Questions
Describe the shape of a viral particle?

Describe the shape of a viral particle?

In: Biology

What is cystic fibrosis? Describe the major genetic cause and the mechanism that leads to the...

What is cystic fibrosis? Describe the major genetic cause and the mechanism that leads to the
symptoms of the disease.

In: Biology

Why are DNA proofreading enzymes necessary? A DNA molecule can be thought of as having 2...

Why are DNA proofreading enzymes necessary? A DNA molecule can be thought of as having 2 components, corresponding to the sides and rungs of a ladder. What are these 2 components? What class of molecule is telomerase? What does telomerase do? In which human cells is telomerase appropriately active? In what kinds of cells is telomerase inappropriately active?

In: Biology

The maximum yield of ATP per molecule of glucose in eukaryotic cells is 36 or 38...

The maximum yield of ATP per molecule of glucose in eukaryotic cells is 36 or 38 ATP, depending on cell type and conditions. Why is the calculated ATP yield referred to as "Maximal Theoretical Yield" in eukaryotic and in prokaryotic cells?

In: Biology

1. How would it affect organisms living in cold climates if oil or alcohol were their...

1. How would it affect organisms living in cold climates if oil or alcohol were their main body fluid?
2. How do you think the cohesive nature of water relates to its evaporation?
3. Describe in detail an experiment you could conduct to test whether another substance could replace water.

In: Biology

Describe how you would identify genes responsible for transcription in E. coli by isolating mutations in...

Describe how you would identify genes responsible for transcription in E. coli by isolating mutations in their genes. Remember that these genes are required for cell viability. Include all the steps in the isolation of the mutants and also describe how you will differentiate the mutants you want from those in other genes necessary for viability. This includes giving me the expected result for mutants in the genes you want.

In: Biology

The average sperm count in males is now lower than it was several decades ago. The...

The average sperm count in males is now lower than it was several decades ago. The reasons for lower sperm counts observed in males today is not known. Propose a hypothesis as to why, global, sperm counts are lower today than then were fifty years ago. What experiment could you do to test your hypothesis?

In: Biology

what is the function of HSPGs in the stem cell niche in your own words

what is the function of HSPGs in the stem cell niche in your own words

In: Biology

You are studying a bacterium that grows in a particular ecological niche. You cannot culture it...

You are studying a bacterium that grows in a particular ecological niche. You cannot culture it in the laboratory, but you can isolate small quantities of cells that microscopic analysis indicates are not contaminated with other bacteria. How will you obtain the ribosomal RNA gene sequence data to study the taxonomy of the bacterium? •How will you determine the complete genome sequence of the bacterium?

The steps performed for determining the complete genomics sequence of the bacterium include- Step 1: Cloning Step 2: Restriction Mapping Step 3: Gel Electrophoresis Step 4: DNA Sequence Analysis

Gel electrophoresis- The DNA fragments after Restriction digestion are separated by electrophoresis, a process that involves application of an electric field to cause the DNA fragments to migrate into an agarose gel. The gel is then stained with a methylene blue stain to visualize the DNA bands and may be photographed. Although methylene blue dye is not as sensitive as ethidium bromide it may be used to stain the higher quantities of DNA that are used in this experiment. The movement of the fragments will always be towards the positive electrode because DNA is a negatively charged molecule. The fragments move through the gel at a rate that is determined by their size and shape, with the smallest moving the fastest.

DNA Sequence Analysis- This method uses dideoxynucleotide triphosphates(ddNTPs) whichwhich an H on the 3’ carbon of the ribose sugar instead of the normal OH found in deoxynucleotide triphosphates (dNTPs). Dideoxynucleotides are chain terminators. In a synthesis reaction, if a dideoxynucleotide is added instead of the normal deoxynucleotide, the synthesis stops at that point because the 3’OH necessary for thetaddition of the next nucleotide is absent. The sequencing gel is able to resolve fragments that differ in size from each other by only one base.

**I need explain exactly gel ectrphoresis and DNA sequence analysis will help find the bacteria genome

In: Biology

Explain in detail type I and III hypersensitivity

Explain in detail type I and III hypersensitivity

In: Biology

what is one way the Corona virus pandemic will end?  Explain using these topics: what is a...

what is one way the Corona virus pandemic will end?  Explain using these topics: what is a virus, vaccination, social distancing, SIR model of how diseases spread, mutation

In: Biology

If DNA from an evidence sample and DNA from a suspect or victim share a profile...

If DNA from an evidence sample and DNA from a suspect or victim share a profile that has a low frequency in the population, this suggests that the two DNA samples came from the same person; the lower the frequency, the stronger the evidence. But the possibility remains that the match is only apparent—that an error has occurred and the true profile of one of the sources differs from that reported by the laboratory. Please discuss the ways that laboratory errors, particularly errors that might falsely incriminate a suspect, can arise, how their occurrence might be minimized, and how to take into account the fact that the error rate can never be reduced to zero.

Please discuss the quality assurance and control.

In: Biology

Explain/Breakdown the Chemotaxis response mechanism and their role in flagella movement and regulation. Bacterial Motility(Motor) Kit...

Explain/Breakdown the Chemotaxis response mechanism and their role in flagella movement and regulation. Bacterial Motility(Motor) Kit Please provide an in depth answer in its simplest form for easy understanding. Thank you

In: Biology

Design a microscopy experiment (widefield) testing the effect of Vertiporfin on cell death (step by step)....

Design a microscopy experiment (widefield) testing the effect of Vertiporfin on cell death (step by step). What do we look for? which colour are we running, how long are we running it for?

Note: don't worry about the microscope, just design an experiment for staining of cells so it can be looked under widefield microscope

In: Biology

19. Pick the correct answer. When a gene of interest has been inserted into a plasmid...

19. Pick the correct answer.

When a gene of interest has been inserted into a plasmid vector, the result is called _____ DNA.

homologous

analogous
recombinant
heterologous
restriction fragment
Restriction sites are often DNA _____, which means that both DNA strands constituting the restriction site have the same DNA sequence but in _____ orientation.
donors; parallel
palindromes; parallel
palindromes; antiparallel
vectors; antiparallel
hybrids; parallel

The restriction enzyme XYZ-1 cuts DNA in one strand of a double-stranded DNA molecule at the palindromic sequence 5′-GAATTC-3′. What is the sequence of the opposite strand also cleaved by this restriction enzyme?

3′-GAATTC-5′
3′-CTTAAG-5′
3′-GTTAAC-5′
3′-CAATTG-5′
3′-GAAAAG-5′
Name the key function of mitosis.
to replicate DNA within a cell
to generate two daughter cells genetically identical to the parent cell
to generate two daughter cells that through recombination are genetically similar to (but not identical) to the parent cell
to manufacture protein
to condense the DNA
Name two key functions of meiosis.
double the DNA content per cell in the production of gametes and properly segregate the chromosomes into each of the four sperm or egg cells formed per parent cell
halve the DNA content per cell in the production of gametes and properly segregate the chromosomes into each of the four sperm or egg cells formed per parent cell
halve the DNA content per cell in the production of somatic cells and properly segregate the chromosomes into each of the two daughter cells formed per parent cell
halve the RNA content per cell in the production of gametes and permit crossing over to occur
double the DNA content per cell in the production of gametes and permit crossing over to occur
In an attempt to simplify meiosis for the benefit of students, mad scientists develop a way of preventing premeiotic S phase and making do with having just one division, including pairing, crossing over, and segregation. Would the products of such a system differ from those of typical meiosis? Why?
The products would be identical to typical meiosis.
It would not work because the DNA needs to replicate in order for meiosis to function properly.
Such a system would generate two cells instead of four.
Such a system would not be able to provide genetically diverse gametes.
Human cells normally have 46 chromosomes. Let us define the transition from one cell to two cells as mitosis proceeds. What is the number of nuclear DNA molecules present in a human cell in metaphase of mitosis?
92 DNA molecules per cell. Found as 92 physically separate chromosomes.
92 DNA molecules per cell. Found as 46 chromosomes each with two chromatids attached at the centromere.
46 DNA molecules per cell. Found as 23 chromosomes, each with two chromatids attached at the centromere.
23 DNA molecules per cell. Found as 23 chromosomes in each of two nuclei.

23 DNA molecules per cell or a haploid genetic composition.

Four of the following events are part of both meiosis and mitosis, but only one is meiotic. Which one?
chromatid formation
chromosome movement to poles
chromosome condensation
synapsis
spindle formation
Human cells normally have 46 chromosomes. Let us define the transition from one cell to two cells as meiosis I proceeds. What is the number of nuclear DNA molecules present in the human cells formed at the completion of meiosis I?
46 DNA molecules per cell. Found as 46 physically separate chromosomes in each new cell.
92 DNA molecules per cell. Found as 46 chromosomes each with two chromatids attached at the centromere.
46 DNA molecules per cell. Found as 23 chromosomes, each with two chromatids attached at the centromere.
23 DNA molecules per cell. Found as 23 chromosomes in each newly formed cell.
The newly formed cells will have variable numbers of chromosomes due to genetic recombination.

In: Biology