks.
Based on extensive studies and evidence, the current estimated age of Earth is approximately 4.6 billion years (4.6x10^9 years). This estimation is supported by multiple lines of evidence, including radiometric dating of rocks from different geological formations, lunar samples brought back from the Moon, and meteorites.
The age of 4.6 billion years is consistent with the age of the oldest rocks found on Earth's surface and the ages of the Moon and meteorites, which are believed to have formed around the same time as Earth. These dating methods provide a reliable framework for understanding Earth's geological history and the processes that have shaped our planet over billions of years.
It's important to note that scientific estimates and understanding of Earth's age continue to evolve as new evidence and research emerge. However, the current consensus among scientists is that the age of Earth is approximately 4.6 billion years, as indicated by extensive geological and radiometric dating studies.
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Electrical energy is:
the energy form originated by electromagnetic waves or fields
the energy type due to the movement of electrons
the energy form which is present in vibrations of air
Answers
Answer:
The energy form originated by electromagnetic waves or fields.
On a pH scale water is located at 7, hydrochloric acid (HCl) is located below 7 and sodium hydroxide (NaOH) is located above 7.
Group of answer choices
True
False
Answers
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All the terms below apply to anthozoans except
medusa
cnidocyst
septa
pharynx
Answers
Answer:
expect
Explanation:
For the chemical formula C6H12 how many
carbons and hydrogens are there?
Answers
12 hydrogen
I’m pretty sure
Stagnant, shallow areas of water-saturated soil, where the rate of photosynthesis is low, are best characterized as:______.
Answers
Answer:
The correct answer is - bogs.
Explanation:
Bogs or boglands is a wetland that is made up of dead organic matter such as dead plants or parts of the plants like mosses, majority time it is a thick carpet of sphagnum moss. All these form spongy peat which is stagnant.
Most of the water present in this wetland comes from rainfall instead of runoff or streams from the groundwater which makes it a wetland with a shallow area of water-saturated soil. This wetland is known for its less photosynthesis.
What do you think humans and arthropods have in common?
Answers
Muscle and nerve cells are also alike in human beings and arthropods. Both have brains, hearts, digestive tracts, reproductive organs, and muscle groups that do more or less the same matters.
Arthropods are invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. they may be outstanding by means of their jointed limbs and cuticle made from chitin, frequently mineralized with calcium carbonate.
Arthropods are beneficial for different meals that humans eat, especially thru the pollination of plants. greater than 100 food plants are pollinated via arthropods on a yearly basis. Bees, one of the foremost plant pollinators, also produce honey.
Arthropods also are invaluable to human beings, as they're used in many one-of-a-kind human-made products. Examples are: Bees produce honey and their honeycombs contain beeswax, broadly used for making candles, fixtures wax and polishes, waxed papers, antiseptics, and fillings for surgical uses.
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When would the carrying capacity of an area be most likely to change?
when resources remain the same
after a fire or flood
if emigration takes place
for all species at the same time
Answers
Answer:
Required Answer:-An increase in population, resources, natural disasters, and catastrophic events. Weather, natural disaster, human activity. As a population reaches its carrying capacity, resources become more scarce.
Why do you think in the table below, Adenine and Thymine have almost the same number – but not exactly?
Nucleotide
# found in genome
Adenine
701,234,142
Guanine
803,127,160
Cytosine
803,127,162
Thymine
701,234,146
Answers
Increasing
carbon dioxide
concentration
increases the
rate of
photosynthesis
as carbon
dioxide (CO2) is
a
in
photosynthesis.
Above a certain
concentration,
further
increases in
concentration
do not increase
the rate of
photosynthesis
and it stops
being a limiting
factor.
Answers
Answer:
Increasing carbon dioxide concentration increases the rate of photosynthesis as carbon dioxide (CO2) is a limiting factor.
Explanation:
Some limiting factors like carbon dioxide, temperature etc. influence the photosynthetic rate, which may end up reducing the potential amount of carbohydrate produced by photosynthesis. Carbon dioxide is important for this form of biosynthesis: it provides the inorganic carbon that is integrated into carbohydrate molecules.
The photosynthetic rate can be slowed by a decline in the concentration of available carbon dioxide.
6 CO2 + 6 H2O + light → C6H12O6 + 6 O2
Carbon Dioxide + Water + Light Glucose + Oxygen
An anatomy and physiology student, is asked to breathe through a 3-foot long glass tube. What effect does this action have on his blood pH, urine pH, and respiratory rate?
Answers
Answer:
If a student breathes through a 3 feet long glass tube it will affect the physiology of the student in various ways such as a change in blood pH, urine pH, and rate of respiration.
It will result in an increase in the normal volume area of the trachea and bronchi as it is a closed system as a face mask. The increase in this dead volume are will result in double the volume of CO2. Decrease the pH of the blood.
When asked to breathe through 3-foot long glass tube there would reduced oxygen available to the tissue (hypoxia) which had the following effects discussed below.
Hypoxia occurs when there is reduced oxygen available to the body tissues.
When asked to breathe through a 3-foot long glass tube, it can lead to hypoxia.
The effect of hypoxia include the following:
Blood pH: Due to increase in anaerobic respiration in the tissues, lactate production increases leading to a fall in blood pH. Urine pH: Hypoxia leads to increase in renal sodium excretion which helps acid-base balance of the body fluid. Respiratory rate: There is significant increase in respiratory rate to compensate for the decreased tissue oxygen levels.Learn more here:
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Which of the following is found on RNA but not DNA?
Answers
Answer:
Uracil (U) is a nitrogenous base found only in RNA but DNA is deprived of it. In DNA Thymine is found.
Explanation:
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Answers
Organic Farming: Some studies have shown that the foods have more nutrients.
Sustainable Agriculture: Reduces pests, replenish’s plants nutrients, and enhances the soils quality.
Industrial Agriculture: Was designed to meet the be needs of a growing world population.
I wasn’t too sure about “Sustainable Agriculture”, and, “Organic Agriculture” but with some research and general knowledge I am pretty sure I answered them correctly.
I hope this is correct and that this helps you! :)
In which structure would you expect to find a chloroplast?
A. Blood cell from a dog
B. Cell from sunflower leaf
C. Human skin cell
D. Liver cell from a penguin
Answers
Answer:
b.cell from a sunflower leaf
The structure that can have chloroplast is the cell from sunflower leaf. The correct option is B.
What is chloroplast?Chloroplasts are chlorophyll-containing organelles found in plant cells; they are necessary for Earth life because photosynthesis occurs in chloroplasts.
Proplastids give rise to chloroplasts, as do chromoplasts, leucoplasts, as well as other plastids.
Chloroplasts are plant cell organelles that use photosynthetic energy to convert light energy into reasonably stable chemical energy.
They survive life on Earth by doing so. Chloroplasts also perform a variety of metabolic functions for plant cells, such as the generation of fatty acids and membrane lipids.
Chloroplasts are found in all green plants and algae. Chloroplasts can also be found in photosynthesis that don't appear green, such as giant kelp's brown blades or certain plants' red leaves.
Thus, the correct option is B.
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Jorge hits a drum as hard as he can, and it makes a loud sound. Then he hits the same drum with less strength, and it makes a quieter sound. Which statement best explains why hitting the drum at different strengths produces sounds at different volumes? A. The vibrations are the same at each strength. B. The vibrations are different at each strength. C. The pitch is the same at each strength. D. The pitch is different at each strengh
Answers
D is the answer
^_^
^ Above is the right answer
Chewing a saltine cracker.
physical
chemical
Answers
Answer:
Physical
Explanation:
Your not chemically chewing a cracker, you physically moving your jaw to chew the cracker
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Which information can be determined using half-life?
Answers
Answer : In radioactive decay, the half-life is the length of time after which there is a 50% chance that an atom will have undergone nuclear decay. It varies depending on the atom type and isotope, and is usually determined experimentally.
hope it will help you
Answer:d
Explanation:
I did the quiz
Given this sequence of nucleotide bases on a strand of DNA: TCAGAT, state the sequence on it's complementary strand of DNA.
Answers
ununhahhdhcbahhbhjcn hsj bchbhcachhas hca hvahvh
How are seeds produced?
Answers
Answer:
When the ovum is fertilized by pollen tube core, it starts a process of differentiation which leads to the seed generation. In angiosperms, the fruit formation occurs from the ovary of flowers, simultaneously and in a similar way to the formation of seeds.
Explanation:
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Has the research described in this article been
peer reviewed?
Answers
Answer:
Meaning, example of Peer reviewed article
Explanation:
Peer review refers to procedure of scrutinizing a researcher's scholarly work, by other experts & specialists in the similar field.
This provides an important advantage of this is proper scientific, logical verification of the study.
Examples of some peer reviewed journals : Journal of child & adolescent Psychiatric Nursing
Answer:
the article does not say
Explanation:
edge 22
Planarians are a group of ____________ , free-living flatworms that capture their food via a process of wrapping around it, entangling it in slime, and pinning it down before a ____________ extends from the mouth, bringing the prey into a gastrovascular cavity where ____________ digestion occurs.
Answers
Explanation:
Planarians are a group of Turbellaria, free-living flatworms that capture their food via a process of wrapping around it, entangling it in slime, and pinning it down before a prey into a gastrovascu lar cavity where free-living flatworms that capture extends from the mouth, bringing the prey into a gastrovascular cavity where free-living flatworms that capture extends from the mouth, bringing the digestion occurs.