Can someone plss help me
With the DNA Unit test unit 6 I literally have a 63 in biology any help would be great
Can't help with answers, if the questions are not posted.
A) What would be the result of a cytosine base being substituted for a thymine base in a DNA segment during DNA replication? (1 point)
The sequence could code for the wrong amino acid during translation.
The cytosine base would pair with adenine when the DNA was replicated.
There would be no effect on the DNA.
The entire segment of DNA would be affected.
A) Which statement is the first step of protein synthesis? (1 point)
DNA unzips between the base pairs.
tRNA carries amino acids to the ribosome and attaches them to the mRNA
strand.
A ribosome attaches to the mRNA.
Amino acids are linked together with peptide bonds.
A) Which statement is true? (1 point)
The human body uses 20 amino acids to form all types of proteins.
Amino acids do not need to be assembled in a particular order.
tRNA is attached to specific proteins in the cell’s cytoplasm.
Amino acids form a polypeptide chain via carbon-carbon bonds.
A) Which statement about cystic fibrosis is true? (1 point)
Carriers have an advantage over people who do not have the cystic fibrosis mutation.
Cystic fibrosis is caused by a mutation in which a dominant allele replaces a recessive allele.
Cystic fibrosis is caused by a deletion of one codon in the DNA molecule.
Cystic fibrosis affects a person’s ability to make normal red blood cells
A) What benefit does using the CRISPR technique have in creating GMOs? (1 point)
It eliminates all risk of mutation.
CRISPR can result in infertile hybrids.
Precise traits can be chosen to produce viable organisms more quickly.
Diversity within species can continue to increase through crossbreeding.
A) What is the phenotype of a mouse that has the genotype Bb where B is the gene for black furand b is the gene for brown fur assuming this gene follows a Mendelian inheritance pattern?
(1 point)
fur with brown hairs
fur with black hairs
fur with yellow hairs
fur with both black and brown hairs
A) A tall, heterozygous pea plant is crossed with another tall, heterozygous pea plant. What is the probability that an offspring will be a short plant? (1 point)
75%
25%
0%
50%
A) Which of the following mutations would be most likely to have a harmful effect on an organism?(1 point)
all mutations have a harmful effect on organisms
there is not enough information to know whether a mutation would be harmful
a substitution of a thymine for an adenine
a deletion of 3 bases near the center of a gene
A) Which statement best describes why Punnett squares are useful? (1 point)
Punnett squares are used to predict how dominant alleles are inherited.
Punnett squares are used to predict all possible allele combinations and their frequencies in offspring.
Punnett squares are used to predict the most likely allele combinations of the parents in a cross.
Punnett squares are used to predict how recessive alleles are inherited.
A) How are new viruses made? (1 point)
asexual reproduction
viral DNA or RNA copied by a host cell
sexual reproduction
viral DNA or RNA copied by viral cells
A) Compare and contrast a provirus and viral DNA. (1 point)
A provirus is the host cell’s DNA that has been destroyed.
A provirus is viral DNA incorporated into the host cell’s DNA.
A provirus is bacterial DNA incorporated into the viral DNA.
A provirus is newly replicated viral DNA after injection.
A) Why is the common cold virus difficult to cure in humans? (1 point)
It possesses a viral genome that mutates very quickly.
It is caused by a special type of virus called a retrovirus.
It attacks white blood cells that fight off foreign bodies.
It is a spherical-shaped virus with many protein receptors.
A) What function makes the HIV virus unique? (1 point)
It copies the information for reproduction from RNA back into DNA.
It attacks and destroys red blood cells in the bodies of its host organisms.
It attacks neurons in the nervous system and causes paralysis.
It has viral DNA that is transmitted through indirect contact with infected persons
A) Compare and contrast the traits of viruses and bacteria. Is a virus considered a living thing? Explain your answer in 3–5 sentences. (4 points)
A) Hemophilia is a hereditary bleeding disorder that primarily affects males. In 3–5 sentences,summarize why this condition typically affects males more than females. (4 points)
A) The lactose (lac) operon in E. coli is an example of a gene that is repressed when lactose is not available in a cell. In 3-5 sentences, explain what this means, using correct terminology.(4 points)
A) Homozygous tall pea plants look the same as heterozygous tall pea plants. Formulate a pollination experiment to identify whether a tall pea plant is homozygous or heterozygous. Explain your answer in 3-5 sentences. (4 points)
A) In 3–5 sentences, explain how genetic modification helps provide food for a growing population. (4 points)
these are the questions i have for the connexus bio test
What would be the result of a cytosine base being substituted for a thymine base in a DNA segment during DNA replication?
The diagram below represents the chromosome pairs present in the body cells of a fruit fly. Fruit flies reproduce sexually. Exactly how many chromosomes does a fruit fly offspring normally inherit from each parent? *
2 points
Captionless Image
2 chromosomes
8 chromosomes
4 chromosomes
1 chromosome
A DNA sequence is shown: TAGCATGAG. What is produced when the sequence is transcribed? *
2 points
a section of mRNA with the base sequence AUCCUCGUA
a section of mRNA with the base sequence AUCGUACUC
a section of DNA with the base sequence ATCCTCGTA
a section of DNA with the base sequence ATCGTACTC
Which statement is the first step of protein synthesis? *
2 points
A new DNA strand is made.
tRNA carries amino acids to the ribosome and attaches it to the mRNA strand.
A ribosome attaches to the mRNA.
DNA unzips between the base pairs.
In turkeys, the allele for brown feather is dominant to the allele for yellow feather. If two heterozygous turkeys mate and produce offspring, what is the probability of an individual offspring having yellow feather? *
2 points
100%
25%
0
50%
Which of the following statements best compares reproduction in viruses with reproduction in single-celled protists? *
2 points
Viruses require large colonies to reproduce; single-celled protists reproduce as individual cells.
Viruses require the cellular machinery of host cells to reproduce; single-celled protists reproduce on their own.
Viruses reproduce by releasing spores; single-celled protists reproduce by dividing in half.
Viruses form haploid gametes when they reproduce; single-celled protists form diploid gametes when they reproduce.
A tall, heterozygous pea plant is cross-pollinated with another tall, homozygous pea plant. What is the probability that the offspring will be a short plant? *
2 points
75%
50%
0%
25%
A simple diagram of a DNA molecule is shown below. Identify the components in the red circle. *
2 points
Captionless Image
a nucleotide base pair
a ribosome binding site
an amino acid
sugar phosphate backbone
A particular species of potatoes can have red or yellow skin color. The skin color is controlled by a single gene with two alleles, the red allele and the yellow allele. When potatoes are homozygous for red skin color are crossed with potatoes that are homozygous for yellow skin color, 100% of the offspring have red skin color. Based on this information, how do the alleles for skin color interact? *
2 points
The red allele is recessive to the yellow allele.
The red allele is dominant to the yellow allele.
The red allele and the yellow allele are codominant.
The red allele and the yellow allele are incompletely dominant.
The diagram below represents structures and processes involved in protein synthesis in an animal cell. Four parts of the diagram are labeled W, X, Y, and Z. Which part of the diagram represents translation? *
2 points
Captionless Image
Part X
Part Z
Part Y
Part W
According to Chargaff's base pairing rule: In DNA, the percentage of *
2 points
adenine molecules in DNA is much greater than the percentage of thymine molecules.
thymine molecules in DNA is about equal to the percentage of adenine molecules
adenine molecules in DNA is about equal to the percentage of guanine molecules.
cytosine molecules in DNA is much greater than the percentage of guanine molecules.
_______are part of a chromosome that control a trait, such as eye color. ______ are different forms of genes, such as blue or green eyes. *
2 points
allele, gene
gene, allele
trait, allele
allele, trait
In the Punnett square shown in Figure below, which of the following is true about the offspring resulting from the cross? *
2 points
Captionless Image
About three fourths will to be tall.
About half will be short.
All will be tall.
All will be short.
True or False? A heterozygous individual that exhibits the traits of both parents is an example of codominance. *
1 point
True
False
Match the correct choices *
4 points
The presence of two identical alleles at a particular gene location What is expressed physically. The presence of two different alleles at a particular gene location Genetic makeup of the organism
Phenotype
Heterozygous
Homozygous
Genotype
Phenotype
Heterozygous
Homozygous
Genotype
A short mRNA sequence is shown in the box below. Determine the DNA sequence from which this mRNA sequence was transcribed. The first three are TAC, complete the remainder. *
1 point
Captionless Image
Using the information in the table below, determine the amino acid sequence that is coded for by the mRNA sequence: AUG -UCU-GAU-UGG-UAC *
1 point
Captionless Image
What is the start codon? What are the 3 stop codons? *
2 points
DNA is ___________ stranded while RNA is ___________stranded. *
1 point
double, single
single, double
triple, single
single, triple
These are my question on connexus
1.What would happen if a C was substituted for a T in a DNA segment during DNA replication
2. What is the first step in protein synthesis
3.In mice, Black fur is dominant (B) and brown fur is recessive (b). What is the phenotype of a mouse that has the genotype Bb (assuming normal inheritance patterns)?
Im doing the alternative test can anyone help with answers for that??
Use the image below for questions 1, 2, and 3
1. Which arrow represents the process of transcription? *
1 point
A
B
C
2. Which arrow represents the process of translation? *
1 point
A
B
C
3. Why do living things need the process represented by the A arrow? Why shouldn't proteins be made straight from the DNA? Explain in your own words. *
3 points
4. Transcription takes place inside the nucleus of a cell *
1 point
True
False
5. Translation takes place inside the nucleus of a cell *
1 point
True
False