Answer:
vestigial structures
Ostriches have wings but do not fly, and humans have an appendix with no apparent function, whales have bones for their back legs, which are examples of vestigial structures because they were once functional but are no longer.
What is the importance of the vestigial organs in animals?Vestigial organs have lost much or all of their ancestral function in the evolution process, for example, ostriches have wings that have lost the ability to fly and are now used for balance and courtship displays. The human appendix is another vestigial organ that once had digestive function but no longer does.
Hence, ostriches have wings but do not fly, and humans have an appendix with no apparent function, whales have bones for their back legs, which are examples of vestigial structures because they were once functional but are no longer.
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Which of the following is true about mutations?
All mutations are harmful.
Every genetic mutation is expressed as a phenotype in the organism.
Mutations can be environmental or genetic.
Only some mutations involve a change in the DNA sequence.
Answer:
Mutations can be environmental or genetic
Only some mutations involve a change in the DNA sequence. Therefore option D is correct.
Mutations are changes in the DNA sequence of an organism's genome. Not all mutations are harmful; some can be beneficial or neutral.
Beneficial mutations can lead to advantageous traits, contributing to the organism's survival and evolution. Neutral mutations have no noticeable effect on the organism's phenotype.
Additionally, not every genetic mutation is expressed as a phenotype in the organism. Some mutations may occur in non-coding regions of DNA or be masked by other genetic factors.
Mutations can be caused by various factors, including environmental factors (e.g., radiation, chemicals) and genetic factors (e.g., errors in DNA replication, recombination).
Therefore option D Only some mutations involve a change in the DNA sequence is correct.
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All of the following are commonly used to monitor the health of a forest EXCEPT
A. Age of trees
B. Type of leaves
C. Number of trees
D. Thickness of bark
Answer:
B, type of leaves
Explanation:
A, the age, can be used to show on how long the trees have survived in their habitat
C, Number of trees can show how many are alive, and if the habitat is livable
D, Thickness of bark, The bark is the main part of the tree, if the bark is not thick and doing well, the tree can die
Answer:
Number of trees
Explanation:
Im not 100% sure tho i hope this helps
The viceroy butterfly is not poisonous but has coloration that is almost identical to the poisonous monarch butterfly. Which type of adaptation does this describe?
Mimicry
Warning coloration
Camouflage
Chemical defense
Answer:
mimicry
Explanation:
if im wrong then plz virtually slap me
Answer:
A - Mimicry
Explanation:
Which are examples of lung diseases? Select all that apply
Answer:
1,2
Explanation:
Answer:
asthma and COPD
Explanation:
3. A hydrophilic group is
a, attracted to water.
b. a polar and/or ionized group.
c. found at the end of fatty acids.
d. the opposite of a hydrophobic group.
e. All of these are correct.
In simple dominance, the dominant allele the recessive allele.
O a. decides to not attend anymore parties until her friend returns the sweater she borrowed last winter
O b. discusses terms of surrender
O c. masks
O d. obliterates
Answer:
C. Masks
Explanation:
When we are talking about genetics dominance is a phenomenon of one allele of a gene on a chromosome that masks the effect of a different variant of the same gene on the other copy of the chromosome. Genes don't have parties and sweaters so A is not an option here. They also can't surrender and even if they did they couldn't discuss anything. And they most certainly don't obliterate each other.
what is respiration
Answer:
respiration is a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
In the food chain, how much energy is transferred from the Sun to a producer?
Answer:
1%
Explanation:
Which statement best describes the role of DNA in the body
Answer:
Long term storage of information
Explanation:
Lactase is an enzyme in the small intestine that helps break down the sugar lactose, found in milk
As lactose approches the active site of lactase, which of the following occurs first?
A) the lactose molecule is broken down into glucose and and galactose
B) Lactose shifts to its lowest free energy level to allow lactose to enter the active site
C) Lactose creates a microenvironment as it approches lactase to promote binding
D) Temporary bonding occurs between the active site and the substrate, causing a conformational change
Answer: A. the lactose molecule is broken down into glucose and glactose
Explanation:
Explain how osmosis causes a red blood cell to become hypertonic, become hypotonic, or remain isotonic with the blood.
Answer:
Water moves into and out of cells by osmosis. If a cell is in a hypertonic solution, the solution has a lower water concentration than the cell cytosol, and water moves out of the cell until both solutions are isotonic..............
How much does the giant horse conch weigh?
Answer:
The giant horse conch can weigh up to eleven pounds.
Answer:
eleven pounds
I hope this helps
God bless
Breeders can use a Punnett square to predict the outcome of a genetic cross. If the genotype of both parents was Aa, what would be expected of the genotypes among their possible offspring?
Answer:
AA, Aa, Aa, and aa
Explanation:
If you do the punnet square to solve this, you will see these results!
Answer:B on edge 2020
Explanation:half would have the genotype Aa
A . producers
B . Consumer
C. Bacteria
please help asap , i’ll appreciate a lot :)
Answer:
polymers
Explanation:
mono is the prefix for one
poly is the prefix for many
Answer:
Monomers are small molecules, mostly organic, that can join with other similar molecules to form very large molecules, or polymers. All monomers have the capacity to form chemical bonds to at least two other monomer molecules. ... Heteropolymers are polymers composed of more than one kind of monomer.
Explanation:
this is googles answer
1. If we were exploring the ocean at a depth of about 5,200 m, what part of the ocean would we be exploring?
A. continental shelf
B. mid-ocean ridges
C. ocean floor
D. coastal plain
Answer:
c
Explanation:
hope this helps!!
HELP! WILL GIVE BRANLIEST! (Question 4)
Answer:
The energy from the cell will block substances from being in the animal and stop the toxins from getting into the animal cell.
Explanation:
The job of this energy is to block everything from coming in and out of this cell membrane.
Someone help!!! Please ASAPPP
The Earth does not need a continual supply of materials.
True
False
Answer:
I think it is false because the Earth has a very large population of people and animals and each and every one of them needs nutrients to survive so I think the statement is false
What is the name of the ice sheet?
Answer:
Today, there are only two ice sheets in the world: the Antarctic ice sheet and the Greenland ice sheet. During the last glacial period, however, much of the Earth was covered by ice sheets.
sorry if im wrong and have a wonderful day kind person and sorry for answering late!!!!!
What impact does altitude have on pressure?
Group of answer choices
It stays the same
It warms
It rises
It falls
Answer:
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level.
Explanation:
Answer:
It falls
Explanation:
I just took the test
The nucleotide sequence of a DNA codon is TAG. In an mRNA molecule transcribed from this DNA, the codon has the sequence ______________. In the process of protein synthesis, a transfer RNA pairs with the mRNA codon. The nucleotide sequence of the tRNA anticodon is _____________. The amino acid attached to the tRNA is ____________.
Answer:
The nucleotide sequence of a DNA codon is TAG. In an mRNA molecule transcribed from this DNA, the codon has the sequence 5'-AUC-3'. In the process of protein synthesis, a transfer RNA pairs with the mRNA codon. The nucleotide sequence of the tRNA anticodon is 3'-UAG-5'. The amino acid attached to the tRNA is Isoleucine.
Explanation:
In the process of protein synthesis the mRNA contains the sequence of nucleotides —transcribed from the DNA— that defines the sequence of amino acids that a synthesized protein will have.
Codons are triplets of nitrogenous bases present in mRNA, which encode an amino acid, as well as the start and end of protein synthesis.
Anticodons correspond to triplets of bases present in transfer RNA (tRNA), which correspond with mRNA codons. tRNA is responsible for coupling amino acids to the polypeptide chain being synthesized. In view of this:
- DNA triplet: TAG
- Codon mRNA: 5'-AUC-3'
- Anticodon tRNA: 3'-UAG-5'
- Amino acid: Isoleucine
In order to test Lee for a genetic disorder, Dr. Aikenhed will probably take a sample of cells containing his genomic DNA by swabbing his cheek or taking a blood sample. Why is it important to use non-cancerous cells to test Lee for a genetic disorder instead of the biopsy tissue?
Answer:
Cancer is a chronic disease in which cells reproduce abnormally, exceeding the capacity of the body tissues to assimilate such reproduction, which causes alterations in these cells and in the organs they affect.
Therefore, if a sample is required to determine some type of genetic disorder in the patient, non-cancerous cells should be used, since these will contain genetic material free of any alteration caused by said disease and, therefore, will be a test of greater accuracy to determine said disorder.
It is very essential then to look the genetic makeup to normal cells and compare them to see as it could help in choosing personalized therapy for Lee.
Cancer cell's genes are very unstable in nature and they replicate very fast speed. The use of non cancerous cells will better tell if the cancer is genetic or not when compared to the use of biopsy tissue.
Germline testing is often carried out to know if an individual has a gene mutation that can increase the risk of developing cancers.
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Can gold be created from other elements? why?
Answer:
yes, gold can be created from other elements. The process requires nuclear reactions and is so expensive that currently it would cost a lot more than the price of natural gold available, therefore, unprofitable. Gold is the chemical element with 79 protons in each atomic nucleus. Every atom containing 79 protons is a gold atom, and all gold atoms behave the same chemically. In principle, gold can be created by simply assembling 79 protons, (and enough neutrons to make the nucleus stable).
Which pair of structures would provide a positive identification of a plant cell under a microscope?
endoplasmic reticulum, chloroplasts
large central vacuole, flagellum
chloroplast, large central vacuole
cytoskeleton, cell wall
Answer:
C. chloroplast, large central vacuole
Explanation:
3.11 Quiz on K12 .^.
Answer:
chloroplast, large central vacuole
Explanation:
2.08 Quiz: Plant and Animal Cells
Which is an effect of short-term environmental changes?
A) adaptation
B) speciation
C) extinction
D) death
Answer:
d
Explanation:
Plss answer all! Help!
(1) What are the two main types of cells?
1.
2.
(2) What is a prokaryotic cell?
(3) What is a eukaryotic cell?
(4) What are the similarities between prokaryotic and eukaryotic cells?
(5) What are the parts of a prokaryotic cell?
(6) What are some examples of prokaryotic cells?
(7) What are examples of eukaryotic cells?
(8) What is another name for the cell membrane?
(9) What does selectively permeable mean? Why is the cells ability to do so important?
(10) Describe how the following are important in the makeup of the cell membrane:
1. Phospholipid bilayer
2. Proteins
3. Carbohydrates
4. Cholesterol
Answer:
there are two types of cell one eukaryotic cell that have true nucleus (genetic material enclosed in membrane) and membrane bounded organelles and other is prokaryotic cell that donot have have true nucleus (genetic material dispersed in cytoplasm) and membrane bounded organelles.
similarities between PC and EC is that both contains cell membrane, ribosomes (not a membrane bounded organelle) .
examples of PC are bacteria , paramecium,fungi etc
examples of EC are plant and animal cells
there are two names for cell membrane i.e plasmalemma, cell surface membrane,
selectively permeable or semipermeable means cell only allows those material to pass through its cell membrane which it needs.this cell'ability is important because to protection against the poisonous substance and to maintain cell needs .
If black fur is produced by a recessive allele, which genotype is most likely to produce a black individual?
Answer:
bb
Explanation:
The best reason to assign tasks to each member of a study group is to
make learning easier.
share the workload fairly.
help meetings go faster.
make students study harder.
Answer:
share the workload fairly.
Explanation:
The best reason to assign tasks to each member of a study group is to share the workload fairly across the group.
Sharing the workload this way helps all students to learn and feel part of the study. Through such group works, the academic prowess of student can be assessed. Also, the group collaborating tendency of a student can be better projected.Answer: share the workload fairly
Explanation: I got it right on edge 2020
3. A section of DNA has been mutated.
The original DNA was TAC CTC ACC GAG CGT.
The mutated DNA is TAC CTC ACT GAG CGT.
What is the impact of this particular mutation on the organism? In order to find out, you need to transcribe and translate the codons.
Answer:
The mutation that involves the change in the sequence of DNA bases is reflected both in the transcription of mRNA and in translation, giving rise to an alteration in the protein, which may not function and whose impact on the organism is a morphological or functional alteration.
Explanation:
According to this scenario, the DNA has experienced a mutation by changing the sequence by one of its bases, Cytosine by Thymine, producing in the mRNA a termination codon that interrupts the normal synthesis of the protein, preventing that protein from fulfilling its function. This particular mutation is called Nonsense mutation.
For normal DNA
DNA TAC CTC ACC GAG CGT
mRNA AUG GAG UGG CUC GCA
Protein Met - Glu - Trp - Leu - Ala
For the mutated DNA
DNA TAC CTC ACT GAG CGT
mRNA AUG GAG UGA CUC GCA
Protein Met - Glu - STOP - Leu - Ala
The change of a cytosine by Thymine in the mutated DNA produces that the third codon of the mRNA is altered, encoding a UGA termination codon, which prematurely stops the protein synthesis and originates an incomplete protein, probably not functional, whose impact in the organism is a morphological or functional alteration.