Latest Topics

Why does cyanide act so quickly?

Why does cyanide act so quickly?

why does cyanide act so quickly?
explain this using active transport as part of your answer

High School Level Science   juicylucy   1625   3   bio_man   13 years ago

In human embryo, does the middle ear have an ectodermal or mesodermal origin?

In human embryo, does the middle ear have an ectodermal or mesodermal origin?

in human embryo, does the middle ear have an ectodermal or mesodermal origin ?

also if anyone has links to websites with videos or detailed pictures of the different steps in echinoderms, amphibians, birds and mammals embryogenesis plz post them.

Genetics and Developmental Biology   karim89   3093   4   bio_man   13 years ago

Amino acids phosphorylation

Amino acids phosphorylation

Which of the following amino acids could be a target for phosphorylation, and why?

The options are:

Phe, Tyr, Ala, Asp, Ser, Cys, Thr.

Biochemistry   jonas   1445   bio_man   13 years ago

What specific cytoskeletal protein (or proteins) has its function altered as the ultimate effect of ...

What specific cytoskeletal protein (or proteins) has its function altered as the ultimate effect of ...

Hey, my question was:

What specific cytoskeletal protein (or proteins) has its function altered as the ultimate effect of digitalis?

My thought was microtubule associated proteins but I wasn't sure of the specific one.

Thanks for any help!

General Biology   faraz   1560   3   duddy   13 years ago

Microbiology Basics: an Antimicrobial Perspective

Microbiology Basics: an Antimicrobial Perspective

Great link on microbiology! 

Microbiology Basics: an Antimicrobial Perspective

http://wwwdev.science.uoit.ca/MicroBiology/index.html

Links   sarah   1784   duddy   13 years ago

The red kernel color in wheat is caused by the presence of at least one dominant allele from each of ...

The red kernel color in wheat is caused by the presence of at least one dominant allele from each of ...

The red kernel color in wheat is caused by the presence of at least one
dominant allele from each of two independently segregating gene pairs (e.g.,
R-B-). Wheat plants with rrbb genotypes have white kernels, and plants with
genotypes R-bb and rrB- have yellow kernels. You cross a plant true
breeding for red kernels with a plant true breeding for white kernels.

Cell Biology   millionairemind   2999   2   Biology Forums   13 years ago

wrtiting a hypothesis

wrtiting a hypothesis

heyy! I am doing a science lab report and my problem is this:
1.   Are corn seeds of type I (no treatment) and type II (heat treatment) viable?
2.   Does the heat exposure affect corn seed viability?

is this hypothesis a good one?
If the seed was accidentally boiled then the seed won’t grow because the heat will kill the seed.

Introductory Courses   myribaumann   1900   2   sarah!   13 years ago

AP BIO help?

AP BIO help?

My AP  BIO book says each DNA molecule is made up of two long chains arranged into what is called a double helix. Each link of a chain is one of four kinds of chemical building blocks called nucleotides.

My question is what's a link of a chain? Is it a segment of a double helix chain? If So, is ONE segment/link just one type of the four kinds of nucleotides (Ade

Cell Biology   NeedsAPbiohelp   1258   2   sarah!   13 years ago

Between ionic and covalent (chemical bonding) need help understanding..

Between ionic and covalent (chemical bonding) need help understanding..

Last I took Biology was during high school years. Now I'm getting old so may be some of you students can help me out with this for my school project. Would to get some more insight of the two types of bonds. May be a quick summarize so I can understand this a little better rather than reading the chapter from the book. 

General Biology   rb40gte   2468   3   karim89   13 years ago

lipids and carbs

lipids and carbs

How much energy per gram do carbs provide?
How much do lipids provide?

High School Level Science   dancerr   1222   4   karim89   13 years ago

Basic zoology

Basic zoology

http://animaldiversity.ummz.umich.edu/site/index.html

Links   karim89   3846   bio_man   13 years ago

Giant Humans

Giant Humans

i've just read something talking about the existence of giant humans in the past and i searched the web to find something about that but i couldn't... so has anyone ever heard of this ? and are there any scientific evidences supporting this theory ?

News Articles and Discussion   karim89   2169   6   chemb   13 years ago

Sensory adaptation Bio help!!!

Sensory adaptation Bio help!!!

I really need help on this question! Any would be greatly appreciated:

Sensory adaptation occurs when the brain filters out repetitious and or insignificant information. A correct example of sensory adaptation is:
A. a fine "vintager" (wine taster) can differentiate the unique taste among various blended wines given to him to evaluate
B. A person who i

High School Level Science   BIOLOGY FREAK   2526   3   bio_man   13 years ago

What are the functions of a Biomembrane?

What are the functions of a Biomembrane?

My professor told my class that their are a few functions but I was not able to write them down. Can you please help me?

Cell Biology   bari21e   2350   bio_man   13 years ago

Matter, Isotopes and Buffers Homework Help

Matter, Isotopes and Buffers Homework Help

I have a small presentation I have to do for my biology class and the topics were chosen at random. The point of the presentation is to connect the topics together and explain how they relate. My problem is that I can't find a relationship between the three topics to talk about.

The three topics are: Matter, Isotopes and Buffers

Relating everything to matt

Biochemistry   dinosaur5   1796   3   bio_man   13 years ago

Receptor help!!

Receptor help!!

I need help with this question, desperately:
All of the following are matches of a stimulus detected by the correct receptor except
A. driving down a winding country road--> hair cells in the semi-circular canals
B. light rays of the visible spectrum--> cones and rods in the retina of the eye
C. burning radiant energy from a hot stove--> osmoreceptor in

High School Level Science   BIOLOGY FREAK   2435   5   13 years ago

PHysiology questions plz help

PHysiology questions plz help

1)How does electrical stimulus excites the cell?

2)my teacher said the following can you plz explain?

"understand that the threshold of a neuron is not a constant value of trans membrane potential but more closely related to the charge across the membrane "

Anatomy and Physiology   iwanttoknow   1417   bio_man   13 years ago

Chromatography identifying an unknown compound?

Chromatography identifying an unknown compound?

what is a practical uses for the process of identifying an unknown compound using chromatography.

General Biology   jj231   5164   2   duddy   13 years ago

bioloigy lab

bioloigy lab

I am trying to do this pre-lab stuff and the lab manual doesn't explain things well. Thanks if you can help.......Calculate the amount of 0.1 M sucrose solution and the amount of dH2O needed to prepare 100 mL of unbuffered 20 mM sucrose. I am following the formula c1v1=c2v2  Is the correct answer 20.0 mM? and what is the amount of dH2) needed. thanks

Introductory Courses   oldcollegelady   1199   3   bio_man   13 years ago

Functionality of carbohydrates

Functionality of carbohydrates

Hello fellow scientists!
This is my first topic here, and I look forward to enlarging my knowledge on this forum!

So, in school we talked about carbohydrates briefly. I know that they are grouped by the number of carbon atoms and so on. Now, we all know that carbohydrates have 3 types of function: structural, protective, and energetic. But, what I want to know is:

Biochemistry   CLukic   2315   9   bio_man   13 years ago

auditory/ vs. optic nerve

auditory/ vs. optic nerve

hi guys, I need help again! This question is kinda tricky though.. I have to say..:
Consider what would happen if the optic nerve from your eye and the auditory nerve from your ear were switched. if during a thunderstorm you saw lightning,  you
A. would hear strange noises and see repetitive lightning flashes
B. may see multiple lightning flashes but would hear n

High School Level Science   BIOLOGY FREAK   4665   6   bio_man   13 years ago

Examine the relationship b/n surface area:volume ratio & rate of diffusion?

Examine the relationship b/n surface area:volume ratio & rate of diffusion?

Experiment: Examine the relationship between surface area to volume ratio and the rate of diffusion?
This was done with pink agar blocks of varying dimensions.Ive recorded the data (time and dimensions) keeping the volume of acid constant. How do I calculate the rate of diffusion with that data?For example 2 x 2 x 1 cm3 took 7minutes 39 seconds in 5cc of HCl. Any help is apprec

High School Level Science   FerielCullen   2183   bio_man   13 years ago

Hi! need help about my assigntment

Hi! need help about my assigntment

why is it that only one egg cell is produced after meosis while 4 sperm cells are produced in the male
 and
What are the deformities in the sperm cell and egg cell?

High School Level Science   marinoumali   940   bio_man   13 years ago

How do I predict the genotypes produced?

How do I predict the genotypes produced?

Lets say we cross AaBbCcDdEe with AaBbCcDdEe. How many different genotypes will occur?
The answer is 3^5 = 243 genotypes. Where do the 3 and the 5 come from?

I know that AaBbCcDdEe will produce 32 kinds of gametes because 2^5= 32. I know that in this case 5 represents the number of heterozygous pairs. Perhaps the five in 3^5 comes from the number of number of possi

General Biology   confused_student   35300   6   13 years ago

If the curvature along the horizontal axis of the cornea of the human eye is less than the curvature

If the curvature along the horizontal axis of the cornea of the human eye is less than the curvature

Hi guys, I need some more help, any would be appreciated:
If the curvature along the horizontal axis of the cornea of the human eye is less than the curvature along the vertical axis, the result is:
A. nearsightedness
B. astigmatism
C. farsightedness
D. tunnel vision
I have an idea... but I don't want to influence your choices... so tell me what yo

High School Level Science   BIOLOGY FREAK   8852   4   13 years ago

Eye muscle function is rather unique as one muscle, the superior oblique...

Eye muscle function is rather unique as one muscle, the superior oblique...

Hey guys, I really need help with this one.
It's kind of tricky. I have this diagram labeled with the eye, and it shows its muscles (the extrinsic muscles of the eye)
and I have to answer the follwoing:

Eye muscle function is rather unique as one muscle, the superior oblique, passes through a loop called the trochlea. If the superior oblique is contracted,

High School Level Science   BIOLOGY FREAK   5731   bio_man   13 years ago

Hi! need help about my assigntment

Hi! need help about my assigntment

what are the deformities of the sperm cell and egg cell?
 and why
why is it that only one egg cell is produced after meosis while 4 sperm cells are produced in the male

Cell Biology   marinoumali   1229   2   bio_man   13 years ago

Synthetic Life

Synthetic Life

This article focuses on a group of researchers aimed to create a synthetic organism containing the bare minimum amount of genes required for life. Their objective is to shed light on what is fundamentally required for cellular life.

Bio ethical concerns can easily arise from such a topic, and ethical debates such as 'playing god' can be argued.

[url=htt

News Articles and Discussion   doubleu   998   star   13 years ago

The hypothalamus is connected directly to the

The hypothalamus is connected directly to the

Hey, I need help with the following:
the hypothalamus is connected directly to the
A. pons
B. medulla oblongata
C. pituitary
D. cerebellum

I'm not too sure, I think I know the answer but I don't want to influence your choice lol. Any help would be greatly appreciated.
Thanks

High School Level Science   BIOLOGY FREAK   2621   5   bio_man   13 years ago

Conscious efforts to control body responses through biofeedback originate in the

Conscious efforts to control body responses through biofeedback originate in the

biofeedback consists of conscious efforts to control body responses that are normally involuntary. Some individuals have used this technique to lower their breathing rate and heart trate. Conscious efforts to control body responses through biofeedback originate in the
A. medulla oblongata
B. hypothalmus
C. cerebellum
D. cerebrum

thanks.

High School Level Science   BIOLOGY FREAK   7794   3   bio_man   13 years ago

Calculating the coefficient of inbreeding?

Calculating the coefficient of inbreeding?

I'm trying to calculate the COI of a dog but seem to get the wrong COI based on two different software.
The dog is line breed on 3 dogs, 4-5, 4-5, 3-4. The 3 dogs are outcrosses. The 2 softwares give me 1.5625%.

When calculate it by hand, I get 2.34375%.
4-5 -------> 0.00390625
4-5 -------> 0.00390625
3-4 -------> 0.015625

What

Cell Biology   mikeee   4406   5   bio_man   13 years ago

bio help

bio help

all of the following factors contribute to the resting membrane potential except
A. sodium ions and potassium ions use a pump and ATP to move across the neural membrane
B. special voltage gates (socium and potassium) operate in normal neuron impulse transmission
C. some negatively charged proteins and chloride ions are unable to diffuse out of the neuron
D. the a

High School Level Science   BIOLOGY FREAK   2561   bio_man   13 years ago

Is there a difference between the reflex response time for a monosynaptic reflex and a polysynaptic ...

Is there a difference between the reflex response time for a monosynaptic reflex and a polysynaptic ...

I would really appreciate if you help me with the following questions.

2. Is it possible to inhibit a monosynaptic reflex?

3. Is there a difference between the reflex response time for a monosynaptic reflex
and a polysynaptic reflex?

4. Is there a difference in reaction time or reflex response time when the subject is
given a consistent wa

Anatomy and Physiology   iwanttoknow   1366   bio_man   13 years ago

Understand the concept that the threshold of a neuron is not a constant value of trans membrane ...

Understand the concept that the threshold of a neuron is not a constant value of trans membrane ...

My teacher said

understand the concept that the threshold of a neuron is not a constant value of trans membrane potential but more closely related to the charge across the membrane

can you please explain

Anatomy and Physiology   iwanttoknow   1717   JoAnne   13 years ago

preparing unbuffered and buffered solutions of 20mM sucrose

preparing unbuffered and buffered solutions of 20mM sucrose

In the lab is the follwoing stock solutions:
0.1 M (100.0 mM) sucrose
0.2 M(200.0 mM) acetic acid
0.2 M(200.0 mM) sodum acetate
0.2 M (200.0mM) anhydrous sodium carbonate
0.2 M (200.0mM) sodium bicarbonate

The acetate buffer consists of acetic acid and acetate ions. A chemistry reference indicates that a solution containing 40mM acetic acid and 60

Introductory Courses   oldcollegelady   5612   5   Biology Forums   13 years ago

chemestry

chemestry

how does chemicals affect the environment

Other   vjae   1177   bio_man   13 years ago

Possible New Kind of Malaria Vaccine

Possible New Kind of Malaria Vaccine

Researchers have found an antigen, AnAPN1 that triggers humans to create antibodies that prevent transmission of malaria by mosquitoes. If a mosquito takes in enough of these anitbodies the disease can be 'locked' into it and become untransmissable. Though this is promising, the problem lies in getting it into the mosquitoes. The proposed mechanism is throw their food source

News Articles and Discussion   star   944   biolove   13 years ago

Project on Centriole's Help.

Project on Centriole's Help.

I need some things about my project on centrioles.
I need these questions answered.

• What job or service does your organelle provide for the cell?
• What organelles does your organelle work with in order to help the cell perform its functions?
• What cell processes is your organelle part of? (Example: Cell Reproduction, cell transport

Cell Biology   Crazyeagle567   2310   2   bio_man   13 years ago

Which Complex carbohydrate contains only a-1, 4-glycosidic linkages?

Which Complex carbohydrate contains only a-1, 4-glycosidic linkages?

Which Complex carbohydrate contains only a-1, 4-glycosidic linkages?
A) Amylopectin
B) Cellulose
C)Amylose
D) Glycogen
E)Glucose

Which of the following complex carbohydrates is listed with its correct function?
A) Chitin:constituent of bacterial cellwalls
B) Cellulose: structural component of plant cell walls
C) amylose:main compone

General Biology   psiu2   19590   9   nite_n_day   13 years ago

What is a trans-fat and why do think it is harmful? In terms of biology, can you give me some ...

What is a trans-fat and why do think it is harmful? In terms of biology, can you give me some ...

What is a trans-fat and why do think it is harmful? In terms of biology, can you give me some insights for my own knowledge and self-study for my class?

Thanks everyone..

General Biology   rb40gte   2872   4   star   13 years ago