Cell Biology

reabsorption of glucose and Na+

reabsorption of glucose and Na+

Explain the reabsorption of glucose and Na+ from the lumen of the nephron tubule into the
blood, using both the Na+/K+ ATPase and Na+/glucose transporter in your answer. Use a
diagram if necessary.

KaGi   3865   4 Replies

Biology Forums

digitalis and ultimate effect on on cytoskeletal protein

digitalis and ultimate effect on on cytoskeletal protein

What specific cytoskeletal protein has its function altered as the ultimate effect of digitalis?

faraz   1620   2 Replies

duddy

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

millionairemind   2995   2 Replies

Biology Forums

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 l

NeedsAPbiohelp   1255   2 Replies

sarah!

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?

bari21e   2348   1 Reply

bio_man

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

marinoumali   1224   2 Replies

bio_man

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

mikeee   4404   5 Replies

bio_man

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 t

Crazyeagle567   2306   2 Replies

bio_man

Antimicrobial compounds

Antimicrobial compounds

For the following antimicrobial compounds, tell why each inhibits the growth of microogranisms, and why each is selectively toxic (why they are relatively non-toxic for the host)

1) penicillin
2) Steptomyocine
3) Azidothymidine

chels194   1658   1 Reply

bio_man

The following shows a restriction endonucleases cleave DNA. abbrev R represents the purines (A&G) ...

The following shows a restriction endonucleases cleave DNA. abbrev R represents the purines (A&G) ...

The following shows a restriction endonucleases cleave DNA. abbrev R represents the purines (A&G) and pyrimidines (C, T & U) are abbrev Y. The abbrev W represents A or T.

Enzyme: PpuMI
Targe Sequence: 5' RGGWCCY 3'

alatq33   12331   3 Replies

bio_man

In tetrahybridism with 4 independent genes, the F2 produces:

In tetrahybridism with 4 independent genes, the F2 produces:

In tetrahybridism with 4 independent genes, the F2 produces:

a) 81 phenotypes for all pairs of alleles in the dominant condition
b) 16 genotypes for all pairs of alleles in the dominant condition
c) 24 phenotypes for one pair of

karim89   2481   7 Replies

karim89

Glycolysis and pyruvate

Glycolysis and pyruvate

Glycolysis converts glucose to pyruvic acid.
1) List 2 compounds, other than glucose, which are required for this process and why they are required.
2) Then, list 3 compounds, other than pyruvate, which are produced by this process and wh

chels194   2147   5 Replies

bio_man

How do Gatorade drinks rehydrate their user's cells?

How do Gatorade drinks rehydrate their user's cells?

Gatorade & other sports drinks are actually hypotonic solutions. How do these drinks rehydrate their user's cells?

brinkleyracing   21720   3 Replies

lewis

Name the chemical test based on a metabolite that can be used to distinguish between these: Pseudomo

Name the chemical test based on a metabolite that can be used to distinguish between these: Pseudomo

Can you guys help me with these questions I cannot find them in my book
Thank you
Name the chemical test based on a metabolite that can be used to distinguish between these:Pseudomonas Vs E. Coli
Salmonella Vs E. Coli
pathoge

Marin797   2632   3 Replies

bio_man

Na+-glucose help!

Na+-glucose help!

Na+-glucose facilitated diffusion transporters move sodium ions along with glucose molecules from the outside (extracellular space) of cells to their cytoplasms. During operation of the Na+-glucose facilitated diffusion transporter does the affinity

bunton33   1496   3 Replies

bunton33

sodium ion channels.

sodium ion channels.

Consider two different sodium ion channels that are both in the same cell’s PM. One of the channels (A) allows 20,000 Na+ ions/second to enter the cell, while the other one (B) allows only 2,000 Na+ ions/sec to enter. How are these two Na+ channels l

bunton33   1583   3 Replies

bio_man

cells and sodium pumps

cells and sodium pumps

What would happen to a cell if you were to suddenly and completely inhibit its Na+/K+-ATPase (sodium-pump)?

mlsmiddie   1536   1 Reply

bio_man

Cite metabolites, other than antibiotics, produced by microorganisms that can inhibit the growth of

Cite metabolites, other than antibiotics, produced by microorganisms that can inhibit the growth of

cite metabolites, other than antibiotics, produced by microorganisms that can inhibit the growth of other microorganisms.

i badly need the answer. thanks, guys! 

kyrbi   1990   1 Reply

bio_man

What is the specific mode of action and the target organisms of each of the three antibiotics?

What is the specific mode of action and the target organisms of each of the three antibiotics?

What is the specific mode of action and the target organisms of each of the three antibiotics? plate cultures of E.coli, Bacillus cereus and Staphylococcus aureus are used.
a. ampicillin
b. polymyxin
c.

kyrbi   1862   3 Replies

bio_man

Whats the melanin pathway & what are the functions of the genes in this pathway?

Whats the melanin pathway & what are the functions of the genes in this pathway?

I am writing this for a lab report.  Here is what I have so far

The three loci involved in the regulatory and biochemical pathways for melanin production in mice are albino (C), brown (B), and slaty (A). Respectively, these three gene

Shamrock   2774   1 Reply

duddy

micro

micro

True or False... Superoxide radicals are converted to H2O2 by superoxide dismutase in bacteria growing in O2.

oceansweet   1455   1 Reply

bio_man

Which enzyme catalyzes the reaction H2O2 plus 2H+ yields 2H2O ?

Which enzyme catalyzes the reaction H2O2 plus 2H+ yields 2H2O ?

Which enzyme catalyzes the reaction H2O2 plus 2H+ yields 2H2O ?

 a. peroxidase

 b. catalase

 c. superoxide dismutase (SOD)

 d. all of above

 e. none of above

oceansweet   2034   1 Reply

bio_man

Am I predicting the correct genotype for the parental mice given these crosses?

Am I predicting the correct genotype for the parental mice given these crosses?

Here are the crosses:

1) Albino 1 x Black
F1 = all black
F2 = 3 black
1 albino

2) Albino 2 x Agouti
F1 = all agouti
F2 = 3 agouti
1 albino

3) Agouti x Black
F1 = all agouti
F2 =

Shamrock   3018   9 Replies

bio_man

Neurobiology Questions

Neurobiology Questions

Hi! I need help with the following questions. Please help. Thank you.

1. In a voltage clamp experiment, Hodgkin and Huxley first clamped an axon at 0 mv and then at +60 mV. Assuming ENa+ is +60 mV and EK+ is -80 mV, when compared with the

biol245   3148   9 Replies

bio_man

Dominant and recessive alleles and habitat

Dominant and recessive alleles and habitat

Hi guys,

enjoying reading through these posts however i have a problem of my own i could do with a helping hand

I have a question on an article http://www.pnas.org/content/107/5/

Eranu   2967   8 Replies

Eranu

Which of the following is best to sterilize heat-labile solutions?

Which of the following is best to sterilize heat-labile solutions?

1. Which of the following is best to sterilize heat-labile solutions?

 a. dry heat

 b. autoclave

 c. membrane filtration

 d. pasteurization

 e. none of above

2. Which of the following

oceansweet   5130   1 Reply

bio_man

Cell Biology Methods

Cell Biology Methods

What is the difference between the Western blot and  immunocytochemistry. What are the benefits and drawbacks of each?

fifo2007   1639   2 Replies

fifo2007

micro

micro

Which of the following do not cause hospital-acquired (i.e. nosocomial) infections?



 a. Ability of some bacteria to metabolize disinfectants.

 b. Gram-negative bacteria are often resistant to disinfectants.

oceansweet   1315   1 Reply

star

Fuction of histone

Fuction of histone

Histones interact with DNA in order to:?
1. counteract the positively charged phosphates in the DNA backbone and allow it to coil more tightly.
2. protect bacterial chromosomes from chemical mutagens.
3. regulate expression of the DNA

chang190   1371   1 Reply

bio_man

Na+ K+ transporter.

Na+ K+ transporter.

The Na+/K+ ATPase (the sodium pump) moves 3Na+ out of and 2K+ into cell cytoplasm. Each ion moves up its electrochemical gradient. In a normal cell, why don't Na+ ions enter and K+ ions leave the cell (each going down its concentration gradient)

bunton33   1411   5 Replies

bio_man

What is a gap junction? (Neurobiology Questions)

What is a gap junction? (Neurobiology Questions)

Hi. I need help with the following questions. Thanks.

1. The vesicle protein which normally binds calcium and triggers exocytosis is:

 

   A. synapsin    
 

   B. synaptophysin    
 

   C. syna

biol245   2029   1 Reply

sarah!

microbio

microbio

1) Name a major product (biochemical) each of the following provides for the cell and list its subsequent use?

Glycolysis       Product: _NAD? ___________             Use:___________
Respr

chels194   1104   1 Reply

bio_man

One batch of isolated, purified mitochondria was placed into a pH 7.2 solution

One batch of isolated, purified mitochondria was placed into a pH 7.2 solution

One batch of isolated, purified mitochondria was placed into a pH 7.2 solution. Another batch of identical mitochondria was placed into a pH 3.2 solution. The rates of electron transport in the two batches were measured. At pH 7.2 the rate was normal

bunton33   2927   7 Replies

Biology Forums

micro

micro

True or False...

1. The two major halogens used for disinfection are iodine and chlorine.

2. Ultraviolet light is a type of ionizing radiation.

3. Filtration through membrane filters with a pore size of 0.45 microns w

oceansweet   1162   3 Replies

bio_man

Cell Division

Cell Division

Can someone explain the 4 divisions of cell in layman's terms my text is horrible! 

Prophase
Metaphase
Anaphase
Telophase



they are not going into the sections of prophase at all, I'm

mom25grls   1086   1 Reply

bio_man

Active Transport Pumps

Active Transport Pumps

Are active transport pumps subject to the same type of competitive inhibition that facilitated transport receptors and enzymes are?

crazzyjazzy   1576   1 Reply

sarah!

Probability

Probability

1. A man whose maternal grandfather had galactosemia (a rare autosomal recessive metabolic disease) married a woman whose sister had galactosemia. The woman is now pregnant with their first child.

b) (1pt) What is the probability that the

Babygal   3033   1 Reply

bio_man

How are calcium ions extruded from a cell?

How are calcium ions extruded from a cell?

Describe how a eukaryotic cell can extrude calcium ions from the cytosol to the extracellular fluid?

This is what I am thinking:

So I know calcium concentration is kept low in the cytosol.

Would the Ca2+ ions just dif

crazzyjazzy   1313   1 Reply

bio_man

Need Help With Experimental Design...?

Need Help With Experimental Design...?

I'm writing a research proposal for undergraduate school. I'm wanting to test the effects of active ingredients of dental products against cultures of Streptococcus mutans. The active ingredients I'm currently thinking are sodium flour

ostste   1950   7 Replies

bio_man

Which one of the following molecules would least likely be used during DNA replication?

Which one of the following molecules would least likely be used during DNA replication?

Which one of the following molecules would least likely be used during DNA replication?

 1. dUTP
 2. dGTP
 3. CTP
 4. dTTP
 5. UTP

only one of them is correct

chang190   1043   1 Reply

bio_man