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Related Questions
The table shows data Chargaff collected on DNA nitrogenous bases in five organisms.
Percentages of Bases in Five Organisms
Source of DNA A T G C
Streptococcus 29.8 31.6 20.5 18.0
Yeast 31.3 32.9 18.7 17.1
Herring 27.8 27.5 22.2 22.6
Human 30.9 29.4 19.9 19.8
E.coli 24.7 23.6 26.0 25.7
Which statement did Chargaff conclude based on these data? Note that a letter in brackets, such as [A] or [C], refers to the concentration of one of the nitrogenous bases.
A. in DNA molecules, [T] > [A] > [G] > [C]
B. in DNA molecules [A] = [G], and [C ] = [T]
C. in DNA molecules, [A] = [T], and [C ] = [G]
D. in single-stranded DNA molecules, [A] = [T] = [C ] = [G]
Answers
Answer: in DNA molecules, [A] = [T], and [C ] = [G]
Explanation:
Migrating fibroblasts can be treated with various chemical agents while they are migrating. Explain what you expect for each of the following conditions.
a. The cells are injected with large amounts of purified gelsolin, and the live cells are observed periodically.
b. The cells are treated with latrunculin A, the drug is washed out, and the live cells are observed periodically.
c. The cells are treated with a chemical fixative and prepared for electron microscopy. Their actin filaments are decorated with myosin S1 subfragments, and you examine in which direction the arrowhead-shaped decorations are pointing in the filopodia of the fixed cells.
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Answer:
c
Explanation:
following the laws of Convervation of matter, 10 grams of iron combined with 5 grams of sulfur will yield _____ grams of iron sulfide
Answers
Answer:
15
Explanation:
Since the law of conservation of mass applies to all the chemical reactions this will also end in 10+5 equalling 15 grams
I will give Brainliest!!!!!!!
Answers
Answer:
synthetic:.
chemically processed
not environmentally friendly
durable
nylon polyester plastic
resistance to insect
natural
natural obtained
environmentally friendly
not durable
cotton
food for insect
I am not sure about wool and food for insect sorry
hope it helped
Which would be an adaptation for living in the tundra?
funnel shaped leaves to help water runoff
deep roots to go into the permafrost
hibernation to lower metabolism in the winter
large ears to release heat
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Answer:
C: Hibernation to lower metabolism in the winter
Explanation:
Answer:
C is correct
Explanation:
Land breeze happens at night.
A. True
B. False
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Answer:
true
Explanation:
the answer is A
land breeze is the opposite of sea breeze.
sea breeze accurs during the day
Land breeze occurs during night
Have energy to dissolve metals and other subtances?
Answers
Explanation:
Dissolving metals is a chemical property that takes place when water or strong acids react with metallic objects. Chemical forces pull metal atoms from the object, causing it to break apart and leave the atoms floating freely in solution. Solubility depends on the acids and metals involved. Lead and iron react easily, while platinum and gold are much harder to dissolve.
Please help honest answers only!! How could wildfire immediately impact competition in a forest ecosystem? (1 point)
Competition would decrease. Many ecosystems rely on wildfire to restore nutrients and germinate seeds; therefore, wildfire would
increase resources available, lowering competition
Competition would increase. Wildfire would increase the scarcity of resources, causing individuals to compete at higher rates.
Competition would remain the same. Wildfire would increase the scarcity of resources and decrease individuals competing.
effectively balancing each other out.
Competition would decrease. Wildfire would decrease the number of individuals competing for resources, making more resources
available per individual.
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Answer:
I think its b. Competition would increase. Wildfire would increase the scarcity of resources, causing individuals to compete at higher rates.
Explanation:
not 100% sure tho
Wildfires can immediately impact competition in a forest ecosystem because wildfires would increase resource scarcity, causing individuals to compete at higher rates.
What are the consequences of forest fires?In addition to destroying native vegetation and killing many wild animals, a forest fire can also cause serious financial damage and even endanger the lives of people and domestic animals.
With this information, we can conclude that wildfires can immediately affect competition in a forest ecosystem because wildfires would increase resource scarcity, causing individuals to compete at higher rates.
Learn more about ecosystem in brainly.com/question/1673533
Air pressure decreases as
a.
velocity increases.
b.
elevation increases.
c.
acceleration decreases.
d.
gravity increases.
Please select the best answer from the choices provided
A
B
C
D
Answers
Answer:
velocity increase pressure decreases
Answer:
b. elevation increases
hope this helps you☺️☺️
20. Process through which pollutants get increasingly more concentrated each step up the food chain.
bloaccumulation
risk assessment
toxicity
biomagnification
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Answer:
bioaccumulation of chemicals is the problem concerning all living organisms. This is the result of dynamic equilibrium between the uptake and elimination. The extent to which bioaccumulation occurs determines the toxic effects which are manifested. In some cases, the mechanisms of protection from certain undesirable substances deposited in special sites, to prevent their participation in the metabolic reactions, have evolved. The knowledge on bioaccumulation enables to assess the risk related with the presence of various chemicals in the environment, food, and at workplace and to present quantitatively the ability to control the use and emissions of chemicals.
What is the primary goal of human communities?
O A. To safeguard human culture and language
O B. To satisfy human needs by working together
O c. To make and follow rules through political organization
O D. To understand group behavior through observation
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PLEASE HELP!!
Which of these is necessary for gas exchange in the respiratory system?
a.At least 30% oxygen in the air
b.The exchange surface must be moist c.The air must be cooler than body temperature
d.The blood cannot be moving
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What is the function of histones- proteins that aide in dna replication
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Answer:
Nucleosomes in turn are wrapped into 30-nanometer fibers that form tightly packed chromatin. Histones prevent DNA from becoming tangled and protect it from DNA damage. In addition, histones play important roles in gene regulation and DNA replication. Without histones, unwound DNA in chromosomes would be very long.
Write the tRNA anticodons for the following strand of mRNA.
AGA GAU UCA GCU AGC ACG AUA
Answers
Answer:
UCU CUA CGA UCG UAU
Explanation:
Those are the answers above.
Which of these might be considered benefits of climate change? **Select the
two correct responses.**
A. Increased crop growth
B. Fewer business opportunities
C. Increased ocean acidity
D. Increased demand for building construction
E. The spread of invasive species
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Answer:
Hi, there the answer is
A.Increased crop growth
D. Increased demand for building construction
Hope this helps :)
Explanation:
The mutation rates in Drosophila will most
likely increase after exposure to
a. Ultraviolet radiation
b. Yeast growing on a nutrient medium
C. Oxygen gas
d. Extremely cold temperatures
Answers
Answer: A. Ultraviolet Radiation
The mutation rates in drosophila will most likely increase after exposure to ultraviolet radiation.
Explanation:
Mutation are spontaneous random sudden changes that occur in the genetic makeup of an organism's. they are changes in the genetic sequence, and they are main cause of diversity among organism
Hope this helped!!!!
Ribosomes provide the scaffolding on which tRNAs interact with mRNA during translation of an mRNA sequence to a chain of amino acids.
a. True
b. False
Answers
Answer:
a. True
Explanation:
Ribosomes are ribonucleoprotein complexes composed of RNA and proteins, which have two main roles 1-decode the message of the messenger RNA (mRNA) molecule and the formation of peptide bonds in the protein. For this purpose, each triplet of nucleotide bases or 'codon' in the mRNA sequence is used to assemble specific amino acids in the nascent polypeptide chain. Although different, both prokaryotic ribosomes and eukaryotic ribosomes are composed of two subunits: one small subunit that decodes the mRNA into a specific amino acid chain, and one large subunit that forms the peptide bonds in the polypeptide chain. Each ribosomal subunit is in turn composed of ribosomal RNAs and proteins. These ribosomal RNAs act as scaffolds by combining with proteins that assemble into ribosomes (i.e., small and large ribosome subunits).
Chemostat culture with protozoa Tetrahymena thermophila protozoa have a minimum doubling time of 6.5 hours when grown using bacteria as the limiting substrate. The yield of protozoal biomass is 0.33 g per g of bacteria and the substrate constant is 12 mg l1 . The protozoa are cultured at steady state in a chemostat using a feed stream containing 10 g l1 of nonviable bacteria. (a) What is the maximum dilution rate for operation of the chemostat
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Answer:
The correct answer is - 3.3 g/L.
Explanation:
It is known that if endogenous metabolism is not important then,
µnet = µmax = 0.693/doubling time.
Given:
doubling time = 6.5 hr, therefore,
µmax = 0.693/6.5 = 0.1/h
Formula:
First, maximum dilution rate Dmax,
Dmax = µmax*[S0]/{Ks + [S0]}.........(1)
Steady-state cell concentration, X
X = Yx/s{[S0] - KsD/(meumax - D)..........(2)
Solution:
Yx/s = 0.33 g/g-substrate;
Ks = 12 x 10-3 g/L; [S0] = 10g/L,
puting value in (1)
Dmax = 0.1 * 10 / (12 x 10-3 + 10)
= 0.1/h.
Now it is given that operating D is 1/2 of Dmax, therefore,
D in our case will be = 0.05/h
concentration of protozoa cells from equation (2).
Therefore, X = 0.33*{10 - 12 x 10-3 * 0.05/(0.1 - 0.05)} = 3.3 g/L.
why do trade winds and westerlies behave differently in the northern and southern hemisphere
Answers
Answer: coriolis effect
Explanation: because earth rotates as the air is moving, the winds in the northern hemisphere curve to the right and air in the southern hemisphere curves to the left.
Explain two (each) methods of micro-organism control for Malaria and Rabies
Answers
Explanation:
Vaccination and use of quinine drugs
where does the second step in making a protein occur?
Answers
Answer:
ribosome in the cytoplasm
Explanation:
The second step in making a protein occurs in the ribosome in the cytoplasm.
An organism that survives an epidemic
Answers
Answer:
Genetic Flow is the answer but there is more than one
A major change that occurred in the evolution of eukaryotic cells from prokaryotic cells was the development of?
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Crossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction.
a. True
b. False
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Answer:
T
Explanation:
I Got It Right.
will All mutations become more common in a population.
Answers
Answer:
False
Explanation:
Mutations are changes in the genetic (nucleotide) sequence of the genome of an organism. According to their effects, mutations can be divided into beneficial, neutral and detrimental for the fitness of the organism, i.e., its ability to survive and reproduce in a given environment. Moreover, mutations can also be classified according to the type of cell that suffers the mutation into 1-somatic mutations that occur in somatic cells and are not inherited, and 2-germinal mutations that occur in germinal cells (i.e., gametes) which can pass to the next generation. In regard to the question above, only those mutations that occur in the germline and are beneficial for the organism (in the environment in which it lives) are expected to become more common in a population.
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A sequence of RNA is shown below:
CAA AAU GCG AUC 3
Using the codon chart below, what is the sequence of amino acids that is produced when this RNA is translated?
Choose 1 answer:
(Choice A)
A
Gln - Asn - Ala - Ile
(Choice B)
B
His - Asn - Ala - Met
(Choice C)
C
Gln - Asn - Pro - Tyr
(Choice D)
D
Val - Leu - Arg - Stop
Answers
Answer:
Choice D
Explanation:
When you translate the RNA, you replace C’s with G’s (and vice versa) and A’s with U’s (also vice versa). So, you get GUU UUA CGC UAG. Then you read the codon chart to get your answer. Hope it helps :)
The sequence of the amino acids which is being produced when this RNA is translated is Val - Leu - Arg - Stop. Thus, the correct option is D.
What is a Codon?Codon can be defined as the sequence of three consecutive nucleotides in the nucleic acids such as a DNA or RNA molecule which codes for a specific amino acid. Certain codons are responsible for the signal of the start or end of the translation process.
Codons are universal in nature throughout the different living organisms. There are about 64 different codons which codes for 20 standard amino acids in the cell. There are three stop codons in the genetic code which stop the process of translation of protein molecules including UAG, UAA, and UGA.
The sequence of the amino acids which can be produced when this RNA is translated 5'-CAA AAU GCG AUC-3' will be Val - Leu - Arg - Stop.
Therefore, the correct option is D.
Learn more about Codon here:
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What cell is this ?
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Answer:
Animal cell
Explanation:
The interaction of the skeletal and muscular systems for movement is coordinated by which human body system.
A. Circulatory
B. Excretory
C.Respiratory
D.Nervous
Answers
Answer:
D: Nervous system
Hope this helps!
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The trees in a forest were cut down to make room for a housing development. Explain how this impacts the environment.
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Which type of selection occurs when a population experiences a shift in diversity toward the larger organisms? o stabilizing selection directional selection disruptive selection adaptive selection
Answers
Answer:
Directional selection
Explanation:
This because directional selection is type selection in which a particular phenotype is choosen and favored among several other phenotypes which cause a shift in diversity of larger population of organisms causing the population to shift in over time in a direction towards the choosen phenotype.
Directional selection
The distribution of population elements along a continuum of homogeneity to heterogeneity with respect to one or more variables is characterized as population diversity. Measures are specified using variance-based interpretations that can be applied to qualitative data.When individuals with qualities on one side of the population's mean survive or reproduce more than those on the other, this is known as directional selection.Directional selection occurs when a population experiences a shift in diversity toward the larger organismsFor more information:
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