4
votes
2answers
105 views

I have a black tiny bug crawling all over the house

This bug is crawling all around the house it stays within the shadows and moves very very slow, i have never seen it jump or run, it just moves very slowly P.S. those bugs as u can see are smaller ...
-1
votes
0answers
19 views

Protein secondary structure prediction

I'm trying to predict the protein secondary and 3-D structure for the sequence [Q1NN20] and need some help getting the ball rolling. I'm getting confused with how and when to use Jpred, swiss-mod, ...
0
votes
0answers
28 views

The future of human evolution [on hold]

While in college I read a book that said human have stopped evolving internally, but rather we now evolve externally in the form of technology, ie instead of growing claws we make a knife. Is this ...
3
votes
1answer
18 views

Does the palate truly house the sense of taste?

Source: Your “palate” is the roof of your mouth, and by extension, your sense of taste. I was reading Etymonline's entry for palatable {adj.}, which cites and derives from palate {noun}: ... ...
7
votes
2answers
1k views

Is blood an organ according to biology?

It consist approximately 7 percent of body weight. By definition organ is composed of multiple tissues. Blood is a fluid, a circulating tissue. Therefore can we call this fluid system a liquid ...
2
votes
1answer
20 views

Why are 2 electrons transported from photosystem II at the same time?

I only know that electrons are captured by the primary electron acceptor and then go through the electron transport chain, ultimately ending up at photosystem I. But why do 2 leave photosystem II in ...
4
votes
1answer
27 views

What is the difference between intrinsic and extrinsic apoptosis?

Hello my Professor has been teaching about apoptosis and sometimes makes the distinction between extrinsic and intrinsic. I am not sure if I know for sure what this means. Does this just refer to ...
1
vote
0answers
22 views

What's a good simple test for cDNA library quality?

How do I assess the quality of a cDNA library? I want to clone CDS copies of genes from a library, but I don't know what's a typical expectation of getting a full length clone even for a shorter ...
4
votes
1answer
29 views

Are all protein composed of all the amino acid (in animal) or are there less diverse protein?

I have a question about amino acid composition of proteins: Are there proteins in animals that are made up only from a small subset of amino acids? So instead of all 20 amino acids let's say only 6-14 ...
3
votes
1answer
42 views

Why do some proteins “use” a beta barrel structure instead of alpha helices in transmembrane space?

Most proteins are fixed in the membrane by alpha helices. But some use beta barrels. Wikipedia describes beta barrels as used for porins, preprotein translocases, and lipocalins. To me, a coiled coil ...
4
votes
1answer
30 views

Are stem cell lines also kept worldwide like HeLa cells?

There are HeLa cells, which were taken from sick cancer patient and now is growing worldwide in different laboratories for experiments. HeLa cells can be kept because they are immortal and so they are ...
0
votes
0answers
8 views

What light conditions facilitate communication between birds with black and white plumage?

I'm studying two populations of birds: Population A and Population B Population A has a small white patch on its neck. Population B has a large white patch on its neck. See attached diagram. It is ...
4
votes
1answer
18 views

In human females one X chromosome is inactivated forming Barr Body. Then How exactly Haemophilia is dominant? check description for details

Suppose a female has one X chromosome normal and one chromosome with Haemophilic gene. Now suppose if the X chromosome which is normal is inactivated will the female show haemophilia?
4
votes
2answers
118 views

Do acetyl-CoA, acetyl-CoA carboxylase and acetyl-glutamate carry any charge?

Do the following compounds have any charge? If not, then why? If yes, is there any database that would give me this information if the compound is negatively or positively charged? The compounds are ...
8
votes
1answer
55 views

What is the difference between influenza A and B viruses that causes their distinct seasonal patterns?

I recently learned from an answer at health.SE* that influenza B tends to occur later in the season compared to influenza A. According to the graph in that answer, during this year’s flu season the ...
2
votes
1answer
22 views

Is RNA polymerase affected by proteins bound to the coding sequence of a gene?

I am designing a synthetic gene construct to express genes in E. coli driven by either Ptet or PLacO. The construct would look like: -Ptet-(Gene1)-PLacO-(Gene2)- I want to express each gene using ...
3
votes
0answers
34 views

Y Chromosome in Ovary Cancer Data

I have been analyzing TCGA Ovary Cancer data. In Somatic Mutation data, there is data of mutations in all the chromosomes (1-22 and X), but amazingly, I have found one (just one) row of Y Chromosome ...
8
votes
1answer
36 views

When do plasmids replicate relative to its host cell cycle?

For plasmids is so much shorter than their host cell's genome (about 1/1000 in my case), it will take only 1/1000 time for it to replicate. With respect to cell cycle, when will that replication ...
3
votes
1answer
22 views

Mammal vs Placental Mammal

So for Google Earth Day's quiz I ended up being a "Pangolin." Turns out I had no idea what it was so I looked into it and honestly it reminded me a lot of an Armadillo. So I decided to find out the ...
-1
votes
0answers
47 views

Evolutionary explanation for women having long hair, wearing jewels, stockings and high heel shoes [on hold]

What would be the evolutionary explanations for women using make up, waring cumbersome clothes, and keeping long hair. Or is it just a cultural convention?
5
votes
1answer
38 views

what is linkage disequilibrium supposed to measure?

During reading about genetics I came across with the term of linkage disequilibrium, and I do not really understand what it supposed to mean. What is linkage disequilibrium? My current understanding ...
6
votes
0answers
32 views

What are the survival limitations of alcohol?

This question was inspired by watching one of the Pirates of the Caribbean movies; particularly where Jack Sparrow allegedly survives on a desert island by finding an unlimited supply of rum. I've ...
7
votes
0answers
42 views

Biostatistics: Pollen dispersal directionality

What Information am I looking for? Think about a tree that is sending pollen all over the place. Because of wind, most pollen grain will go toward one direction. Imagine, we split the 2D area around ...
2
votes
1answer
22 views

Is cysteine deficiency possible?

Is there such a thing as cysteine deficiency in humans or other mammals? What effects would such a deficiency have? As I understand it, most cysteine for humans comes from dietary sources, though it ...
4
votes
0answers
35 views

Does the body have a gate control for pain

I understand it is not the most accurate source but I recall a House episode where he claimed the body had a control mechanism for pain in which only the most painful thing was felt. Is that true? and ...
2
votes
1answer
45 views

Modeling inclusive fitness

Consider a population of two altruist with coefficient of relatedness $r$. The average inclusive fitness of this population will be $w_{0} + br -c$. Like in this example, assignment of inclusive ...
2
votes
1answer
26 views

Help reading gene markers

I'm sorry if "gene markers" is not the correct word. An edit could be appreciated but I don't study in an English speaking country unfortunately. Question overview: In a family, there is a genetic, ...
2
votes
2answers
31 views

Help reading chromatogram

A genetic variation is found in this chromatogram: It says that the "reference sequence" is the top line and that I can use the general genetic code to find the reading frame. I can see that there ...
2
votes
2answers
35 views

Does the biosphere have infinite resources and are they infinitely renewable?

Does biomass represent all of the resources of the biosphere and therefore it would be theoretically infinitely renewable (as long as we have the sun) since all the biomass is part of the carbon ...
4
votes
1answer
45 views

Do non-enzyme catalysed reaction pathways exist?

Can their be a kind of chemical reaction pathway in a cell, that is catalyzed or regulated but NOT necessarily by enzymes? I could not find anything on Google. I have almost no background in biology, ...
4
votes
1answer
32 views

blue/white screening - results are opposite as expected

We inserted GFP-gene into plasmid Bluescript SK+, transformed E. coli with this construct, and then plated on an agar plate with Ampicillin and X-gal to do a blue/white screening. We got blue colonies ...
-5
votes
1answer
34 views

Questions with respect to a link [on hold]

With respect to this compound: http://www.kegg.jp/dbget-bin/www_bget?C00062 1. Is this a protein? 2. Does this compound have a pH or a pKa value? 3. If it does have a pH value then where can I find ...
11
votes
1answer
398 views

What is the magnification necessary to see pond life

My daughter is 5 and wants to learn about Biology. I thought a great start is to see life from pond water through a USB microscope. It would be great if she could see organisms like amoebas, ...
2
votes
1answer
30 views

What does it mean when a protein has a different excitation spectra than wildtype, but the same emission spectra?

We have a GFP mutant that displays a different excitation spectra with emission at 510nm than the WT. However, their emission profiles with excitation at 490nm are the same, and we do not observe the ...
0
votes
0answers
24 views

Why would cancer cells want to use this downstream Ras pathway to inhibit GSK-3B? [closed]

GSK-3B causes targeting of B-catenin and cyclin D1 for destruction; therefore, the function of GSK-3B limits cell growth and proliferation. In Ras downstream pathway, activation of PI3K phosphorylates ...
4
votes
2answers
54 views

Does DNA polymerase always go the same direction?

I read that mutations are more likely to occur on "the strand that DNA polymerase replicates discontinuously". Does DNA polymerase always go replicate the same strand discontinuously, and if so, ...
5
votes
1answer
49 views

Do we instinctially interpret birdsongs as a sign that there are no predators present?

I was outside today thinking how nice it was to hear the birds back from winter when I started thinking about the fact that we like bird song. It makes us happy in a very basic level, the sort of ...
3
votes
1answer
42 views

Why do spiders make their web near the ceiling and near a light source?

Why do spiders make their webs near the ceiling and near light sources ? Is their an advantage for spiders in doing that? For example do they catch more insects when their web is near a light source ...
3
votes
1answer
34 views

Applying kiwis on gelatin

Kiwis have the enzyme actinidain. This enzyme will break the peptide bonds from the gelatin. Making gelatin with raw kiwis will not work, because the peptide bonds in the gelatin will be broken down. ...
4
votes
1answer
77 views

Help me identify this insect

Over the last week or so as warmer weather has arrived, I've noticed small insects crawling around in the bathroom. I'm located in western Europe. They are perhaps 1mm in length, quite difficult to ...
1
vote
0answers
10 views

OCT-1 transport in Enterocytes

Does Oct-1 transport lactate or any of its products and in which direction (intracellularly to extracellular, the opposite, or inter-nuclear). The literature talks about Oct-1's role in neuronal ...
2
votes
1answer
36 views

Why are clementines easier to peel than oranges?

In my experience, clementines have been significantly easier to peel by hand than and orange. The skin of the orange seems to cling to the rest of the orange much more so than the skin of the ...
5
votes
1answer
66 views

How does the brain cool itself?

Thoughout life everyone tells you that brain is essentially a computer but just like computers your brain would create immense amounts of heat by being in use, so if that's the case how does it cool ...
2
votes
1answer
36 views

“bead” on a string theory of genetics, source?

Thomas Hunt Morgan was a pioneer in genetics and proposed the now false model of genes being "beads" on a string. These beads being indivisible and responsible for a single phenotype, if I understand ...
4
votes
0answers
37 views

Why do we get tired

At the end of a day full of work, it is general for people that their eyelids start to feel heavy. Laziness takes over and we begin to yawn. We all know that we're tired at that time, but why people ...
1
vote
1answer
29 views

What are the factors on which protein-protein interaction depend? [on hold]

Does protein-protein interaction only happens when one of them is basic and the other acidic? Do protein interactions also depend on the protein structure? Are there more factors?
3
votes
1answer
25 views

DNA length and annealing kinetics

I have a mixture plasmids and undesired short linear fragments that share the same sequences. During denaturation and annealing, I would like the plasmids to 'find each other' before annealing to the ...
2
votes
1answer
40 views

If oxygen deficiency is bad even for a short while, why do people swim?

This may be trivia to many of you. Textbook says the oxygen deficiency, even for a short while can injure our cells. Then why do people go for sports like swimming? (where rhythmic breathing is ...
0
votes
0answers
12 views

Cell energy consumption and food intake

I am wondering if each cell in human body starts consuming ten percent more energy, how much food one has to consume compared to normal intake?
1
vote
0answers
25 views

If I fall into a pond with an algal bloom, could I die from the cyanotoxins? [closed]

Suppose I fell into a pond with an algal bloom, and swam in it for a bit, but did not ingest any of the pond water (this is a hypothetical btw). Some algal blooms are harmful, containing natural ...

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