1
vote
2answers
61 views

Can a small polypeptide fold over itself and have a tertiary structure?

What I want to know is if polypeptides (those which are not considered as proteins) can also "exhibit" a tertiary structure.
2
votes
0answers
22 views

Can the respiratory quotient be calculated from a formula or must it be measured directly?

I found the following question on the Respiratory quotient: A normal human diet has a Respiratory quotient (RQ) of approximately 0.85. Given that pure oxidation of fatty acids has a Respiratory ...
3
votes
0answers
25 views

What is the effective population size of a simple two deme metapopulation?

I am confused as to how to compute the effective population size $N_e$ of a theoretical structured population. Let's consider here a simple case study. Imagine a 2-deme metapopulation. Each deme is ...
3
votes
2answers
48 views

Age-Dependent STD Infection

It seems that young females (comparing age 15 vs age 24) are 20x more likely to get chlamydia from a single unprotected sexual encounter with an infected male. What are the reasons for this? Are ...
0
votes
0answers
17 views

Do Tumor-Infiltrating T Cells Experience Any Prolonged Effects Due To Hypoxia After They Return To Normoxia?

Adoptive cell transfer (ACT) therapy using tumor-inflitrating lymphocytes (TIL) is at the cutting edge of immuno-oncology treatments involving metastatic melanoma and other indications (1). The idea ...
3
votes
0answers
20 views

Phase Transitions of Purified Proteins

Why do solutions of purified protein condense into droplet phases? I'm trying to understand the protein phase transitions. Here is the article http://www.cell.com/cell/fulltext/S0092-8674(12)00634-4#...
0
votes
0answers
15 views

Lymph nodes Vs Lymph masses

what is the difference between lymph nodes and lymph masses as both have lymphocytes so I think ambiguously that they are same? If so, why different terms are used for them?
2
votes
3answers
74 views

How valid is the theory of human's chimp-pig origin? [closed]

Edit: I have also asked the question on skeptics.stackexchange.com and it has been answered there. Here is the link. There is a person called Dr. Eugene McCarthy who has a theory that the origin of ...
0
votes
0answers
43 views

Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
3
votes
1answer
58 views

Can a color-blind person see color with filter glasses? [closed]

Why does color vision improve in color-blind persons using these filter glasses from Enchroma? Will a color blind person be able to see the same colors on a television? I'm asking, because the colors ...
1
vote
0answers
29 views

After a bacterial infection is dealt with, do any of that colony of bacteria remain?

Suppose that I get a bacterial infection, which my immune system deals with. Are there any remnant bacteria, or are they all gone? Now consider the same scenario, but having been treated with a full ...
4
votes
1answer
50 views

Do flowers transpire?

I have googled this out but no where found a satisfactory answer. The definition of transpiration states that it is the evaporative loss of water from the aerial surfaces of the plant but I am really ...
1
vote
0answers
31 views

Would a transparent iris serve its purpose?

The function of the iris is to regulate the aperture of the pupil. How does the iris obstruct light? Is it due to the pigment present in it? Or is it just due to the sheer presence of it? I am doing ...
1
vote
1answer
60 views

4DGenome or another comprehensive database of chromatin interactions

I'm searching for the most comprehensive source of chromatin interactions to support enhancer targets (data such like Hi-C, ChIA-PET, IM-PET, 5C, 4C, 3C, etc.) and my question according that could be ...
1
vote
0answers
22 views

Why does liver wrap around inferior vena cava?

As shown in the image, the liver wraps around inferior vena cava, which takes blood from liver via hepatic veins. Is there an advantage of having the inferior vena cava closer to the liver rather than ...
1
vote
1answer
36 views

A New Antiviral Drug Strategy?

I am studying viruses and I have a question about antiviral drug strategies. Why haven't researchers tried finding small molecule drugs that will bind to receptors on the host cell, thereby preventing ...
1
vote
2answers
85 views

Why do FSH and LH hormones drop in diagram when maturing follicle and does size of follicle change during menstruation phase

There are three phases in menstrual cycle. In follicular phase of menstrual cycle, the level of FSH and LH would rise because they would stimulate ovarian follicle to mature. However, when I check ...
3
votes
1answer
33 views

Is there more diversity in marine species?

I was reading about how life emerged from oceans, and the following question occured to me. Do land species suffer from the founder effect and is there more (genetic) diversity in marine species? A ...
0
votes
0answers
19 views

What does high level science actually say about the gay gene? [duplicate]

There is a lot of talk about genetics in the contemporary debate on the morality of homosexual behavior (and bisexual behavior, hereafter implied). As I understand the issue, the thought is not that ...
1
vote
2answers
64 views

Difference between water and tea [duplicate]

My friend heard that tea is worse for drinking than water because "cells have a special membrane and tea has special supplements and membrane doesn't let tea pass and this is why skin is dry even when ...
0
votes
1answer
100 views

Humans genetic/phylogenetic “next relative” in central Europe? [closed]

What species in central Europe in the phylogenetic tree shows the closest difference in time to the most recent common ancestor with Homo sapiens?
2
votes
1answer
476 views

I found this insect in Utah, USA. What is it?

I keep seeing this insect around my house. What is it? Here is another image:
4
votes
1answer
57 views

Trying to identify an insect

Toady a friend saw an insect in his garden, in the UK (England). It looks like a combination of a hover wasp, a wasp and a dragonfly. Whist flying, I'd describe it more similar to a dragonfly. I've ...
0
votes
1answer
25 views

What is the relationship between independent assortment and cross over?

During meiosis, the independent assortment will be made first and then cross over will be made. I am so confused, what is the difference between this two process? I looked at the diagram on internet....
4
votes
1answer
55 views

Does the formation of water inside the mitochondrial matrix help contribute to the proton gradient during the electron transport chain?

Does the synthesis of water in the final step of the electron transport chain significantly increase the electrochemical gradient across the matrix? I understand that pumping protons out of the matrix ...
0
votes
0answers
8 views

What steps need to be taken between a successfull SDSPage GE and MS/MS?

Once you have your gel with separated proteins can you simple cut out each band and plop it into solution or do you need to take extra steps?
14
votes
1answer
149 views

What's the mechanism for being mentally tired?

I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there just a ...
0
votes
1answer
32 views

Optical Density conversion to cfu / ml

I am having troubles understanding the correlation between OD measurements and CFU/ml. What is the conversion factor between the two units, and does this conversion factor somehow compensate for dead ...
1
vote
0answers
45 views

What types of species can produce genetically identical offspring? [closed]

Talking about identical twins, triplets, etc. I'm curious which types of species are able produce genetically identical offspring. Let's limit the scope to species that reproduce sexually and ...
0
votes
0answers
24 views

Shrews have the highest brain-to-body mass ratio of vertebrates. Also one of the few animals to menstruate. Coincidence? [closed]

Shrews have the highest brain-to-body mass ratio of vertebrates. Also one of the few animals to menstruate other than humans. Coincidence? Have any parallels been found between the small group of ...
0
votes
0answers
18 views

Why are there not bioluminescent plants? [duplicate]

There are bioluminescent animals and fungi, so why hasn't this ever evolved in plants? I imagine it would be good at attracting night pollinators.
14
votes
3answers
2k views

Why are turtles classified as reptiles and not amphibians?

I understand that turtles are reptiles because like all reptiles, they have scales on their body. But turtles (specifically sea turtles) live on both land and water, very much like amphibians. Also, ...
4
votes
1answer
71 views

Why can't we find a broad spectrum antiviral drug to viruses like antibiotics to bacteria?

Antibiotics have a very broad spectrum because they attack the metabolism pathways many bacteria share. For example, penicillin inhibits peptidoglycan synthesis, which is vital for formation of cell ...
1
vote
0answers
32 views

Why don't animals need filtered water? [duplicate]

Almost 10 years back when I was a kid, we had a picture in our school text of wild buffaloes drinking water from a river - which was visibly muddy. I asked my mother of why we need to drink filtered ...
0
votes
0answers
8 views

will 2,4 Dichlorophenoxy acetic acid be effective as an herbicide against banana and papaya

Since 2,4 D is effective against broad leaved weeds/plants, will it be effective in case of banana and papaya?
-1
votes
2answers
42 views

doubt with a multiple choice question [closed]

Permanent decrease in population would occur due to- A) Migration B) Natality C) Emigration D) Mortality E) Territoriality . It's obvious that C) & D) options are possible . But I'm confused ...
1
vote
1answer
50 views

What is an interaction motif with respect to protein sumoylation?

While am reading about protein sumoylation this morning I got stuck on sumo interaction motifs and consensus motif line. I heard the the word motifs for the first time. What does motifs mean in this ...
4
votes
4answers
136 views

The human has 46 double chromosomes or simple chromosomes?

What I mean: does the human cell have 46 of these: or 46 of these: Thank you in advance.
0
votes
0answers
19 views

Effects of pulverizing liquid nitrogen frozen tissue by by pestle and mortar

Does RNA, DNA or protein molecule break during pulverizing (liquid nitrogen) frozen tissue by pestle and mortar. As I want to make cDNA for qPCR, this is very important to me to know this.
0
votes
1answer
23 views

Enzymes and Reversibility of Reactions

Richard Feynman mentions in the third chapter of The Feynman Lectures: So the real system is in the GDP-GTP transformation; in the dark the GTP which has been stored up during the day is used to ...

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