Answer: C. Birds Have Feathers
Explanation: k12 test / k12 unit test 5.19
what hypothesis did darwin investigate by studying the breeding of pigeons with distinctive traits?
Answer:
New species can appear gradually through small changes in an ancestral species.
Explanation:
Where can we find evidence of changes in conditions on earths surface
Answer:
Rock Layers of Earths Crust
What offspring would codominance be?
Answer:
What offspring would co-dominance be?
All black and white offspring
Explanation:
Any substance with constant composition
Answer:
Pure substance
Explanation:
An event lasts 4 hours and 20 minutes. How long did the event last in seconds?
a) 14,400
b) 15,600
c) 72,000
d) 86,400
The event last in 15,600 seconds.
Answer: Option B
Explanation:
We know that there is 60 seconds in one minute i.e., 1 minute = 60 seconds
There is 60 minutes in one hour. i.e., 60 minutes = 1 hour.
Given : An event lasts 4 hours and 20 minutes
4 hours contains 240 minutes,
[tex]4 \times 60=240 \text { minutes }[/tex]
When the above expressed in seconds,
[tex]240 \times 60=14400 \text { seconds }[/tex] ------>eq. 1
When 20 minutes expressed in seconds,
[tex]20 \times 60=1200 \text { seconds }[/tex]------->eq. 2
Adding both eq. 1 and 2, we get
4 hours and 20 minutes = 14400 + 1200 = 15600 seconds
The blood type trait is controlled by more than two alleles for a given gene and therefore is called multiple alleles.
True
False
Answer:
TRUE
Explanation:
Answer: it's true :0) hope I helped
When an apple is cut, oxygen comes in contact with the fruit’s inner tissue and browning occurs. One particular enzyme in the apple cells, polyphenol oxidase, begins breaking down the tissue. This process may be the plant’s way of keeping pests away from a cut or broken area. What could you do to stop this browning action?
Answer: The cut slices should be refrigerated to slow the reaction. Also, you can coat them with lemon or pineapple juice.
Explanation: The acids in these juices slow the reaction and the antioxidants inhibit it.
Final answer:
To stop the browning action when an apple is cut, you can limit its exposure to oxygen, use antioxidants, and use ethylene blockers. These measures will help prevent the activity of the enzyme that causes browning and preserve the appearance of the cut apple.
Explanation:
To stop the browning action that occurs when an apple is cut, you can take a few measures:
Limiting exposure to oxygen: Browning is caused when oxygen comes into contact with the fruit's inner tissue. You can prevent this by placing the cut apple in an airtight container or wrapping it tightly with plastic wrap to limit its exposure to oxygen.
Using antioxidants: Browning is also caused by the enzyme polyphenol oxidase. Antioxidants, such as ascorbic acid (vitamin C), can inhibit the activity of this enzyme and prevent browning. You can apply lemon juice or a mixture of lemon juice and water to the cut apple to provide a source of antioxidants.
Using ethylene blockers: Ethylene is a gas that is released by the apple when it is cut, and it promotes browning. You can use ethylene blockers, such as ethylene-absorbing packets or a solution of citric acid, to prevent ethylene from reaching the cut apple and reduce browning.
Where is the cell wall?
Answer:
Outside the cell membrane.
Explanation:
It stops unessesary things from entering the cell. It acts like a wall. It structural wall surrounds types of cells, outside the cell membrane. Provides the cell with support and as well filters the cell.
How do scientists construct recombinant DNA molecules?
by using RNA from plants
by combining the proteins from two different organisms
by combining the DNA of two different organisms
by combining the RNA of two different organisms
Answer:
by combining the DNA of two different organisms
Explanation:
Recombinant DNA is when researchers edit a gene to contain a novel sequence, such as one from another organism
A good example of this in the lab is when scientists combine genes with a fluorescent gene called green fluorescent protein, GFP. This is from jellyfish. The gene sequence can be tracked on to the end of a gene of interest in a cell population or organism. When the gene is transcribed and translated, the GFP sequence will also be transcribed and translated. This means it will be fluorescent green and easy to track and visualise in cells.
Which of the following products were created through marine biotechnology? Penicillin, plasma television, fluorescent dyes, lithium batteries
Penicillin isn’t the answer, I tried
Answer: omega 3's
Explanation:
-combination of marine & food biotechnology
-polyunstaturated fatty acids (PUFAs)
-3 types in human physiology
->α-linolenic acid (ALA) - found in plant oils
->eicosapentaenoic acid (EPA)
->docosahexaenoic acid (DHA)
-N-3 fatty acids have health benefits & are considered essential fatty acids, meaning that they cannot be synthesized by the human body - but are vital for normal metabolism
->table of dietary source of Omega-3
-->fish is commonly used but dangerous as you can contract mercury poisoning
Fluorescent dyes are the most likely products to have been created through marine biotechnology, specifically organobromine compounds like Tyrian purple from marine organisms. The correct answer is option c) Fluorescent dyes.
The product that was likely created through marine biotechnology is fluorescent dyes. Specifically, the organobromine compounds derived from marine organisms have been used historically, with the most famous example being Tyrian purple, a dye extracted from marine gastropods since ancient times.
Despite products like penicillin, plasma television, and lithium batteries being significant in their own right, they were not directly a result of marine biotechnology. Penicillin, for example, was discovered as a secretion of the fungus Penicillium and not from marine organisms.
Thus, the correct answer to the student's question is option c) Fluorescent dyes.
"Your abilities can't be genetic, because they aren't a disease," says Ellie to her talented
husband, son, and daughter. She is incorrect because
Answer:
"Abilities"are inherited by parents
Explanation:
Which statement describes absolute and apparent brightness?
O Absolute brightness and apparent brightness are identical ways to describe the brightness of a star
Absolute brightness and apparent brightness change with the distance from the star to the observer.
Absolute brightness depends on the distance from the star to the observer, whereas apparent brightness is
always the same
Absolute brightness is the actual amount of light produced by the star, whereas apparent brightness changes
with distance from the observer
Answer: D
Answer:
why even ask if you already now if that sounds rude sorry
Explanation:
Which of the following objects might orbit a planet?
Question: Which of the following objects might orbit a planet?
A. a moon B. an asteroid C. a galaxy D. a star
Answer:
"Moon" that orbit a planet.
Explanation:
Moon has made its orbit around the Earth that we live, But the asteroid and the stars given in the option revolve around the sun. And the place where we live is the galaxy. Moon has made its orbit around the earth and also is natural satellite. Among all it is the fifth largest in the count of the largest satellite present in our solar system. It is also referred as the largest planetary satellite which is when compared with the size of the planet.
Answer:
The answer would be a moon
Explanation:
:)
Cause of death to the cell wall
The causes of death to cell wall includes imbalance of electrolytes and Some antibiotic classes .
Explanation:
The layer that encapsulates the membrane of the cell is called cell wall. The structure of the cell wall may vary from flexible to rigid. It supports the cell in two different ways. It protects a cells and it helps in forming their structure. Cell walls are not present in animals. Cell walls are present in eukaryotes and prokaryotes.
Cell wall helps the cells to prevent the expansion of cells beyond certain size, when there is an entering of water happens. When there is no balance between the electrolytes then death of cell wall happens. It ca also cause due to antibiotic classes. These will restrict the synthesis process of those blocks that builds cell wall.
If you mix the Pattersonase gene sequence with EcoRI, how many
fragments will you end up with? How long will the be?
Answer:One EcoRI site can be found in 4096 bp.As EcoRI can not cut a sequence if it is not complete, so 732421 recognition sites in human genome can be found. As you know human genome is linear genome, and when you digest it with Restriction Endonuclease having one recognition site, it always gives two fragments.
Explanation: (Idek how to explain it tbh..sorry :C )
The diagram displays the copying of a DNA sequence from a gene before and after the copy is made. The * represents an error that was made. Identify what this error is called. A) replication B) recombination C) point mutation D) transfer mutation
Answer:
The correct option is C) Point mutation
Explanation:
A mutation can be described as any change or error which occurs in the DNA of a person. A point mutation can be described as a kind of mutation in which only one of the nucleotide base is changed, added, or deleted from a certain point of the DNA. The consequences of the point mutation depend on the nucleotide being changed and the difference it makes on the codon sequence. if a point mutation occurs in an intron region then it will be less likely to be harmful.
1.
Which season has the least amount of daylight?
summer
spring
winter
2.
In the summer, the _____ is tilted toward the Sun.
Northern Hemisphere
Southern Hemisphere
Western Hemisphere
3.
What can be expected in the Southern Hemisphere from June to September?
cool temperatures
warm temperatures
no temperature change
Answer:
winternorthern hemispherecool temperatureSelect whether each of these questions is scientific or nonscientific.
Does my dog like me?
Are bats blind?
What do fish eat?
Do unicorns really exist?
Can bees communicate by doing a special dance?
Answer:
the first and fourth questions are nonscientific, the rest are.
Explanation:
Does my dog like me?" - Nonscientific. Are bats blind? - Scientific. What do fish eat? - Scientific. Do unicorns really exist? - Nonscientific. Can bees communicate by doing a special dance? - Scientific.
The answers to whether each question is scientific or nonscientific are as follows:
1. ""Does my dog like me?"" - Nonscientific. This question is about a subjective experience and personal feelings, which cannot be empirically tested or observed.
2. ""Are bats blind?"" - Scientific. This question can be answered through biological research and empirical observation. Bats are not blind; many species use echolocation to navigate and can see.
3. ""What do fish eat?"" - Scientific. This question can be answered through biological and ecological research. Different species of fish have different diets that can be studied and documented.
4. ""Do unicorns really exist?"" - Nonscientific. Unicorns are mythical creatures, and their existence cannot be tested or observed in the natural world.
5. ""Can bees communicate by doing a special dance?"" - Scientific. This question can be answered through entomological research. It is well-documented that bees, particularly honeybees, perform a waggle dance to communicate the location of food sources to other members of their hive.
Scientific questions are those that can be answered through empirical research, observation, and experimentation. They are based on phenomena that can be measured and tested. Nonscientific questions, on the other hand, often involve subjective experiences, personal beliefs, or hypothetical entities that cannot be empirically tested or observed.
This can contribute to desert formation:
A. Farming
B. Fossil Fuels
C. Deforestation
I know that B. is wrong but a or c is correct
Answer:
C
Explanation:
Due to the erosion of soils, no trees to protect the ground from drying out.
Answer:
c
Explanation:
because the roots of plants and trees hold the ground together, but without them it blows around and dries with nothing to hold it together, forming a desert
Blood typing is an example of __________________. This is where there is one gene but that one gene can have several different characteristics
a
multiple alleles
b
dihybrid trait
c
homozygous dominance
d
incomplete dominance
Question 2
A student can study a karyotype to learn about the . . .
a
Molecular structure of a chromosome.
b
Genes that are present in a particular strand of DNA
c
Medical history of an individual.
d
Chromosomes present in a somatic cell.
e
Eye and hair color of an organisms
Question 3
A pedigree can be used to
a
determinie whether a trait is inherited.
b
show how a trait is passed from one generation to the next.
c
determine whether an allele is dominant or recessive
d
all of the above
Question 4
Down syndrome occurs as a result of nondisjunction of chromosome 21 during cell division.
a
True
b
False
Question 5
Variation in human skin color is an example of a(n)
a
intermediate inheritance.
b
codominance.
c
polygenic inheritance.
d
multiple alleles.
How many chromosomes are shown in a normal human karyotype?
a
2
b
23
c
44
d
46
Question 8
Review the diagram.
Select the correct response regarding the relationship between photosynthesis and cellular respiration.
a
the reactants and products of photosynthesis has no relationship with the reactants and products of cellular respiration.
b
the products of cellular respiration are the reactants of photosynthesis.
c
the reactants of photosynthesis are the reactants of cellular respiration.
d
the products of cellular respiration are the products of photosynthesis.
Question 9
Is the trait in the pedigree below dominant or recessive?
a
dominant
b
recessive
c
not enough information to tell
Question 10
In fruit flies, the color of the eyes is sex linked (on the X chromosome). A cross of the flies in the image will produce
a
100% white eyed flies
b
100% of the females with white eyes, 50% of the males with white eyes.
c
100% red eyed flies
d
100% of the females with red eyes, 100% of the males with white eyes.
Question 11
Study the information on the chart and the graphic. What can you infer about photosynthesis?
a
The closer the light source, the higher the amount of oxygen gas.
b
The closer the light source, the higher the amount of carbon dioxide gas.
c
The closer the light source, the lower the amount of oxygen gas.
d
The closer the light source, the lower the amount of carbon dioxide gas.
Question 12
What type of inheritance is shown in the pedigree?
a
sex linked dominant
b
sex linked recessive
c
autosomal dominant
d
autosomal recessive
Question 13
This human karyotype is unusual because chromosome set –
a
5 has chromosomes of different shapes
b
10 is missing genetic material
c
14 has enlarged centromeres
d
21 has an extra chromosome
Question 14
The main goal of the Human Genome Project was to
a
treat genetic disorders.
b
insert human genes into bacteria.
c
identify the DNA sequence of every human gene.
d
to determine the number of chromosomes in humans
Question 15
What syndrome does this karyotype show?
a
down syndrome
b
turner's syndrome
c
klinefelters syndrome
d
normal male
Answer:
A...Chromosomes present in a somatic cell. student cant do other complex things karyotye14.identify the DNA sequence of every human gene.
8.the products of cellular respiration are the reactants of photosynthesis.
5.Polygenic inheritance
for question number for I can say that down syndrome is caused when abnormal cell division results in an extra copy of chromosome 21.
If i was any help..mark me brainliest
A scientist injected a drug into a mouse that inhibits the formation of mRNA in either the sperm or egg cells.
What could be the result of this alteration?
Answer:
The mouse will not be able to form sperm or egg or abnormal sperms or egg will be formed.
Explanation:
For the synthesis of proteins, the DNA is transcribed and an mRNA is formed. This mRNA is translated by the ribosomes and a protein is formed. If mRNA is not formed, then the protein will not be able to form.
If the formation of mRNA is inhibited for the sperm or egg cells they will either not form the right kind of sperm or egg cells or will not produce them at all depending on the mRNA that is being inhibited from the formation.
(I NEED THIS ANSWERED QUICKLY! I WILL GIVE BRAINLIEST AND EXTRA POINTS TO THE FIRST CORRECT ANSWER!)
Which is the balanced chemical equation representing the decomposition of red solid mercury (II) oxide? HgO Hg + O2
A. HgO Hg + O2
B. 2HgO Hg + 2O2
C. 2HgO 2Hg + O2
D. 2HgO 2Hg + 2O2
Answer:
The correct option is C) 2HgO→ 2Hg + O2
Explanation:
A balance equation can be described as a reaction in which the number of atoms of an element are same for the reactant and the product side.
For example, in the reaction :
2HgO →2Hg + O2
There are 2 atoms of mercury in the reactant side and the product side.
There are two atoms of the element oxygen at the reactant side, the product side also has two atoms of oxygen. Hence, this reaction is properly balanced.
Refer to figure 10.13. Which photos (A-I) best illustrate the methods of fossilization or fossil evidence listed below
Answer:
Permineralization:
A. Trilobite fossil
F. Trilobite fossil
B. Fossilized wood
Cast:
G. Fossil dung
Carbonization:
C. Fossil bee
I. Fossil fish
Impression:
D. Fossil brachiopods
Amber:
H. Fossil spider
Indirect impression:
E. Dinosaur track
G. Fossil dung
Explanation:
Permineralization:
The most common process of fossilization in which the remains of the organism, particularly, the internal cavities are replaced by the deposition of minerals carried by water or sediment.
Cast:
Casts are formed when the actual remains and bones of the organism are dissolved, creating a depression or a mould that gradually fills with sediments to form a cast of the exact shape of the original.
Carbonization:
The fossilization process in which only the residual carbon of the living organism remains leaving behind a thin carbon layer.
Impression:
Fossilization that involves the preservation of the prints or impressions of animals and plants when the print is made in silt or mud. This mud or silt hardens to rock.
Amber:
Amber is living organism preserved in fossilized tree resin.
Indirect Impression:
Indirect impressions are two dimensional imprints that do not contain any organic material from the organism itself but give a clue of its existence and biological activity. Footprints, tracks and excrement is fossilized in this manner.
The question focuses on matching photos to different methods of fossilization, requiring reference to textbook figures and flowcharts. The answer would involve examining photo characteristics and comparing them with textbook descriptions of fossil preservation processes.
Explanation:The student's question pertains to identifying methods of fossilization and analyzing fossil evidence, based on images from a textbook. The question requires matching specific photos illustrating different fossilization processes to a list of such methods. To address such a question, one would typically refer to the figures provided in the textbook, which likely include visual examples of petrification, mold and cast fossils, amber preservation, permineralization, and other types of fossil evidence. Utilizing the flowcharts and exercises mentioned, such as Figure 6.10 and Exercise 6.2, would aid in understanding the mode of preservation. Additionally, figures showing the evolutionary progression of species through fossil records, such as whales and horses, provide context for understanding the diversity and history of life on Earth as evidenced by fossils.
When helping a student with this type of inquiry, a tutor would guide them to look at the characteristics of each photo, such as whether there is presence of original biologic material, positive and negative relief, and mineral composition, and compare these with the types of fossilization processes described in the textbook. Being able to identify such features enables one to determine fossil evidence and likely methods of fossilization. Critical thinking may also be applied in assessing whether certain fossils suggest organisms are now extinct, by identifying unique features not found in modern-day species.
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traits that have three or more phenotypes may be the result of alleles
Answer:
Traits that have three or more phenotype may be the result of multiple alleles.
Explanation:
When three or more alternative genes occupies the same locus then it is known as the multiple alleles.Normally only two type of alleles are found in an organism.The multiple alleles results in the formation of appearance of multiple looks in an organism (phenotype).The blood type in human beings are the common example of multiple alleles (ABO system of blood groups is controlled by three alleles).In which structure would you find a nucleus?
Question 10 options:
bacterial cell
plant cell
prokaryote
virus
In the given options, a nucleus can only be found in a plant cell. Unlike eukaryotic cells (like plant cells), bacterial cells, prokaryotes, and viruses do not have a nucleus to house their DNA.
Explanation:In biological terms, a nucleus is an organelle that houses the DNA of a cell, serving as the information and administrative center. The nucleus is found in eukaryotic cells, which include animal and plant cells.
However, the other options listed, namely bacterial cells, prokaryotes (which includes bacteria and archaea), and viruses do not have a nucleus. Prokaryotes have a nucleoid region where their DNA is located, which lacks a nuclear membrane, and viruses merely have a protein coat housing their genetic material.
Therefore, in the given options, a nucleus can only be found in a plant cell.
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The____ process is the most animals makes diploid zygotes
A.) Life
B.) Fertilization
C.) Asexual
Answer: A. Fertilization
Need help ASAP please on all the 3 questions
Thank you.
Answer no 8:
Y y
y Yy yy
y Yy yy
The results from the following punnet square show that for the offsprings have equal number of yellow and green plants, the yellow seeded plant will be heterozygous dominant (Yy) for the trait and the green seeded plant will be recessive having the genotype yy.
Answer No 9:
Y y
Y YY Yy
y Yy yy
The results of this punnet square show that for about 25% of the offsprings to have green seeds, the genotype of both the parents shoub be heterozygous dominant i.e Yy.
Answer No 10:
A dog who is homozygous for the dominant thick coat will all thick coat offsprings when crossed with the thin type dog. Whereas a dog which is heterozygous will show a 25% of the offsprings to be thin.
what forms inside the crater of a large volcano
Answer:
A lava dome
Explanation:
I hope this helps!
Answer:
Lava dome
hope it's help you guys
i hope you help me get some thanks .
The thermal energy of matter depends on how fast its particles are moving on average, and this is measured by ________________________
a) speed
b) energy
c)temp
d) none of the above
Answer: Temperature (C)
A geologist is studying a sand dune. The sand dune was
formed as wind deposited sand against an obstruction.
What process created the sand dune?
o abrasion
O deflation
o weathering
o compaction
Answer: Deflation
Explanation: it’s correct
A geologist is studying a sand dune. The sand dune was formed as wind deposited sand against an obstruction deflation.
What causes the sand dune?Sand dunes are created whilst wind deposits sand on pinnacle of every different till a small mound begins offevolved to form. Once that first mound forms, sand piles up at the windward facet increasingly till the brink of the dune collapses beneathneath its very own weight.
In geology, Deflation may be described because the procedure with the aid of using which loose, mild weight and small debris fashioned with the aid of using the weathering of erosion of pinnacle-soil of the earth crust or the dirt and sand debris are carried from one vicinity to some other with the aid of using the movement of wind.When those debris hit or strike an obstruction like a mountain or hill they crumple at the floor.Gradually with time, several such debris crumple and collect at the floor after hanging an obstruction and finally bring about the formation of a sand dune.Read more about the deflation:
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