Introductory Courses

Growth in MSA agar with 0.8% sodium chloride.

Growth in MSA agar with 0.8% sodium chloride.

MSA agar with 0.8% sodium cholride; what would the growths of E.coli, S. aureus, and P. aeruginosa be versus 7.5% sodium chloride.

madscientist11   738   N/A

madscientist11

Lactose vs other solutions in osmosis - why difference

Lactose vs other solutions in osmosis - why difference

In my lab I found that potatoes soaked in lactose had a positive growth in mass, while the other solutions (sucrose, glucose, fructose and maltose) had a negative growth. Any suggestions?
Mol mass was calculated correctly with the same amount of

anneheey98   1033   1 Reply

habiba

A thesis statement of hellen keller

A thesis statement of hellen keller

guys, i want a thesis statement about Hellen Keller please.  I got one which is condfident, but cannot find others

HKMO   1841   5 Replies

biochicka

Amino acids, enzymes, proteins

Amino acids, enzymes, proteins

Does anyone know of a good video I can watch on the synthesis of non essential amino acids. I'm unsure of how exactly the chemical reaction of decarboxylation and deanimation works? i have a test tomorrow and have worked al week trying to figure

labtechwendy   753   1 Reply

bio_man

Estimating how many cells there are, only knowing one slide

Estimating how many cells there are, only knowing one slide

Hello. This is my first post on the forum, I hope I'm posting in the right place.

I have a problem related with cell biology that certainly is very common in practice: estimate how many cells there are inside something only have some

yemino   2239   3 Replies

bio_man

Is the mesophile rod shaped or cocci?

Is the mesophile rod shaped or cocci?

hi, does any body know the yogurt production experiment in microbiology lab question:
is the mesophile rod shaped or cocci?
what shape is the thermophile?

fatimadd   1742   1 Reply

bio_man

How to memorize every muscle in the body?

How to memorize every muscle in the body?

I'm taking this course and its extremely way too much to soak in,, such a short period of time. Memorizing ever muscle in the body this week. ANY suggestions welcome. Any documents to share? im sure I failed the skeletal lab. please help

candy451   3363   6 Replies

TeslaBrain

What would happen to an ecosystem if the decomposers disappeared?

What would happen to an ecosystem if the decomposers disappeared?

What would happen to an ecosystem if the decomposers disappeared?

mizberries   27972   5 Replies

Eloo

Can anyone help me with my Lab 2. I got my data numbers, unable to get average%

Can anyone help me with my Lab 2. I got my data numbers, unable to get average%

Table 1:  Record your data for the number of cells in each stage of the cell cycle observed in normal tissues.

Tissue Type   # Cells in Interphase   # Cells in Prophase   # Cells in
Metaphase   # Cells in Anaphase   # Cells in
Telopha

mm231974   3833   1 Reply

bio_man

Has to do with higher concentration of colistin and nalidixic acid

Has to do with higher concentration of colistin and nalidixic acid

Earlier formulation of Columbia CNA agar using higher concentration of colistin and nalidixic but reduce to improve the recovery of gram positive organisms.  Why would higher concentrations be less effective at allowing growth of gram positive o

gardenlife1   5911   3 Replies

gardenlife1

What is the value of a hanging-drop preparation?

What is the value of a hanging-drop preparation?

What is the value of a hanging-drop preparation

pwaterhouse   2979   1 Reply

padre

If you wanted water to flow out of a tubing piece filled with a 50% solution,

If you wanted water to flow out of a tubing piece filled with a 50% solution,

answer

eddy kenzo   6521   2 Replies

habiba

In the Keystone predator lab which predator promoted its own existance? How

In the Keystone predator lab which predator promoted its own existance? How

I know the keystone predator is the starfish but there is another question that asks which is the top predator?

frogs1986   3513   1 Reply

bio_man

Questions on hemocytometer use in lab?

Questions on hemocytometer use in lab?

Hey everyone, i just had a few general questions about the hemocytometer.
1. How can you use the hemocytometer to estimate the size of organisms?
2.How can you estimate the average size of organisms? ( for example, the average size of an or

Fightboy   2642   2 Replies

Fightboy

Can you help me identify this mystery slide?

Can you help me identify this mystery slide?

The picture I have attached is a cell phone pic of a random bacteria slide I looked at in my 200's level micro class yesterday. It was the first day, so I don't really have the expertise to say what it is, but I am really curious. Our profe

dropkickkid   1336   5 Replies

bio_man

How can I measure the effect of electricity on yeast growth by using my method:

How can I measure the effect of electricity on yeast growth by using my method:

About a week ago I began a school project in biology, where I was given the freedom to choose my own topic for experimentation. I wanted to test the effect of electricity on the growth of yeast cells. Im using optical density to measure the change in

vsrujan   1981   13 Replies

bio_man

state the optimum ph for sucrase activity and describe how sucrase activiy chang

state the optimum ph for sucrase activity and describe how sucrase activiy chang

State the optimumph for sucrase activith and describe how sucrase activity changes at more acidic and more alkaline ph value

jolisah   2151   1 Reply

bio_man

Making a solution

Making a solution

Hello, i need some help on part b of this question I dont know how to approach it.

The following scenario will be used to answer the following questions.

You are working in a lab and are asked to make a 2% agarose gel in

crooked_horizon   1885   1 Reply

ortho2122

Suppose you used 3 microliters of pGLO?

Suppose you used 3 microliters of pGLO?

Suppose you used 3 microliters of pGLO (0.03 microgram per microliter), and spread 250 microliters of a total reaction volume of 500 microliters.  If you count 100 transformed colonies, what is your transformation efficiency (TE)?

Fr

helloducky   2675   1 Reply

ortho2122

how can I calculate specific absorbance?

how can I calculate specific absorbance?

Hi guys!
I've got a problem. I'm not sure how to calculate specific absorbance.
 My data:
-Absorbance 1
-Absorbance2
-Protein concentration
-Nacl
-Standard protein

kondzia   1339   1 Reply

habiba

why does the blank have an absorbance reading above zero? Bradford protein assa

why does the blank have an absorbance reading above zero? Bradford protein assa

Why is it necessary to substract this absorbance from all other results?

kondzia   2467   4 Replies

habiba

how can I calculate protein calculation (μg/ml)?

how can I calculate protein calculation (μg/ml)?

I've got standard protein and NaCl (ml)

kondzia   1073   2 Replies

rsb

How many generations does it take for a population to reach Hardy-Weinberg equilibrium?

How many generations does it take for a population to reach Hardy-Weinberg equilibrium?

can someone help me with this ?

50% brown, 25% white and 25% black; equal proportions of ea tree type, one tree stand, 4000 carrying capacity, random mating, disaster frequency "never".

How do the actual genotype freq

lolpp   6654   1 Reply

bio_man

Fertilization question?

Fertilization question?

Hey everyone so I am currently working on a lab involving observing fertilization of the egg and sperm of sea urchins. I am quite confused on one question however.
1. What would be the resulting ploidy of the embryo if 2 sperm nuclei entered the

Fightboy   5428   6 Replies

Doosay

PhysioEx 8.0 Exercise 9 Review Sheet Help!

PhysioEx 8.0 Exercise 9 Review Sheet Help!

I am having trouble with my computer/disk and I want to make sure that my answers for the Renal System Physiology Review sheet are correct. Any help would be greatly appreciated!

tallone   1330   3 Replies

bio_man

For drinkable water testing, the readycult test we use (Microbiology Lab Questions)

For drinkable water testing, the readycult test we use (Microbiology Lab Questions)

I would need some help< really appreciate it:

1.   For drinkable water testing, the readycult test we use
a.   Made more contaminated water
b.   Detected pathogens
c.   Identified viruses in the water
d.   Made genus and speci

mihaella   568   3 Replies

bio_man

Enzyme Lab Report

Enzyme Lab Report

Hello there,

Can you help me doing this lab please? This is my email: nghi.u.tran@gmail.com

Please kindly open the attached files below

Hope to hearing from you soon!

Best,
Kitty   

KittyT   4211   8 Replies

Paramedic700

German Jews were embarrassed by the __________ of the Sephardic Jews.

German Jews were embarrassed by the __________ of the Sephardic Jews.

German Jews were embarrassed by the __________ of the Sephardic Jews.
      
appearance
      
German language
      
unorthodox religious practices
      
cosmopolitanism

shellibelly   1409   1 Reply

bio_man

How much of the depth referenced in Question 7 was glacial ice with plastic prop

How much of the depth referenced in Question 7 was glacial ice with plastic prop

Lab Exercise: Glacial Features in Yosemite Valley.  Record your answer to Lab Exercise, Question 9.

How much of the depth referenced in Question 7 was glacial ice with plastic properties?

bshimek   1154   1 Reply

bio_man

mitosis indication on given picture?

mitosis indication on given picture?

Ok so the question is:
On the drawing of a longitudinal section of a root shown below (attached image), indicate the region of the root in which you see cells undergoing mitosis. Also indicate on the drawing where the youngest and oldest tissue

Fightboy   2688   5 Replies

bio_man

Protein concentration lab, calculation step?

Protein concentration lab, calculation step?

Hi everyone! So I just recently got done with a lab involving performing the Bradford Assay on a diluted protein drink sample, and was confused on one of the calculation steps.
Here is the step:
 Assuming the protein concentration value on

Fightboy   1898   5 Replies

Fightboy

Made an error setting up an osmosis experiment, wondering how I can fix it

Made an error setting up an osmosis experiment, wondering how I can fix it

Hello all,

In my Advanced Biology class (basically AP bio) we were setting up an osmosis experiment when you have to take 4 cylinders of potatoes and find the mass of them before you do anything. Then you put the cylinders in a solution (T

derstacker98   4626   3 Replies

DJR333

Color wheel problem?

Color wheel problem?

You set the spectrophotometer to 475 nm. You most likely are measuring the
absorbance of what color?


The answer was orange but i thought it was blue since blue wavelengths are in the 475 nm range. Can someone explain this to m

Fightboy   1397   3 Replies

Alexx

How does the amount of salt added to H2O2 affect the reaction rate of yeast?

How does the amount of salt added to H2O2 affect the reaction rate of yeast?

I need help on this because I did a lab and I have no idea why the addition of salt caused the reaction to occur slower. Thanks!

tommypax   1222   1 Reply

padre

Beer's law problems?

Beer's law problems?

Hey everyone I'm having issues with a problem on my protein concentration lab.
"To test your understanding of the color wheel and Beer's law, use the space below to graph the relationship between concentration and absorbance for t

Fightboy   7460   N/A

Fightboy

need an idea for a Ecological Footprint Project :(((

need an idea for a Ecological Footprint Project :(((

hello so for lab i need to come up an idea for an ecological footprint.

here is what my instructor said : OVERVIEW:
Ecological footprint calculates human’s demands on the planet by comparing human
consumption against the Earth’s

getsomelanaa   1513   3 Replies

bio_man

The DNA concentration of purified DNA is important to molecular biology because?

The DNA concentration of purified DNA is important to molecular biology because?

How does estimating the concentration of purified DNA correlate with DNA purification?
So I just finished a molecular lab and we purified our given plasmid DNA which was E. Coli then we ran a gel and from that gel we had to estimate the concent

0mg_Its_Sabby   1541   1 Reply

yukifangfang

Genetics pea plant problem

Genetics pea plant problem

in peas, axial (A) flower poaition is dominant to terminal (a), and tall (L) is dominant to ahort (l). if a plant that is eterozygous for both traits is allowed to self-fertilize, how many of the offspring would also be heterozygous for both traits?

F1.ph_D   1090   6 Replies

rphrph8

How does salt affect the enzyme activity of catalase breaking down H2O2?

How does salt affect the enzyme activity of catalase breaking down H2O2?

I'm working on this lab but i cant figure out why the salt is causing the catalase to react slower with higher salt concentrations.  I understand that the protein is being denatured but why? what ions are interacting with each other to caus

Shammyyy68   2569   4 Replies

bio_man

How to identify which sweetener is which given unlabeled sweetener packages?

How to identify which sweetener is which given unlabeled sweetener packages?

'm provided with unlabeled packets of sweeteners. Any chemicals I need are provided. I have only a microscope, a pipettor, a balance, a spectrophotometer,a hot plate, and a water bath. I know what substances are being tested and their ingredient

arooj1a2b3c   1141   2 Replies

arooj1a2b3c