Introductory Courses

Whats a control!!??

Whats a control!!??

Okay so I need to put a control on my science fair board. My brother gave me an example of one. Like you have three plants. One gets sunlight, another gets a little bit, and the third one gets none. He said the control is the third one. But how would

dbb868   556   3 Replies

gafsroom

Action potentials of an earthworm going negative first?

Action potentials of an earthworm going negative first?

Ok so for a bit of a background, I am doing a science project looking at the action potentials of the earthworm. I anaesthatized the worms then hooked them up to a spiker box (forums aren't letting me link the website. Just type in spikerbox and

IsDolan   795   1 Reply

padre

How prepare these solutions?

How prepare these solutions?

How do I prepare these solutions with substrate concentrations of 0.20, 0.40 mM, 1.00mM, 2.50 mM?
Using two stock solutions below
Solution A - Contains just buffer and Triton X-100
Solution B - Contains the above plus 5.0 mM substrate

clueless   709   1 Reply

padre

Observing Bacterial Morphology Alterations

Observing Bacterial Morphology Alterations

Does observing bacteria under a light microscope following Gram-staining provide a decent indication of changes in morphology? I.e. is one able to detect a change in (for example) coccal morphology? Or is it hard to determine what's an artefact

micro   1612   5 Replies

padre

Scientific introductions

Scientific introductions

I have to write a scientific introduction for Biology. It is on wolf spiders predatory habits and if they are affected by moonlight. My teacher told me that science has a whole nother language! I have no idea how to write a scientific introduction. P

Abby1234567890   466   1 Reply

padre

Bacterial Growth Curve

Bacterial Growth Curve

When determining the incubation period required for a bacteria species/strain to reach a particular growth phase e.g. exponential phase by plotting a growth curve, is there a standard starting OD value? (if one is using turbidity as an indirect metho

micro   2004   3 Replies

ksubiochem

The autonomic nervous system is a subdivision of the _____ nervous system

The autonomic nervous system is a subdivision of the _____ nervous system

what is the correct respond for that

mtambe   807   1 Reply

Doctor-2-B

Does anyone have any secondary data for an experiment testing pepsin and temp?

Does anyone have any secondary data for an experiment testing pepsin and temp?

For my  Science Investigation twe had to test how temperature affected enzyme activity.
We tested 5 different temperatures 0, 20,40,60 and 80 degrees with 1ml of pepsin in each test tube and put in the corresponding water bath. After 5 min

louis123   1569   1 Reply

padre

How to sterilize PLASTIC petri dish

How to sterilize PLASTIC petri dish

Hi guys, I just encounter a question about sterilization.

How to sterilize PLASTIC petri dish.
Yea, It's in PLASTIC but not glass.
I'm wondering if the plastic will melt if the dish is put in the oven or autoclave.

bio_beginner   6191   4 Replies

bio_man

different result in sex linkage

different result in sex linkage

Why there are different in the sex linkage cross?

mimi119964   796   1 Reply

padre

Web D241

Web D241

 Please complete the following short answer questions with code snippets as well as paragraphical responses. This assignment should not be an exercise in copy and paste, but an assessment of your comprehension and evaluation of the course materials.

asimas55   3700   1 Reply

padre

What are bronchioles and how do they function?

What are bronchioles and how do they function?

I need to know this for my homework. Thanks!

rmorrin1   954   1 Reply

bee2312396

How many liters of 0.154 M NaCl, solution can be prepared by dilution of 100 mL of a 6?

How many liters of 0.154 M NaCl, solution can be prepared by dilution of 100 mL of a 6?

How many liters of 0.154 M NaCl, "physiological saline," solution can be prepared by dilution of 100 mL of a 6.0 M NaCl solution?

zuelion   1480   2 Replies

Brandon24k

Electrophoresis + Western Blotting

Electrophoresis + Western Blotting

When studying the proteome of an organism / microbe very often protein extract is electrophoresed and then western blotting is performed with specific antibodies to a particular protein of interest. If the identity of a protein band after electrophor

micro   1269   3 Replies

padre

Could there be a food chain without herbivores and carnivores?

Could there be a food chain without herbivores and carnivores?

Could there be a food chain without herbivores and carnivores?

mizberries   25515   4 Replies

jbebo01

Removing C. elegans from e. coli gel

Removing C. elegans from e. coli gel

In my lab we have to use a platinum wire to transfer C. elegans (microscopic worms) from one petri dish with gel to another one for mating and phenotype determining purposes. Has anyone done a similar lab and can offer any advice for transferring the

azahoran   855   2 Replies

doubleu

HW Help please :D

HW Help please :D

Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). You measure the amount and determine that there are 7 grams of potassium-40 in the rock. By measuring the amount of its decay product (argon-40) present in the

Dmagrino   913   1 Reply

padre

AST 100 Home work question help

AST 100 Home work question help

You are analyzing Moon rocks that contain small amounts of uranium-238, which decays into lead with a half-life of about 4.5 billion years.

In a rock from the lunar highlands, you determine that 50% of the original uranium-238 remains, whi

Dmagrino   6663   3 Replies

padre

Classifying Arthropods Lab

Classifying Arthropods Lab

Does anyone have the answers to the Classifying Arthropods virtual lab please?

deeharris   12798   3 Replies

Gbre123

What are some easy high school level science experiments?

What are some easy high school level science experiments?

My teacher just assigned an experiment for us to do and it's due next Monday. What are some easy yet high school leveled experiments I can finish in 1-3 days? I've been looking around online but all the experiments I find require an acid or

boll   1034   1 Reply

savio

Neurophysiology of Nerve Impulses

Neurophysiology of Nerve Impulses

Can someone help me answer the question:
Identify which of the stimulus modalities induced the largest amplitude receptor potential in the Pacinian corpuscle.

Thanks

photo12   745   1 Reply

duddy

How can you find the internal resistance of a dry cell as accurately as possible?

How can you find the internal resistance of a dry cell as accurately as possible?

I know the general set-up of the experiment and the equation v= E-Ir. Now I need to think of modifications to improve accuracy, etc so I think I need to find a way to control the temperature in the circuit? I think using a thermistor in some way will

miao23   419   1 Reply

miap27

What should I research for my science experiment?

What should I research for my science experiment?

My science teacher wants 3 pages of research, but I don't know what to research. My experiment is going to be on how long drinks keep cold. I already know I have to research density, but what else?

freddy0622   407   1 Reply

denver413

In a laboratory experiment, a heat engine takes in 200 J of heat and does 60 J of work by expanding in a rever?

In a laboratory experiment, a heat engine takes in 200 J of heat and does 60 J of work by expanding in a rever?

In a laboratory experiment, a heat engine takes in 200 J of heat and does 60 J of work by expanding in a reversible process. What is the change in internal energy of the engine during this process?
we have a whole new set of problems due monday and

buddysp_vn   637   2 Replies

nateybbb

PhysioEx exercise 2 lab solutions

PhysioEx exercise 2 lab solutions

PhysioEx Exercise 2 activities 1-9

sunny 4000   1020   5 Replies

padre

Ultraviolet Radiation

Ultraviolet Radiation

What is the wavelength of near UV and how UV is classified?

ClassTeacher   620   1 Reply

Doctor-2-B

Devising protocols

Devising protocols

Undergrad here. Need to devise protocols which i've never did before and which seem to be used by several papers but obviously papers do not give full details like quantities of reagents used, how they were added etc. Are there websites other th

micro   1890   8 Replies

kavakona

Microscope coverslip alternatives

Microscope coverslip alternatives

We've run out of coverslips in our lab. Is there anything we can use that will work just as well?

Student.Q   1059   1 Reply

duddy

Chemistry help, please!

Chemistry help, please!

Having a real brain fart on these questions, could anyone please help me out? Thanks a lot!

Ammonia gas decomposes according to the equation: 2NH3(g) → N2(g) + 3H2(g) If 20.0 L of nitrogen is formed at STP, how many liters of hydrogen will

misterrvincen   1454   1 Reply

misterrvincen

Using lysozyme to lyse cells

Using lysozyme to lyse cells

If you treat cells with lysozyme/an enzyme to lyse the cell and obtain protein cell lysate to perform electrophoresis, how does one get rid of the lysozyme so it doesn't appear on the gel? Also, if boiling is used to denature proteases, how come

micro   775   5 Replies

padre

What is the name of the type of reaction that you see in this demonstration? Describe IN YOUR OWN WO

What is the name of the type of reaction that you see in this demonstration? Describe IN YOUR OWN WO

Can anyone help me with this lab? Or have it completed? Please and thank you.

PART 1

Begin by viewing the following Thinkwell video

13.3.2    CIA Demonstration: The Synthesis of Nylon

After you wa

misterrvincen   5600   1 Reply

padre

Graphing Controlled and Experimental data same graph?

Graphing Controlled and Experimental data same graph?

Hey everyone, I'm new to this forum but I could really use some help. I'll try to keep my question as brief as possible and hope to get and answer!

Basically I have done a lab in my bio class where we measure the heart rate of da

danep123   1020   4 Replies

padre

If a plant cell has a lower water than its surrounding environment.....

If a plant cell has a lower water than its surrounding environment.....

If a plant cell has a lower water potential than its surrounding environment and if pressure is equal to zero, is the cell hypertonic (in terms of solute concentration) or hypotonic to its environment?  Will the cell gain water or lose water?

LexRunner408   6468   2 Replies

bat21bit

What is water potential of potato cell?

What is water potential of potato cell?

I'm doing a potato lab in my AP Bio class and am confused on how to calculate the water potential of the potato cell.
The equation to calculate for water potential is Ψ = 0 + Ψs. Ψs is the solute potential and the equa

LexRunner408   11447   8 Replies

vanbu

Suppose your instructor handed you a bottle of hydrochloric acid of unknown concentration. The chemi

Suppose your instructor handed you a bottle of hydrochloric acid of unknown concentration. The chemi

I'm having issues solving these last few questions. Can someone please me out? Thanks.

(k) Suppose your instructor handed you a bottle of hydrochloric acid of unknown concentration. The chemistry department was considering using it fo

misterrvincen   5158   3 Replies

savio

Can someone help me explain gel electrophoresis in relation to amino acids?

Can someone help me explain gel electrophoresis in relation to amino acids?

Can someone help me explain gel electrophoresis in relation to amino acids?

buk280forlife   1537   2 Replies

vcm2223

What other oil can we use in place of immersion oil in light microscopy?

What other oil can we use in place of immersion oil in light microscopy?

And also can you please tell me what would happen if I use the oil with an ordinary dry objective lens instead of an immersion lens?

irina   1323   2 Replies

irina

Harvesting Bacteria in Exponential Phase

Harvesting Bacteria in Exponential Phase

How does one get to know if bacteria are in the exponential phase or not in a culture? "Bacteria were harvested in the exponential phase and centrifuged at 4,000 xg".

micro   1444   3 Replies

buchwurm952

Why do atoms and molecules follow specific physical laws like inviible actions?

Why do atoms and molecules follow specific physical laws like inviible actions?

Consider Rom. 1:20.  There is reference to the invisible attributes of God.  There are many details engineered into creation that we do not see.  The invisible action of enzymes is one aspect.

gameladams   855   1 Reply

bio_man

Basic Lab Equipment

Basic Lab Equipment

I am looking into some basic lab equipment to buy for myself to set up a basic lab environment. Do you have any suggestions of a supplier with no-so-sophisticated/advanced equipment with reasonable prices? I'm thinking: micropipettes, tips, smal

micro   2337   5 Replies

maggie L.