Questions
2.) Discuss in detail why masks are relatively ineffective as a means of preventing infection by...

2.) Discuss in detail why masks are relatively ineffective as a means of preventing infection by coronavirus, especially in regards to cloth masks; also discuss when, where and who masks appropriate and recommended for.

3.) What Percentage of alcohol, bleach, and Hydrogen peroxide are effective at eliminating Coronavirus 19.

4.) Despite having a similar profile to SARS, Covid-19 is already more widespread with much larger morbidity and mortality totals. What factors do you think accounted for the disparity of these 2 outbreaks

5.) MERS is also a coronavirus; however, it is classified as an endemic (localized) illness and has never caused an outbreak. Why is this?

In: Biology

Explain and demonstrate how a dihybrid test cross can be used to determine if autosomal linkage...

Explain and demonstrate how a dihybrid test cross can be used to determine if autosomal linkage exists.

In: Biology

for paper whitening process: 1. Outline the biochemical pathway that occurs in the industrial paper whitening...

for paper whitening process:

1. Outline the biochemical pathway that occurs in the industrial paper whitening process
2. Which enzymes participate in the selected industrial process
3. Classify enzymes according to their activity
4. Establish optimal pH and temperature conditions for the functioning of these enzymes
5. Consult factors that inhibit the activity of the enzymes that participate in the selected industrial process

In: Biology

Sexual dimorphism occurs when males are distinctly different from females in traits other than reproductive organs....

Sexual dimorphism occurs when males are distinctly different from females in traits other than reproductive organs. In many species, there is no dimorphism and males resemble females in most traits. If the two sexes appear phenotypically identical, in a short essay (100-150 words), explain what you might conclude (at least tentatively) about their reproductive behaviors.

In: Biology

Description of biochemical tests for gram positive cocci chart micrococcus luteus micrococcus roseus staphlyococcus aureus staphlyococcus...

Description of biochemical tests for gram positive cocci chart

micrococcus luteus

micrococcus roseus

staphlyococcus aureus

staphlyococcus epidermidis

streptococcus faecalis

streptococcus thermophilus

streptococcus pneumoniae

In: Biology

1. Explain why the earliest evidence of animals in fhe fossil record would come from chemicals...

1. Explain why the earliest evidence of animals in fhe fossil record would come from chemicals as opposed to fossilized imprints.

2. Describe why creating an accurate phylogeny of animal groups (porifera, cnidaria, ctenophora, bilateria and placozoa) is a challenge for taxonomists.

In: Biology

1. In general, why is it really wet in Eureka, CA and quite dry in San...

1. In general, why is it really wet in Eureka, CA and quite dry in San Diego, CA?
2. How would you measure net primary production in a bean plant?
3. Is the length of daylight in Bakersfield today different from that at the North Pole? Explain

In: Biology

1. Explain three important embryonic components that result from gastrulation, including why they are important in...

1. Explain three important embryonic components that result from gastrulation, including why they are important in bilaterian animals.

2. Describe the basic difference between protostomes and deuterostomes. In which group would humans belong? In which group would you expect to see identical twins, and why?

3.Explain why the notochord is especially important during the embryonic development of chordates.

4.Molecular evidence suggests that hagfish and lamprey should form sister taxa. Explain why many phylogenies suggest that lamprey branched off after hagfish, and would thus be more closely related to jawed vertebrates.

5.Explain why it may have been important for hagfish to have lost their backbone.

6.Explain why the life cycle of lamprey is said to be anadromous. In which part of their life cycle are they parasites?

In: Biology

Human fragile sites are associated with _____. chromosome breakage replication late in S phase stalling of...

Human fragile sites are associated with _____.

chromosome breakage

replication late in S phase

stalling of DNA replication enzymes

genetic disorders in certain instances

All of the above

In: Biology

To achieve proper cell and tissue growth, a tissue-engineered product must accommodate blood flow similar to...

To achieve proper cell and tissue growth, a tissue-engineered product must accommodate blood flow similar to that of the native tissue. Without blood flow to deliver oxygen, glucose, and other essential nutrients while removing waste materials, the size of the implant is limited. A company develops a porous bone graft which permits glucose to flow into the interior. A 50 g/min buffer solution containing 5 mg/mL of glucose flows into the bone graft.

Solve in MatLab and MathCAD

(a) What is the expected total mass flow rate and mass flow rate of glucose out of the system?

(b) Determine the total mass of glucose to flow through the bone graft in a 24 hour period.

(c) Laboratory results show the total outlet mass flow rate is 50 g/min. The outlet glucose mass flow rate is 225 mg/min. Make conjectures about what has happened in this experiment.

In: Biology

2. Two normal parents have a son that is a carrier for hemophilia (an X-linked recessive...

2. Two normal parents have a son that is a carrier for hemophilia (an X-linked recessive disorder) and has Kleinfelter Syndrome.


a. Write out the cross as described above illustrating the genotypes and phenotypes of the parents and child.


b. Did the non-disjunction event occur in 1) mother, 2) father, or 3) could have occurred in either of the two parents?


c. Did the nondisjunction event occur in 1) Meiosis I, 2) Meiosis II, or 3) could have occurred in either Division during Meiosis.

In: Biology

Acetylcholinesterase catalyzes the hydrolysis of the neurotransmitter acetylcholine: Acetylcholine + H2O  acetate + choline The...

Acetylcholinesterase catalyzes the hydrolysis of the neurotransmitter acetylcholine: Acetylcholine + H2O  acetate + choline The Km of acetylcholinesterase for its substrate acetylcholine is 9.5x10-5M. In a reaction mixture containing 5 nanomoles/mL of acetylcholinesterase and 150μM acetylcholine, a velocity vo=40μmol/mLsec was observed for the acetylcholinesterase reaction.

a. Calculate Vmax for this amount of enzyme

b. Calculate kcat for acetylcholinesterase

c. Calculate the catalytic efficiency (kcat/Km) for acetylcholinesterase

d. Does acetylcholinesterase approach catalytic perfection?

e. What determines the ultimate speed limit of an enzyme-catalyzed reaction? That is, what is it that imposes the physical limit on catalytic perfection?

In: Biology

Examine the DNA sequence shown below. How many possible reading frames does this piece of DNA...

  1. Examine the DNA sequence shown below. How many possible reading frames does this piece of DNA have? Explain where they are. Which one can be used and how do you know?

5'-AGTCGA TCGAACGGTCA TCG-3' 3'-TCAGCTAGCTTGCCAGTAGC-5'

  1. What feature of eukaryotes makes annotation more difficult?

  2. Describe the process whereby DNA is transferred from Agrobacterium to plants.

In: Biology

It can be argued that almost all diseases have, at their root, a cellular basis. This...

It can be argued that almost all diseases have, at their root, a cellular basis. This means we can typically trace every genetic or acquired condition to a problem in a specific type of cell. Is it possible, however, that these diseases/conditions/traits can actually be traced as far as the organelle level? Explore this possibility.

In: Biology

Considerable effort has been directed toward determining the genes in which sequence variation contributes to the...

Considerable effort has been directed toward determining the genes in which sequence variation contributes to the development of type 2 diabetes, a disease that results from a loss of sensitivity of cells to insulin. Approximately 800 genes have been implicated. Explain the significance of the observation.

In: Biology