1
vote
3answers
35 views

Where does the term “cos site” come from?

The word cosmid is derived from cos sites of lambda phages. Why are cos sites called cos sites? What does this "cos" refer to?
0
votes
0answers
10 views

Are there examples of abnormal human chromosomes that can cause diseases? [on hold]

I was looking into chromosomes and I found the chromosomal abnormalities. I have a limited understanding but I was wondering if someone could clarify it? I was also wondering what numerical, genetic, ...
0
votes
1answer
6 views

Do we digest in our mouth? [duplicate]

whenever I feel a little light headed or tired it helps to eat something sweet. The interesting part is, that it often take only seconds until the sugar seems to kick in. So i was wondering whether ...
2
votes
2answers
57 views

What are the “minimum requirements” for a single cell?

I saw a description of the "minimum requirements" for a cell at http://creation.com/origin-of-life in the section called "What are the minimum requirements for a cell to live?" and I'm wondering if ...
0
votes
1answer
8 views

Is missing Q wave characteristic for Wolff-Parkinson-White Syndrome?

No my study books says about that no Q waves in WPW syndrome. They are about wide QRS complex often however. I heard today that the characteristic property of WPW is often a missing Q wave, like here ...
2
votes
1answer
49 views

Why is it important to study chromatin to understand cancer?

Many labs and many projects in biology institutes and university departments have been starting to study chromatin. Chromatin states, chromatin interactions, chromatin loopings, chromatin behaviours, ...
6
votes
1answer
76 views

Is Batesian mimicry more important for females?

Myrmarachne plataleoides is a jumping spider that mimics the Kerengga or weaver ant (Oecophylla smaragdina) in both morphology and behaviour. However, the two sexes appear different: Myrmarachne ...
1
vote
1answer
28 views

Evolution and Phenotypes.

This may be better suited for the English language SE, but When discussing evolutionary changes in species is it proper to refer to their phenotypes? In this context: "Imagine if a cow did not ...
-3
votes
1answer
49 views

What is the biological process shown in this textbook cover? [on hold]

So I've been with this question to a number of forums and I can't seem to get any head start with it. I have this textbook called "The World of The Cell" 7th ed. On its cover is a picture that is ...
8
votes
3answers
830 views

Are blood vessels organs?

Are blood vessels classified as organs? Organs compose of 2 or more tissues and perform a certain function. Blood vessels have 3 different tissues and perform a function (transport blood), yet I do ...
2
votes
1answer
16 views

Why does the inhibition of translation initiation cause the accumulation of 80S ribosomal monosomes?

As I have read in (1), inhibition of translation initiation will increase the number of 80S ribosomes while decreasing the fraction of polysomes due to the polysome-runoff. The net effect is to ...
1
vote
1answer
24 views

What is the connection between exercise and muscle growth

From a physiological perspective, all that is done during exercise is the expending of energy in the form of ATP to fuel muscle contraction and extension. When I looked up why muscle grow due to ...
-8
votes
0answers
34 views

Why do we have buttocks at the back and not in the front? [on hold]

We have buttocks at the back and not in the front. Why? edit: I mean, why is gluteus maximus bigger than inner hip flexor?
5
votes
1answer
24 views

Can a woman possessing 1 mutated allele show attenuated color-vision deficiency?

Women possess two X chromosomes. However, during development, when the embryo has about 32 - 64 cells, one of these chromosomes is randomly inactivated (in each cell) by a lncRNA named Xist. As a ...
-1
votes
0answers
24 views

Can we generate an antigen to make a mosquito impotent? [on hold]

Can we create an antigen for human beings such that when a mosquito bites us, the antigen makes the mosquito impotent? So it will make the mosquito unable to reproduce. If every person has this ...
6
votes
3answers
348 views

Does a neuron ever generate an action potential without stimuli?

Most accounts I read involving action potentials and synapses and the like tend to focus mostly on the action potential as a mere automatic reaction to another similar event happening upstream. From ...
10
votes
1answer
624 views

Have there been studies done to test Immortality of cancer cells in culture?

This website on cultured cancer cells () says cancer cells may be immortal. I am wondering if there has been any research done to find if cancer cells are really immortal. How old is the still ...
3
votes
1answer
78 views

Oscillatory electrical system using a chain of neurons

Many daily activities that we perform are result of inbuilt oscillatory circuits in our body. For example walking, breathing, heart beat, blinking, etc. The coding and decoding of stored memory also ...
8
votes
1answer
88 views

Can people with paralyzed eye muscles see?

As far as I am aware, the saccades of the eye are central to visual perception. If the eye is held still, the human stops seeing, even if light is reaching the retina and the visual pathway is intact. ...
3
votes
1answer
42 views

How do bumblebees and hornets avoid the negative effects of inbreeding?

I just learned that all hornets and bumblebees except for the queen die at the end of the year and the queen starts a new nest in spring. But that means the next generation of queens have only ...
0
votes
0answers
10 views
3
votes
0answers
38 views

When and How do pacemaker cells develop during the cell aggregation process of Dictyostelium discoideum?

I was reading a paper by Tang & Othmer about oscillations and waves in Dictyostelium discoideum. Under certain condition like starvation period in the life cycle of a Dictyostelium discoideum ...
2
votes
0answers
29 views
+50

Degree of dosage compensation in Drosophila melanogaster

In this paper the authors state that the dosage compensation seen in Drosophila is approximately twofold, but they do not provide any source or numbers (as far as I can see) for this. What is the mean ...
1
vote
0answers
38 views

Why my right eye see warmer colors? [on hold]

As the title says, my right eye see warmer color than the left one. I've seen a few people talking about that thanks to google, but I was unable to find a proper answer. So, what cause this strange ...
0
votes
0answers
4 views

How the pattern of fertilization path is determined before the cell division to form the blastocyst? Is it individually specific?

After sperm meets ovum,the inactive nucleus starts following a particular path inside the zygote, kind of chasing a path. This path biologically known as fertilization path. But my question is how the ...
2
votes
6answers
124 views

Which information can be obtained from a list of gene names?

Lets say I only have a list of gene names. I know they are up regulated and I know they are related to cancer. What information can I obtain from having only the names of genes? For example is there ...
6
votes
1answer
48 views

Why are abiogenesis and evolution considered unrelated?

When a discussion about evolution comes across abiogenesis - the typical reaction is that they are unrelated (see the headline at http://www.factsnotfantasy.com/abiogenesis.php). It seems to be ...
2
votes
1answer
61 views

Which wavelength to use to determine algae using a colorimeter?

I am doing a Biology project involving the measurements of the density of algae (Nannochloropsis) using absorbance colorimetry. What wavelength should I set my colorimeter to? The issue is that there ...
2
votes
1answer
48 views

What would be required to evolve an animal (non-human) brain to obtain human-level cognition?

Could any animal subject to the right conditions evolve human-level intelligence? Suppose that an artificial intelligence (AI) decided to artificially evolve a population of octopus (don't ask why, ...
3
votes
1answer
47 views

Why can action potentials not be initiated at dendrites?

Why are action potentials not initiated at dendrites, although dendrites are the first to receive input from the presynaptic cell? In fact, excitatory postsynaptic potentials (EPSPs) at the dendrites ...
5
votes
1answer
48 views

What recovers normal polarisation after hyperpolarisation?

I have been taught that a Na+/K+ pump helps to recover normal polarisation after hyperpolarisation in neurons. I could not find out how it does that, since I've also been taught that such a pump moves ...
3
votes
2answers
46 views

Terminology for inefficacy of selection on recessive alleles

I am wondering is there some proper terminology which is used to say that deleterious recessive alleles might be able to hide, reducing the the efficacy of selection, in diploid organisms/chromosomes. ...
2
votes
0answers
24 views

External sensory stimuli that awaken a person from sleep

An external sound or touch can awaken someone. Can a light? It would have to be very strong, but part of the reason might be that it would have to penetrate the eyelids. And can a smell or taste? ...
4
votes
0answers
16 views

Is it possible that the vapour form of propylene glycol could lower a humans blood oxygen saturation by the manner in which N2O does?

My understanding is that by inhaling nitrous oxide leads to the body not being able to take in as much oxygen as it usually would. Is it possible that a heavier soluble gas such as the vapour form of ...
1
vote
0answers
16 views

planting conifers in a sagebrush area [on hold]

I'm looking at buying some property in the picture below. You can see the conifers (mainly Jefferson Pine and Lodgepole Pine) as the dark green dots on the outside frame. The intersecting line (top to ...
2
votes
1answer
42 views

Which sources can I use to study botany and horticulture?

I refer with this question to those among you who have a strong background and work in fields like: botanics, horticulture, dendrology, etc. I would like to start building a solid preparation, both ...
2
votes
1answer
54 views

About validation process of phenological study

I have recently done a phenological study using remote sensing techniques. Now I need to validate my results and my methods, that is, to determine if the phenology estimated from remote sensing is ...
12
votes
2answers
1k views

The Uniqueness of DNA Paradox

How can everyone have unique iris and fingerprints? After a certain amount of human beings have lived on earth, wouldn't it be possible to exhaust all possible combinations? The same principle ...
4
votes
2answers
278 views

What determines the autumn leaf color?

It is autumn out there. Green, brown, red, yellow, and mixed-colored leaves drop from the trees to the ground. What determines the colors of the leaves? Wikipedia tells me Leaf senescence is the ...
3
votes
3answers
50 views

Can systemic intravascular thrombosis cause brain infarction?

I wonder if the thrombus can pass through the brain-blood barrier because I think small molecules like O2, CO2 and ethanol can pass it. Probably, in some diseases where the permeability of the barrier ...
6
votes
2answers
371 views

How sterile is sterile when working with nucleic acids to prevent contamination?

I am reading up on preparatory work on working with nucleic acids and a lot of the instructions speak on excessive procedures on cleaning environments with high %ethanol and making sure the equipment ...
7
votes
3answers
50 views

Current along an axon

When an action potential is induced on a neuron, the local transmembrane potential jumps from $E_{\mbox{rest}}$, the resting potential of the neuron, to $E_{\mbox{eq}}$, the equilibrium potential of ...
3
votes
1answer
17 views

How exactly is glyceraldehyde 3-Phosphate reverted to ribulose 1,5-bisphosphate for the continuation of the calvin cycle?

Around 6 molecules of G3P is produced at the end of the Calvin Cycle (light independent reactions of photosynthesis), and 5 of which are reverted back to RuBp. The general equation that I read is 5 ...
0
votes
1answer
37 views

Does “mind” has any physical reality in biology? Or is it just an assumptive concept?

Biologically, Brain controls our thinking, ideas, decisions everything along with controlling each body parts. My question is, is there anything real as "mind "? If it's controlled by brain then ...
4
votes
1answer
45 views

Relationship between toxicity of drugs and negative effects on brain

Are psychoactive drugs with lower lethal doses more neurotoxic (more damaging to the brain)? For example, tetrahydrocannabinol (one of the active components of cannabis) has a much higher lethal dose ...
2
votes
1answer
10 views

Do I have to use sucrose to induce a lac promotor?

I'd like to optimize the expression of a Fab fragment in Escherichia coli. For induction of the lac promotor on the pAK400 vector I use IPTG and sucrose. Do I optimize the expression in case I would ...
3
votes
0answers
22 views

What would the blood work look like for someone on a very high protein diet? [on hold]

What will blood test results look like for someone on a very high protein diet consuming 1-2g of protein per pound of bodyweight per day? Is it healthy to maintain such a diet?
2
votes
2answers
3k views

Is episome a plasmid or a virus?

A plasmid is a small DNA molecule that is physically separate from, and can replicate independently of, chromosomal DNA within a cell. In general, in eukaryotes, episomes are closed circular DNA ...
2
votes
0answers
8 views

Is the blastocyst a coeloblastula?

A coeloblastula is that type of blastula which has a fluid filled cavity. Since the blastocyst of the mammals does too, can it be called a coeloblastula? My book however mentions the two as different, ...
4
votes
2answers
116 views

Do animals exist which have great vision, but see only grayscale?

In computer vision the color information is often discarded, as most object recognition tasks seem to work just as well on the greyscale image (even better, because there is less unnecessary ...

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