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
150 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.
15
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
137 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 ...
3
votes
1answer
84 views

How likely is it that a person's progeny has an inheritable disorder based on this pedigree?

Case study: A person (let's just call him "John") had 3 aunts that died back in the 1950's in early childhood due to an unknown form of neuromuscular disorder. One died at birth, one at 2 years and ...
3
votes
2answers
71 views

Why does azithromycin not affect human mitochondria?

Drugs like tetracyclines, macrolides and aminoglycosides bind to prokaryotic ribosomes. It is interesting that our body too having mitochondria, which have prokaryotic ribosomes, there is little(?) ...
1
vote
1answer
50 views

Use of western blotting

I ran across this paper recently. http://www.ncbi.nlm.nih.gov/pubmed/21151122 I am confused on their use of Western blotting. Their unmodified protein (no PTM group) has a band and their modified ...
2
votes
1answer
14 views

Partial pressure of gases in alveoli

Atmosphere has partial pressure of oxygen as 160mmHg but it's 105mmHg in alveoli, and the partial pressure of carbon dioxide in atmosphere is 0.3mmHg but it's 40mmHg in alveoli. How is the difference ...
0
votes
0answers
16 views

Does prokaryotic transcription have activators / enhancer regions involved?

I am designing a biosensor, and I need to know whether prokaryotic transcription involves or can involve (if a gene needs to be regulated) enhancer regions. Also, where are enhancer regions located (...
1
vote
0answers
30 views

How does DNA organise a cell's physical position within a body?

How do cells "know" where they are supposed to be in relation to other cells, in forming the physical shape of the body? If you have ever tried to organise or choreograph the physical positions of a ...
1
vote
1answer
89 views

Can a chicken really be hatched outside of the egg?

This YouTube video (screenshots attached) claims to show Japanese schoolchildren breaking an egg into a kind of clingfilm "hammock in a cup", and then growing and hatching a chick from it in an ...
0
votes
1answer
38 views

Previously frozen papaya seeds sprouted. How will it affect the plants?

I thought about asking this on Gardening SE, but it seems to me as a technical subject which requires biological expertise to answer. This is not something that usually occurs for gardeners, so I don'...
0
votes
0answers
39 views

Identify this cocoon worm

I couldn't identify which species these belong to. I believe its a larvae of an insect. They measure approximately 5 to 10mm in length. These are common in the southern states of India. They carry a ...
1
vote
1answer
66 views

What is the “transcriptome” in layman's term?

I am new to the bioinformatics field and am trying to understand a research paper that includes some definitions which I looked up on the internet, but couldn't find the proper definition of following:...
0
votes
1answer
40 views

Taking care of Birds: Unwanted species scaring away a less common one from a birdhouse

Near my house, I have set up a birdhouse, which has become home to a pair of Oriental Magpie Robins. They are not a common species in Delhi, India, and are generally shy of human interaction and avian ...
-2
votes
1answer
50 views

Can we infect with “bad” genes other organisms? [closed]

We know that some organism's DNA stay with human for life (Herpes) and we also can, i think, design such "gene" that can interact with human's DNA-polymerase very intensive. If we attached this gene ...
0
votes
0answers
24 views

fluid used in replacing blood for oxygen, carbon dioxide exchange during major surgical operation

Are there fluid alternatives that can be used in replacing blood for oxygen, carbon dioxide exchange during major surgical operation?
5
votes
2answers
85 views

Bee identification

Can anyone help identify this UK bee? The picture was taken in June 2016. Doesn't have to be exact, really just want to know if it's a honey bee or a solitary bee. Thanks.
2
votes
1answer
26 views

If targeting a certain daily water intake, do you have to compensate for beverages that promote diuresis?

Please forgive my ignorance on the topic and I hope this is a "on topic" question here. It was a toss up between this SE and Physical Fitness SE but I want a more scientific answer. I came at a ...
0
votes
2answers
33 views

Does denaturing proteins lead to loss of epitopes?

I am doing an experiment where I have to do both Immunohistochemistry and SDS-PAGE. I am assuming that the native conformation of the protein is maintained in the IHC. But during the blot, we heat the ...
1
vote
1answer
30 views

What can saliva tell about ones health? [closed]

I was wondering if I d want to analyze something related to my current health based on my saliva. What could it be? I mean e.g. by putting a thermometer in your mouth you can know your body ...
4
votes
1answer
79 views

Is there a biological explanation for perceived deeper cognition whilst on cannabis?

Cannabis has been associated with literature, arts, and culture for centuries. There are a few features of the drugs affect on the human mind that account for this, however it remains illegal in most ...
3
votes
1answer
44 views

Species Identification: Coniferous tree, Italy

I noticed it close to the place where I work, I live in Italy Could you tell me the complete name of this tree? Particular of the leaves
2
votes
1answer
49 views

Why does the wavelength in curly hair differ?

Different people and animals have different wavelengths in the curls in their hair. I understand what purposes hair serves in protecting the skin from light and bugs. I am wondering about the eventual ...
3
votes
1answer
131 views

how to quantify toxicity

When going through this link, Table 1, what are the numbers mentioned there? How is one quantifying toxicity?
1
vote
0answers
30 views

Question related to pathogen population [closed]

Does only one pathogen of one species enter the host and cause harm to the host or is a certain number of pathogen populations of the same species needed inside the host to disrupt the functionality ...
0
votes
0answers
8 views

Can the salinity level in human blood be altered by diet?

My question is regarding is it possible to control the salinity levels in a human blood system by diet. I understand how salt works in the blood and just want to know if it can be controlled.
3
votes
0answers
26 views

Validity of measurements of respiration in isolated mitochondria

I've recently read a couple of papers on exercise and mitochondria, in which state 4 and state 3 respiration rates and ROS production are assessed in vitro after exercise has been performed (i.e., rat ...
5
votes
2answers
80 views

Relationship between lifespan and reproductive age?

I remember reading a while ago that there is a "general rule" in biology between an animals lifespan and when they reach reproductive age. In other words, an organism that reaches sexual maturity ...
0
votes
0answers
11 views

Does alcohol affect water potential across a tonoplast? If so, would it cause it to explode or implode?

This was a question I saw in a biology exam I recently sat. I know it affects the r-groups of the transport proteins, causing them to change shape and become leaky, but does it also affect water ...
2
votes
0answers
40 views

Has a restriction enzyme ever been tagged?

As part of an experiment that I am preparing, it would seem necessary for me to tag a restriction enzyme (HaeIII to be exact) with GFP. I began researching its domains to determine whether to tag the ...
0
votes
2answers
63 views

Are heterozygotes always fitter than homozygotes? Can inbreeding be beneficial?

Inbreeding is mostly not very good because when there is a 'disease' in one allele, the other could/would take over the function. But when you have two of the same genes/alleles, do they, or could ...
0
votes
0answers
59 views

Why do horses recycle their endometrial lining while humans don't?

How does not recycling the endometrial lining of the uterus benefit humans (and other organisms that menstruate), while recycling it is beneficial to horses (and other organisms that undergo estrus ...
3
votes
2answers
91 views

Can animals also get Down syndrome?

I heard that animals cannot get Down syndrome or trisomy. Is that true and why can't they get it? They also have chromosomes.
2
votes
0answers
17 views

What is the evidence that mammals are unable to process excess sodium chloride?

I grew up hearing the mantra excess salt causes heart disease I had a vague understanding that it caused deposits in the body or something. Now that I give it more thought - I come up with three ...

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