07/30/25

What is the primary difference between Gram-positive and Gram-negative bacteria?
The primary difference lies in their cell wall structure. Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet stain, appearing purple under a microscope.... more
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07/28/25

How to identify the limiting reactant?
I'm studying chemical reactions involving multiple reactants, and I'm having trouble determining the limiting reactant. For example, if there's a mixture of H₂SO₄ and NaOH reacting together in an... more
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11/09/22

chemistry question
Weight (In Grams) of Aspirin: 3.0143(i) Calculate the Theoretical moles of Aspirin (MUST identify which one is the limiting reagent)
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08/15/22

How to extract coefficients corresponding to data from each time in a mixed effect model in R?
I am not good at statistics and might have a naive question. Any help is appreciated.Here is the simplified question: Patients received two different vaccines twice and we collected their blood... more
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08/14/22

If standard deviation was 10 what is the sample size?
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04/22/22

What percent of repeated independent simple random samples (SRS) of the given sizes will have prevalence differences that fall in the range of -0.02 to 0.02? P1=p2=.25
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03/01/22

Which statistical analysis to use?
I am comparing the number of positive screens and the number of negative screens to see if there is a significant difference. If there is a significant number of positive screens, then the anxiety... more
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02/06/22

Independent random samples of professional football and basketball players gave the following information. Assume that the weight distributions are mound-shaped and symmetric.
Weights (in lb) of pro football players: x1; n1 = 21 245 263 255 251 244 276 240 265 257 252 282 256 250 264 270 275 245 275 253 265 272 Weights (in lb) of pro basketball players: x2; n2 =... more
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02/06/22

Statistics Question
The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal... more
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10/26/20

The following results are obtained from a broth dilution test for microbial susceptibility of a bacterial infection in a patient: Antibiotic Growth in culture + drug Transfer to drug-free

Antibiotic Growth in culture + drug Transfer to drug-free culture concentration50 μg/ml No growth No growth25 μg/ml No growth , Growth 12.5 μg/ml No growth , Growth6.25 μg/ml Growth , Growth What... more
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10/31/19

From this study, what is the value of the point estimate for the mean core body temperature in adults?
A total of 130 adults were recruited to determine the normal core body temperature range of healthy adults in the U.S. The study reported the 95% CI for the mean core body temperature in adults to... more
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10/25/19

lab report questions

Question 7: summarise the results of your phagocytosis assay, comparing the differences, if any, between what you observe for cells with beads A and cells with beads B.beads A x10 objective:beads A... more
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07/18/19

Fermentation to acetic acid?
How much time is needed for the fermentation to acetic acid production cycle, and the conversion of apple vinegar in a sealed container incubated at 37 °C? Should be in the fully... more
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06/01/19

In biostatistics, what is the difference between random distribution and normal distribution?
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05/28/19

What are the advantages and disadvantages of using beta-galactosidase compared to luciferase as a reporter gene?
In the University labs, we have used Beta-galactosidase as a reporter gene to quantify the expression initiated by the stress-response promoter in yeast. This was done by exposing one of the two... more
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05/24/19

How is the exogenous DNA protected from degradation during bacterial transformation?
During transformation, a bacterium can take up DNA from its environment. A small fraction of bacterial species are known to be naturally competent, meaning that they can engage in this sort of... more
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04/13/19

Why don't all bacteria have F-plasmids by now?
Some bacteria can undergo gene transfer by conjugation. Conjugation is a form of horizontal gene transfer, meaning from one (unrelated) bacterium to another (in contrast to vertical gene transfer,... more
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03/26/19

PSI-BLAST website algorithm parameters?
http://blast.ncbi.nlm.nih.gov/Blast.cgiIn this website, when I want to apply the psi-blast algorithm on a sequence, under the section of algorithm parameters , what does PSI-BLAST threshold mean?... more
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05/22/18

a farmer built a fence
a farmer built a fence 1.5m high and attached the top to of the fence to a tree. the tree was 7m tall. after 10 years, the tree had grown to a height of 14m. how high is the fence? Explain your... more
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03/10/18

what is the specific function of the protein that controls stem legnth from mendels gene (Le)?
 Mendel's stem length gene(Le) encodes a gibberellin 3B-Hydroxlases
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03/05/18

"In a population plants, 76 percent posses at least one recessive allele. What is the excepted percentage of plants that have a recessive trait?"
Hey, Im a 10th grade student in highschool and I am having difficulty understanding a problem from my "Hardy Weinberg Equation" worksheet. The problem is as follows: "In a population plants, 76... more
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03/01/18

How many CFU/ml did you have in the original sample ?
You count 150 bacteria colonies on a petri dish. How many CFU/ml did you have in the original sample if you created the plate with 100 ul of a 1:10000 dilution?
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03/01/18

what part of a bacterial cell is used to make recombinant dna
it is only home work that i just don't understand very well
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01/30/18

It won't let me put 1200 characters so description is best.
A kennel owner has a magnificent irish setter, which he wants to hire out for stud. He knows that one of its ancestors was Erin-Go-Bragh, who carried a recessive allele for atrophy of the retina.... more
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01/22/18

Are genes that code for β-lactamases, also known as penicillinase passed by vertical or horizontal transfer?
These enzymes are produced by E. coli with resistance to penicillins
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