Answer:
Radio waves move at the speed of light which is aproximately 300,000 km per second or 3.8*10^8 m/s
1 ly = 9.461*10^15 m
Then
7.9 light-years = 7.4*10^16 m
By, velocity = distance/ time
time = distance/time
t = 7.4*10^16/3.8*10^8
= 1.9473684*10^24 seconds
Converting seconds to years (1 year = 31536000 seconds)
1.9473684*10^24/ 31536000 years
=6.17096989 ×10^16 years
In general, microtubules disassemble and consequently pull the chromatids to the ends of the spindle during ____.
Answer: The options are not given, here are the options.
.a.prophase
b.prometaphase
c.metaphase
d.anaphase
e.telophase
The correct option is C.
Metaphase.
Explanation:
It is metaphase because during metaphase, the chromosomes lined up together and the two sister chromatids join to a particular spindle fiber. The microtubules them bring the sister together chromatids from the opposite spindle poles. The kinetochore microtubules capture the sister chromatids back and forth til they are able to form alignment along the equator of the cell which is called the equatorial plane.
Why are recessive traits not seen even though they are present in the alleles?
Answer:
Because if the dominant trait (D) is present, it will in a way, overpower the recessive trait (r), and show the dominantly present trait physically but in the alleles, there might be blue in there also but be overpowered for ex: dominant brown eyes with a blue recessive trait so most likey if you have brown since it takes over
Explanation:
Sorry if this sounds confusing, it sounds way better in my head XP
Hope this helps in any way
In what cell cycle checkpoint CDK is present?
Which of the following describes a “green roof”?
a roof that does not affect the carbon level of the atmosphere
a roof that is covered with sustainable living plants
a roof that is painted with a green copper compound to prevent the growth of moss
a roof that is shingled with green tiles
Answer:
a roof that is covered with sustainable living plants
Explanation:
Answer:
A roof that is covered with sustainable living plants
Explanation:
A green roof is considered to be a type of urban green space designed on the roof of a building or home. A green roof is considered a roof that houses many different types of plants and helps promote biodiversity. A green roof is partially or completely covered in vegetation. A green roof also includes a growing medium, a drainage system, and a waterproofing structure. There are also two types of green roofs: extensive and intensive.
Extensive
== use low-growing plants such as mosses, herbs, succulents, and grasses and require minimal maintenance. Intensive == wide variety including shrubs and large trees, and require structural support and routine maintenance and high start-up costs.
What is an effect that results when two genes are located side by side on the same chromosome?
A One gene will cancel out the effects of the other.
B The trait that results causes a genetic disorder.
C Punnett squares can give incorrect predictions of inheritance.
D Both genes will affect the same trait in an additive way.
Answer:
I think its D
Explanation:
please don't be mad if I'm wrong
Answer:
Punnett squares can give incorrect predictions of inheritance.
Explanation:
I just took the test (:
Identify the heat transfer methods in the following situations.
A student boils water in a pan, on an electric stove. Three incidents thus, occur.
Answer:
Please mark as Brainliest!!!!!!
Explanation:
A student boils water in a pan - Convection
A student boils water in a electric stove - Radiation
Question 1
In cellular respiration energy is converted from (2 points)
Answer:
It is converted from glucose and oxygen
What are the two general types of cells in the human body?
which of the following statement is always true
Where is the statement
Which statement is true? Genes are made up of chromosomes. Chromosomes contain a single gene. Centromeres hold instructions for how to make proteins. Genes are present of chromosomes and control traits in an individual.
Water vapor inside magma increases its explosiveness.
true or fasle
Answer: True.
Explanation: When the water vapor bubbles try to rise they are impeded by the linkage of silica chains in the magma and can rise only slowly. The rapid change in confining pressure as the magma body rises to the surface causes the dissolved water vapor bubbles to expand and escape explosively.
what two components make up mass
Explanation:
Mass is made up of atoms, and atoms hold mass. Atomic mass solely based on the atom's protons and neutrons.
Think and discuss: Paramecia that live in freshwater have contractile vacuoles, while those that live in salt water do not. Why do you think this is the case
Answer:
See the answer below
Explanation:
The contractile vacuole primarily functions for the excretion of excess water in organisms that possess the organelle. Paramecia that lives in freshwater would need to constantly get rid of excess water that is likely to be entering the cell due to the fact that the ambient water is hypotonic to their cells. The cytosols of paramecia that live in freshwater have a higher solute concentration and hence, lower water potential than the surrounding freshwater.
The paramecia that live in salt water do not have a need for the contractile vacuole because the problem of excess water entering their cells may not arise. The salt water may not be hypotonic to the cytosol of the paramecia.
Paramecia are single-celled eukaryotic organisms, which are found in aquatic habitats. They are long and slipper-shaped organisms, which have many membrane-bound cell organelles.
The paramecium is the protists, which are found in the marine habitat. The organisms are eukaryotic and have well-developed cell organelles.
The presence of contractile vacuoles in the paramecium regulates the osmoregulation and discharge of excess water. The contractile vacuole controls the intracellular water balance by discharging or accumulating excess water.
The saline water has a high concentration of salt, whereas the freshwater does not have salty compounds.
Thus, the paramecium in saline water has contractile vacuoles to regulate osmoregulation.
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Which event occurs prior to speciation?
A) Different species share the same space.
B) A major change on earth takes place.
C) A population is divided.
D) Organisms of different populations join together.
Answer: C.
Explanation:
I hope this helps plz tell me if its wrong so i can fix it :)
The event that occurs prior to speciation is that a population is divided, which is Option C, as when a population is divided by a geographic barrier such as a mountain range, river, or sea, then this type of speciation takes place.
What is speciation?Speciation is the process by which a single ancestral species gives rise to two or more descendant species, and it occurs when populations of the ancestral species become separated and evolve independently, accumulating genetic differences over time by a physical or geographical barrier along with mutation, genetic drift, or natural selection that separates a population into two or more groups that are no longer able to interbreed leads to speciation.
Hence, the event that occurs prior to speciation is that a population is divided, which is Option C.
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why is the cell membrane called the fluid mosaic model? quick if you can please
Answer:
The fluid mosaic model of the cell membrane is how scientists describe what the cell membrane looks and functions like, because it is made up of a bunch of different molecules that are distributed across the membrane. ... The movement of the mosaic of molecules makes it impossible to form a completely impenetrable barrier.
Explanation:
The cell membrane is called the fluid mosaic model because proteins are arranged as a mosaic of particles that can penetrate inwards and even completely pass through the bilayer.
According to this fluid mosaic model, membranes consist of a lipid bilayer (essentially a double layer of phospholipids) in which various proteins are embedded.
The lipid bilayer is the base of the membrane, proteins are normally found "dissolved" in the lipid bilayer, they act as mediators or facilitators of almost all the functions of the membrane, either by transporting specific molecules.It also highlights that the membranes are fluid, dynamic and their components mobile, a very important characteristic that allows the existence of transitory interactions.Finally, this model of the membrane structure proposes that the arrangement of its components is asymmetric and they can have numerous associated carbohydrates.Therefore, we can conclude that the cell membrane is called the fluid mosaic model because proteins are arranged as a mosaic of particles that can penetrate inwards and even completely pass through the bilayer..
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given that cells can't store app for long periods of time, how do they store energy
Answer:
Given that cells can't store ATP for long periods of time, how do they store energy? Instead of storing ATP, cells tend to store energy as fats, oils, or starches. These are very large molecules and, as a result, do not have as great an effect on osmotic potential.
Explanation:
hope this helps
The structural shape of DNA can be
described as a?
Answer:
DNA is made up of molecules called nucleotides. Nucleotides are attached together to form two long strands that spiral to create a structure called a double helix. If you think of the double helix structure as a ladder, the phosphate and sugar molecules would be the sides, while the bases would be the rungs.
Explanation:
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Which of the following promotes the rapid growth of bacteria?
А
Food held between 70-125° F
B
Cooking foods for long periods of time
с
Foods that are very dry
D
Foods that are held just above freezing
Answer: А . Food held between 70-125° F
Explanation:
Bacteria needs favorable FAT TOM conditions to grow. This means that bacteria needs favorable Food, Acidic conditions, Temperature, Time, Oxygen and Moisture conditions to grow.
When it comes to temperature, there is something called the Danger Zone where bacteria can rapidly grow and multiply by a rate of up to double every 20 minutes.
This danger zone is between 40°F - 140°F which means that food held at 70-125° F is in that danger zone and will promote the rapid growth of bacteria.
A. Food held between 70-125° F promotes the rapid growth of bacteria. Option A is correct.
The temperature range between 70-125° F (21-52° C) is commonly known as the "danger zone" for bacterial growth. Within this temperature range, bacteria can multiply rapidly and pose a risk of foodborne illness. This temperature range provides optimal conditions for bacterial growth and reproduction.
Bacteria thrive in warm and moist environments, and temperatures within the danger zone provide the ideal conditions for their proliferation. When food is held within this temperature range for an extended period, bacteria present on the food or introduced from the environment can multiply quickly, increasing the risk of food contamination.
It is important to note that cooking food for long periods of time (B) and foods that are very dry (C) can actually inhibit bacterial growth. High temperatures during cooking can kill bacteria, while dehydration can reduce the water content that bacteria need for growth and survival. On the other hand, foods held just above freezing (D) slow down bacterial growth but do not promote rapid multiplication.
To prevent bacterial growth and ensure food safety, it is recommended to keep perishable foods either below 40° F (4° C) or above 140° F (60° C) to minimize the time spent in the danger zone. Proper cooking, refrigeration, and temperature control are essential practices in preventing bacterial growth and maintaining food safety.
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Why is it important to perform a restriction digest after cloning your gene of interest fragments into the TOPO vector?
Answer:
Restriction enzymes (restriction endonucleases) are proteins that cut DNA at (or close ... To be able to clone a DNA insert into a cloning or expression vector, both have ... you could carry out the two digestions simultaneously (double digestion)
Explanation:
Viruses with dsRNA genomes evolved a long time ago and can be found in parasitic relationships with species from a variety of taxa. What mechanism do eukaryotes use to combat such viruses
Since, the question is incomplete the complete question is as follows:
Viruses with dsRNA genomes evolved a long time ago and can be found in parasitic relationships with species from a variety of taxa. What mechanism do eukaryotes use to combat such viruses?
Select all that apply.
RNA interference
posttranslational silencing
RNA-induced silencing
methylation of CpG islands
position effect variegation
genomic imprinting
Answer:
RNA interference
post translational silencing
RNA-induced silencing
Explanation:
Viruses are the pathogenic living organisms which invade the host cells of plants, animals, humans, and of other organisms to produce their own genetic material and progeny viruses. The following are the methods using which the eukaryotic organisms can prevent themselves from infections.
1. RNA interference: In this viral RNA is cleaved by the use of complementary RNA sequence present in the genome of the host cell.
2. Post translational silencing: In this the gene products of viruses are silenced.
3. RNA induced silencing: It involves the inhibition of replication of RNA of virus by the host cell machinery.
I need help with this question. Can you guys help me?
Answer:
C
Explanation:
DNA polymerase can only add nucleotides to the free 3' end
What type of macromolecule is cortisol?
In Holstein cattle the spotting of the coat is due to a recessive gene, while a solid-colored coat is dominant. Two heterozygous solid animals are crossed. What would be the expected genotypes and phenotypes of the offspring?
Answer:
In Holstein cattle when two heterozygous animals are crossed for the characteristic coat color, the offspring will be individuals with solid coat and spotted coat in a 3:1 ratio.
Explanation:
Since in Holstein cattle the solid color coat is dominant (S), and the spotted coat is recessive (s), each heterozygous individual has the genotype Ss.
The result of crossing two individuals of Holstein cattle heterozygous can be seen in Punnet's Square:
Ss X Ss
Alleles S s
S SS Ss
s Ss ss
Genotypes
Ss 50%SS 25%ss 25%Ratio of genotypes SS:Ss:ss is 3:1:1
Phenotypes
Individuals with solid color coat 75% (50% Ss and 25% SS). Individuals with a spotted coat 25%.Ratio solid color:spotted color 3:1
Paraphrase the first law of thermodynamics.
Ability of the body to maintain a relative stable internal environment is
Answer:
Homeostasis
Explanation:
heres the map for the last question
Answer:
what question is that hello
Optimum germination conditions differ between species. Sometimes this depends on the evolutionary history of the plant species. One species has higher germination rates when the seeds are exposed to soil with ash present. This is an example of _______________.
Answer:
seed dormancy
Explanation:
Seed dormancy represents an evolutionary adaptation capable of preventing seed germination. Seed dormancy enables to overcome unfavorable periods for germination, thus being critical for plant survival. In this regard, it has been shown that in plants living in fire-prone ecosystems (such as, for example, montane forest species), seed germination may be triggered by ash after fire, which is required to break seed dormancy.
Which is the closest synonym for the word pristine? A Perfect B Casual C Peculiar D Clumsy
Answer:
A. perfect
Explanation:
A virus can infect any cell it encounters.
True
False
How many cell divisions occur during meiosis?
Answer:
b
Explanation: