Biology :asked onmason5579
20.05.2023the following question
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20.05.2023, solved by verified expert
Uracil is found in mRNA but not DNA.
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Biology
Which base is found in rna but not in dna? a.adenine b.cytosine c.thymine d.uracil?
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P Answered by Master 
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Uracil is found in mRNA but not DNA.
Biology
1. which of the following is always single-stranded? a. messenger rna (mrna) b. double-stranded rna (dsrna) c. dna d. dna and rna (obviously its not b.) 2. which of the following is a difference between dna and rna? a. most types of rna are double-stranded b. rna contains lipids c. they have different sugars d. rna has thymine 3. which of the following bases are found in rna but not in dna? a. uracil b. guanine c. adenine d. cytosine i m pretty sure 3 is a. but i want to be sure.
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P Answered by PhD
A - mRNA
C - they have different sugars.
A - uracil
Biology
1. which of the following is always single-stranded? a. messenger rna (mrna) b. double-stranded rna (dsrna) c. dna d. dna and rna (obviously its not b.) 2. which of the following is a difference between dna and rna? a. most types of rna are double-stranded b. rna contains lipids c. they have different sugars d. rna has thymine 3. which of the following bases are found in rna but not in dna? a. uracil b. guanine c. adenine d. cytosine i m pretty sure 3 is a. but i want to be sure.
Step-by-step answer
P Answered by PhD
A - mRNA
C - they have different sugars.
A - uracil
Biology
`there is one base that is not found in dna, but it is found in rna. which one is it? a. uracil b. cytosine c. thymine d. guanine e. adenine
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P Answered by Specialist 5
It is A: Uracil
DNA and RNA is my favorite subject in Biology and Anatomy
Biology
`there is one base that is not found in dna, but it is found in rna. which one is it? a. uracil b. cytosine c. thymine d. guanine e. adenine
Step-by-step answer
P Answered by Master 5
It is A: Uracil
DNA and RNA is my favorite subject in Biology and Anatomy
Biology
In the 18th century, carolus linnaeus classified organisms based on their structural similarities. modern classification determines relationships more accurately because it is based on genetic and other biochemical similarities. this change in classification method best illustrates that (1) multiple trials are required to increase the validity of a scientific explanation (2) scientific explanations are subject to the ethical view of the scientist proposing them (3) peer review is required to validate the results of scientific investigations (4)
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P Answered by Master 8
(4) all scientific explanations are tentative and
subject to change and improvement
Biology
Most eukaryotic cells spend most of their cell cycle in which phase
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P Answered by Specialist 5
Eukayotic cells spend most of their cell cycle in the interphase
Biology
When mendel crossed purebred purple flowering plants (pp) with purebred white flowering plants (pp), what were the flower colors of the resulting offspring? 25 percent white and 75 percent purple 50 percent white and 50 percent purple 100 percent purple 100 percent white
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P Answered by PhD 208
The answer is100 percent purple
Let P be dominant allele for purple flowers and p recessive allele for white flowers. So purebred purple flower has two P alleles and its genotype is PP and purebread white flower has two p alleles and its genotype is pp. Since P is dominant over p, when found together like in heterozygous plants (Pp), the flowers will express dominant allele and will be purple.
So, a cross betweenpurebred purple flowering plants (PP) with purebred white flowering plants (pp) will have 100% of the offspring with genotype Pp and purple flower color.
Parents: PP x pp
Offspring: Pp Pp Pp Pp
Biology
In fruit flies, bar-shaped eyes are dominant to normal-shaped eyes. male offspring from parents that contained only bar-shaped alleles will have bar eyes. if this male (fly#1) is crossed with a normal-eyed female (fly#2) only the female offspring have bar-shaped eyes. if a normal-eyed (fly#3) is crossed with a bar-eyed female (fly#4), whose parents contained only bar-shaped alleles, all their offspring will have bar-shaped eyes. explain this results and give the phenotypes of the numbered flies in this problem.
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P Answered by PhD
The answer is
fly #1: Genotype: XBY, phenotype: male with bar-shaped eyes
fly #2: Genotype: XbXb, phenotype: female with normal-shaped eyes
fly #3: Genotype: XBY, phenotype: male with bar-shaped eyes
fly #4: Genotype: XBXB, phenotype: female with bar-shaped eyes
Since there is difference in inheritance, bar-shaped eyes must be X-linked dominant trait.
XB - dominant allele on X chromosomefor bar-shaped eyes
Xb - recessive allele on X chromosomefor normal-shaped eyes.
Let's see:
Male offspring from parents that contained only bar-shaped alleles will have bar eyes:
Father Mother
Parents: XBY x XBXB
Male offspring: XBY
fly#1: XBY
Fly#1 is crossed with a normal-eyed female (fly#2) only the female offspring have bar-shaped eyes:
Father Mother
Parents: XBY x XbXb
Female offspring: XBXb
fly#2: XbXb
If a normal-eyed (fly#3) is crossed with a bar-eyed female (fly#4), whose parents contained only bar-shaped alleles, all their offspring will have bar-shaped eyes.:
Father Mother
Parents: XbY x XBXB (since her parents were: XBY and XBXB)
Offspring: XBXb XBXb XBY XBY
Biology
The allele for an attached earlobe is recessive. in the third generation, what are the odds that a carrier father and homozygous dominant mother will have a child with an attached earlobe? a. 0 % b. 25 % c. 50 % d. 100 %
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P Answered by Specialist 2
The correct answer would be A. 0%
Let A and a be the dominant and recessive allele of the gene responsible for the attachment of earlobes respectively.
The father is a carrier of the trait. Thus, the genotype of the father would be Aa.
Similarly, the mother is homozygous dominant due to which her genotype would be AA.
The cross would produce the offspring with two types of genotypes which are Aa and AA.
Thus, none of the offspring would have attached earlobes as it is recessive trait.
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