3
votes
2answers
151 views

What is correct MVM vs. MMV?

I'm writing up a report and I see conflicts everywhere on the internet. Should it be Murine Minute Virus (MMV) or Minute Virus of Mice (MVM). The followup question is does it really matter.
3
votes
1answer
42 views

Forensic genetics- why is mtDNA comparison sometimes better than nDNA comparison?

Why is (in forensic genetics) in some cases more appropriate comparison of nuclear DNA but in some other cases comparison of mitochondrial DNA? Is it because geneticists are sometimes unable to find ...
2
votes
1answer
31 views

Is there any alternative to cryopreserve cell lines without -80 freezer?

My university's -80 freezer just broke down and the repair will take 4 months according to the vendor. Is there any other way to preserve cells? Maintaining lot of flasks until the freezer is repaired ...
6
votes
1answer
322 views

Why is it harder to sequence plant genomes than animal genomes?

Plants seem to be less complex organisms than animals, but despite that there are less plant genomes sequenced. Is that because plant genomes are more complex, for example in terms of regulatory ...
7
votes
1answer
495 views

Why does the membrane of a neuron not stay at its depolarized state?

When an action potential is transmitted along the axon, the membrane reaches its depolarized state by opening Na+ channels. Both K+ (potassium) and Na+ (sodium) are now on both sides with close to ...
15
votes
2answers
328 views

Are there single-celled organisms that have evolved from multi-cellular ones?

I'm reading this paper about transmissible cancer cells in clams (Metzger et al. 2015) and I was wondering if there are any single-cellular organisms that are around today that are suspected as having ...
0
votes
2answers
66 views

Hopeful Monsters in Plants? [closed]

Does anyone know of any research/examples on Hopeful Monsters in Plants? I define Hopeful Monsters as organisms of a species that have macroevolutions to prompt new speciations. These ...
6
votes
1answer
113 views

Who are these biologists?

I know the third one in the front row is James Watson. Does anyone recognize the others?
7
votes
2answers
344 views

What is this bug?

I recorded a video of this bug: https://youtu.be/0eoWfHLEo7A I counted 8 legs, the front legs are a little curved. The drawing on the flat back is dark and looks like the image of Jesus with some ...
5
votes
0answers
109 views

SDS Laemmli Gel that did not solidify [closed]

In my lab class this week my partner and I were making a SDS-PAGE Laemmli Gel. We made the resolving gel solution which was made of 30% Acrylamide, DI water, 1.5 M Tris-HCL pH8.8, and 20% SDS. We ...
7
votes
1answer
109 views

Neuronal coordinates of C.elegans

Is there a list of neural coordinates for C.elegans? I need it to build a 3D model. Update: What is available at the moment is: full connectome for example, at openconnectome; neuron description ...
6
votes
2answers
156 views

What is the mechanism behind plants losing their leaves? [duplicate]

Do plants that lose their leaves (i.e., deciduous plants) do so because of external conditions (e.g., drought, cold), or because of an internal process? Another way of looking at it: if you take a ...
2
votes
1answer
25 views

Are Sciomyzidae fit to combat snails?

I read that Sciomyzidae are also called snail-killing flies, which immediateley made me think: "I need those"! Questions: Are they really fit to control snail over-population in my garden? and if ...
3
votes
1answer
75 views

Why are pharmacology studies so experimental?

I am a med student, and as far as I see from our pharmacology lectures, pharmacologists work almost completely experimental. Quite typically they take a substance (e.g., from nature), they add, change ...
8
votes
1answer
112 views

Do ant colonies prioritize survival of particular members above others?

In some (perhaps small) human communities people may starve because they have no income. This could be interpreted as a consequence of them not participating in the community, hence they don't get any ...
2
votes
1answer
856 views

Green Film Build up in Glass Water Bottle

So I have this Large Water Jug that I fill only water with. And this is the 2nd time there has been a layer of green film that builds up at the bottom of the bottle. I don't have any way of getting ...
7
votes
1answer
85 views

Do blood glucose “spikes” contribute to insulin resistance, or is prolonged elevation required?

There's increasing public discussion about the health risks of chronic insulin resistance* (IR). In many cases there's a focus on high glycemic index foods that "spike" your blood sugar, which implies ...
2
votes
1answer
31 views

Term for a leaf in a family tree

Imagine a family pedigree. Mathematically it is a graph, which consists of nodes and edges. Nodes being family members, and edges - their relationships. In a clinical setting, what is the proper ...
1
vote
0answers
15 views

What are phenetic analyses used for?

Phenetics (grouping of organisms based on similarity) used to be claimed to be an alternative to cladistics, but now it is widely accepted that phenetic analyses cannot be used to infer evolutionary ...
5
votes
3answers
188 views

Can we knock out Caspase-9 *and* avoid breast cancer phenotype in our mouse model?

I am trying to design a wet lab experiment with no wet lab experience to name. Right now, in my dream land, it would be excellent if it were possible to create a Caspase-9 knockout mouse (damage to ...
3
votes
1answer
331 views

What is the difference between “physical interaction” and “genetic interaction”?

I searched sac1 in uniprot to know more about this gene. in interaction I selected this link and there I see that this gene has some "physical interactions" and "genetic interactions". I am wondering ...
4
votes
1answer
40 views

Does hypothalamus regulate posterior pituitary gland?

We have the hypothalamus-anterior pituitary-endocrine axis, but is there a similar chain of command for posterior pituitary gland such that oxycotin and vasopressin are regulated by some tropic ...
0
votes
2answers
942 views

Heterocyst function in cyanobacteria and its localization

1.What is the function of heterocyst? 2.Where it is present? A heterocyst I think may be a protecting organ in cells!
1
vote
0answers
42 views

from an ageing reproductive stem cell's DNA to baby's “brand new” somatic cells' DNA

On the one hand, somatic cells's DNA age as life goes on, mitosis after mitosis, and that is reflected into reduced telomeres. On the other hand, during life, reproductive stem cells must age too. ...
5
votes
3answers
137 views

What does it mean for a hormone to be “active”

In my textbook it is stated that the T3 hormone produced at the thyroid gland is 3-5 times more biologically active than T4. How is being active defined and how can this effect be measured?
3
votes
1answer
117 views

Microalgae without cell walls?

Most microalgae have rigid cell walls. Dunaliella Salina is a pretty famous example of an algae with no cell wall, but just a plasma membrane. Are there any other microalgae without a cell wall?. I ...
2
votes
1answer
80 views

What is the insight of Frank Starling law of the heart?

The Frank Starling law appears to be a trivial observation: stroke volume is directly related to the end diastolic volume In everyday language, as more blood fills the heart, the heart pumps more ...
11
votes
1answer
276 views

Why are people unable to develop lasting immunity against Norovirus?

Infection with many viruses will result in decades-long if not lifetime immunity, for example chicken pox. Because of the large number of viruses responsible for the common cold, lifelong immunity to ...
2
votes
0answers
285 views

Can a person's body produce enough electricity to break a wristwatch? [closed]

I know of someone who cannot seem to wear watches without the battery dying or something else about the watch going haywire. this person was told it is because their body is producing too much ...
1
vote
1answer
4k views

How is ATP involved in muscle contraction?

The sliding filament mechanism as explained by my text does not elaborate on how ATP is involved in the cross bridge binding and contraction process. How does muscle contraction utilize ATP? In my ...
0
votes
1answer
309 views

What is a complex?

In my text book it says that "Troponin" is a complex of Troponin C, I and T. In this sense, what is the relation between Troponin complex and C, I, T?
2
votes
1answer
90 views

Retrovirus Production

I have been having difficulties with low transduction efficiencies of my retrovirus production. I expand my plasmid of interest (on MiG-GFP plasmid) in DH5α E Coli for ~24 hours, purify with Qiagen ...
1
vote
2answers
151 views

What's the proton concentration around a DNA helix?

Let's suppose the concentration of a 20-nt DNA strand is $10^{-4}$M and the solution does not contain any salt ions. In a solution with pH 7, $[H^+]=10^{-7}$M, on average each DNA has only 0.001 ...
6
votes
1answer
163 views

Why is there smooth muscle in our bronchioles?

Having muscle tissue in our bronchioles that can constrict seems like a poor choice for tissue. Why would our airway want to ever close up? Wouldn't it be more beneficial for our bronchioles to just ...
3
votes
2answers
261 views

Could an action potential produce few or more neurotransmitters based on the stimulus received?

I reckon that if you would be able to widen the AP width, it would produce more neurotransmitters in that larger time interval. Is that correct? Or does the neuron have a standard amount of ...
3
votes
1answer
124 views

What governs the distribution of blood vessels?

Whenever someone is sick, doctor places 2 fingers on wrist & observes the heart-beat-rate by feeling pulses of a certain artery. To me it seems the distribution of blood vessels are pretty ...
5
votes
1answer
49 views

How can the phenotypic effects of a tumor suppressor mutation be silenced?

I've been reading a little about the "two-hit" hypothesis for tumor suppressor genes here, which mentions that some genes exhibiting haploinsufficiency are exceptions to the hypothesis. I've read ...
8
votes
1answer
223 views

What is this mushroom?

I found a singular mushroom in my back yard, It is jet black, seems to have gills and looks somewhat like a flower do to it's upturned-ness. Sorry for not having spore colors, but I didn't want to ...
3
votes
1answer
88 views

Can yeast in a primary fermentation of wine be used as a source of yeast for new fermentation?

So if I were to pitch bread yeast, and get to primary fermentation, which as I understand it, is the point at which regular cellular respiration can no longer continue due to a lack of oxygen , which ...
0
votes
1answer
145 views

How to tell if a given gene is a tumor suppressor or oncogene?

This is a problem taken from "Concepts of Genetics", Klug et al, 10e. I'm given the following table about the mutations in the BRCA1 gene: $$\begin{array}{c|c|c|c|c} \text{Kindred}&\text{Codon}&...
3
votes
1answer
158 views

Before Evolution was proposed by Charles Darwin, what were the leading secular theories to explain how life developed? [closed]

Outside of evolution, what were the leading scientific schools of thought that Charles Darwin contented with when he published his evolution theory as way of natural selection in 1859?
1
vote
1answer
95 views

Do muscles still hold glycogen reserves if there is no carbohydrate input

Afaik skeletal muscles take glucose from the blood to store it localy as glycogen, to be used in the case of intensive exercise. Does this still happen if the calorie input is exclusively made up ...
0
votes
1answer
124 views

Why should or shouldn't we allow the human body to take its natural course? [closed]

For example, when you are sick but don't feel thirsty, this could be due to baroreceptor reflex that is attempting to readjust salt and water balancing. Why shouldn't a patient be left thirsty and ...
0
votes
1answer
53 views

What causes a small bump in the arterial pressure plot?

In my book there is a plot of the arterial pressure against time. From the plot, during heart contraction, there is greater pressure on the artery and during heart relaxation, there is lower amount ...
3
votes
3answers
562 views

Why are there no trees in Texas?

In Texas, there is lot of grassland and many cotton fields, which need a great deal of water. However, I have not seen any forests or areas with many trees. Why are there no forests or heavily-treed ...
2
votes
1answer
261 views

How to isolate host cell RNA (tRNA,mRNA,rRNA) from viral RNA?

A retrovirus with RNA genome infected a host cell. You would like to isolate the host cell’s RNA (rRNA, tRNA, and mRNA) from the virus RNA. What properties can you rely on to determine the three types ...
14
votes
1answer
1k views

Why do mushrooms grow in rings (sometimes called “Fairy Rings”)?

Mushrooms disperse their spore in all direction. Then why is there a formation of fairy rings? Why do they grow in one shape and not randomly?
1
vote
2answers
140 views

Mosquito physics

What are the environmental limitations of mosquitos I should know of if I want to avoid getting bitten? For example: How fast should I walk in order to be moving too fast for one to bite me? Can a ...
2
votes
0answers
220 views

Why do body parts sometimes get a itching and tingling feeling when falling asleep?

Just before I fall asleep I sometimes experience an itchy and stinging feeling in my body parts. It can be that the nose or neck suddenly start to itch or a tingling stinging feeling in the legs. ...
1
vote
0answers
33 views

Regarding cryonics, why can't you freeze a living body and then thaw it later, fully functional?

Cryonics is very popular in science fiction today, as a method of preserving animals, including humans, for long time storage and thawing the tissue later in the future. What is the difficulties with ...

15 30 50 per page