3
votes
0answers
23 views

Is there a correlation between Animal Intelligence x Playing time?

I'm writing a small text for a blog about playing time and I wish to have more resources about the correlation between Intelligence and Playing time in animals. If not exactly that, maybe some ...
-2
votes
0answers
33 views

Why are there many separate endocrine glands?

Why can't there just be a single master endocrine gland? Is it just because things evolved this way?
0
votes
0answers
25 views

human digestion: (spicy) food eaten at night is excreted next morning

I have noticed repeatedly, that if I eat spicy food late at night, it is excreted the next morning (after 8-10 hours). How is it possible that the digestion happened so fast? I would have expected ...
3
votes
1answer
53 views

How can neurons divide without centrioles?

I have read in my studies that neurons lack centrioles. If that is so, then how is it possible that new neurons are added to our brain? Does this have anything to do with memory loss?
2
votes
1answer
30 views

What happens when the parietal cells of gut epithelium becomes partially non-functional?

The options are a) The pancreatic enzymes will not work properly b) The pH of the stomach will fall abruptly c) Steapsin will be more effective d) Proteins will not be adequately hydrolysed by ...
1
vote
1answer
40 views

Do camels have nucleated RBCs or enucleated RBCs?

Most mammals have enucleated RBCs as an adaptation to facilitate the transport of oxygen. My text says that camels and llamas are exceptions to these. I was wondering why they are exceptions, and the ...
1
vote
1answer
68 views

Is it possible to have multiple stop codons in one exon?

I would be very happy if someone can help me to find the answers for the following related questions. Can one exon have many stop codons? Can protein synthesis happen, if the stop codon is at the ...
2
votes
1answer
2k views

Does a woman contain all the genes needed to make a man?

I know the answer of inverse is at here, but how about this question? I also read this question, can I imply to human that a woman also contain all the genes needed to make a man? Edit: ok , I ...
0
votes
0answers
30 views

Is there a way to identify a species of tree?

My family has been passing down seeds from a lemon tree for about 3 generations now, There is some controversy about its origin or species. The lemons look like tangerines and when cut the pulp is ...
0
votes
0answers
12 views

Finding SNPs and Haplotypes?

I have the following alignment file. How can I identify the SNP sites and how can I find the haplotypes. I know these are related but can't seem to apply it to the below data. Any help would be ...
7
votes
1answer
90 views

What species of fox is this?

I found this picture of a fox in a news article about arctic foxes in Sweden (source), but I'm not sure whether it is actually an arctic fox. On the one hand, it has white fur, which is the correct ...
1
vote
0answers
17 views

How much yogurt would one have to consume to have a noticeable effect on neurotransmitters [closed]

I read several recent articles that proposed a link between bacteria in our gut and neurotransmitters in our brain. For instance http://www.ncbi.nlm.nih.gov/m/pubmed/24997036/ I am curious how much ...
29
votes
2answers
8k views

Who are humans' closest relatives, after primates?

This question here addresses the controversy of whether humans are more closely related to bonobos or chimps. My question is - which group of animals are are closest relatives, beyond primates? Or ...
1
vote
0answers
19 views

Hair turning back to original color [closed]

I am 86 years old and my hair has been solid gray for over 15 years. Now it is turning back to its original color. (red) I took a three week dosage of 10,000 Biotin in December. Could that cause it ...
5
votes
1answer
202 views

Was Darwin aware of the difficulties behind the concept of species?

Introduction The concept of species is a very old concept that suffers from not being a natural category. There exists no single definition that would categorize living beings into groups and that ...
-1
votes
1answer
55 views

Why might dogs get sick less frequently than their owners?

An article I was reading cited this study result "A comparison of 2473 pairs of dogs and their owners found that dogs were about 50 per cent less likely to have had two or more acute illnesses in the ...
3
votes
1answer
69 views

Can both the overlapping genes (in opposite strands) produce proteins?

I have recognized that both the forward and reverse transcripts from a genomic location code for protein products. Both do occur/express in the tissue of interest. In order to eliminate by chance ...
1
vote
1answer
21 views

Thickness / size / volume of a macrophage

What is the thickness of a macrophage? From some available literature it looks like a macrophage has a 'circular' shape of radius ~10 microns. But I need the thickness to calculate its volume.
1
vote
0answers
18 views

How do I “reinoculate” a petri dish with new bacteria?

Hypothetical question, intended to find a general procedure rather than case-specific recommendations: I have a petri dish full of growth medium with a large population of gram-negative, anaerobic ...
2
votes
1answer
20 views

Flower identification (Singapore, April)

I saw some flowers growing by the roadside today, and was wondering about the species of this plant. The plant also appeared to be fruiting, and it produced small fruits that formed small clusters. ...
0
votes
0answers
2 views

Plant symbiosis, alternative regulation pathways to AON and miRNA399?

I am currently studying systemic repression of both arbuscular mycorrhizae and nitrogen fixing bacteria in legumes. I know of the AON pathway (which works through CLE and NARK). I also know of ...
1
vote
0answers
11 views

Could there be some safe, hypothetical way of turning on and of thermoregulation?

This is something I thought of with the whole artificial gill concept. Could a modification to the brain/nervous system allow a human to turn off their thermoregulation in air/water of the right ...
4
votes
2answers
61 views

Do only large birds float?

So, I've noticed a pattern in water fowl (here meaning birds who can take off and land on water, who float in the intervening time) tend to be larger birds. The smallest I know of are gulls. Are ...
3
votes
0answers
30 views

Is diarrhoea advantageous to the microbe?

Diarrhoea is a common side effect of many feco-orally transmitted bacterial infections. How does diarrhoea help the pathogen? Should it not have a selective evolutionary advantage? Do all symptoms of ...
2
votes
1answer
49 views

Is the birds' decision to fly away congenital or learned behaviour?

I see two possibilities how could the birds know what to do every fall: The birds' migrations are driven entirely by the vertical memetics and today it is just a custom transferred from parents to ...
1
vote
1answer
39 views

Why is the probability of fixation of an allele equal to its frequency?

Introduction In a panmictic population, the probability of fixation of an allele at a neutral locus is equal to its frequency at that time. I will refer to this probability of fixation as calculated ...
2
votes
1answer
30 views

Can lactate be created in ketosis?

After looking at Cori Cycle (from wikipedia) I have a question about how the lactate can be produced in ketosis. According to this article: in a low-glucose state, where the body senses that ...
1
vote
2answers
40 views

Choice of primers for PCR

This exercise was given by my professor but I am struggling to understand the solution. A PCR is performed on the following sequence (in order to replicate the chain and thus have a greater quantity ...
-1
votes
0answers
23 views

Do archaea kill bacteria?

Do they compete with bacteria? If so, how? Are bacteria capable of killing archaea too? I was wondering if archaea could kill bacteria, then we could find new types of antibiotics. Is it possible?
0
votes
0answers
8 views

Phototropism or Hydrotropism is a more important factor for trees beside the lakes growing bending to the water?

I see a lot trees beside the lakes are growing bending to the water and I wonder why. After reading this I think it might be a combined effects by: Phototropism: the lake works as a mirror and ...
1
vote
1answer
44 views

Cell biology books

I'd like to know, what is the best list of books for non-biologist to understand, how signalling between organels is organized inside of eukaryotic cells. I really want to get how cell as separate ...
5
votes
0answers
42 views

Why do viruses last longer on hard surfaces than porous ones

All the papers I've read about survival of viruses outside of the host refer to longer survival times on hard surfaces without explaination. As a layman I would have thought that a virus (who's main ...
0
votes
2answers
35 views

How exactly are gaps defined in genomics?

My understanding is that when sequencing a genome, "gaps" refer to fragments which were not sequencing in the sequencer. Is this correctly? What are there other meanings to the term "gap"?
0
votes
1answer
45 views

How many people in the world have bad eyesight?

I was watching this ted.ed episode and heard it was around 500,000 but that didn't sound right-- does anyone know?
0
votes
1answer
40 views

How do high-throughput/NGS sequencers calculate quality scores?

I am confused as to how quality scores are actually calculated by DNA sequencers like Illumina. For each base call, some quality predictor value is computed, based on various properties of the ...
0
votes
0answers
15 views

What are the major cytological differences between mammalian and non-mammalian cells of the same tissue?

This may be a difficult question to answer, but do we have a comprehensive understanding of the structural differences between cells of the same tissue but different species? For instance, how ...
2
votes
0answers
13 views

Why do fishes have both a gustatory and an olfactory system?

I would like to know if there is a know reason for which fishes (and many aquatic species) have both an olfactory and a gustatory system. As far as I know, in all fish species the chemoreceptors, ...
0
votes
1answer
33 views

Why does sunburn cause fever?

Today I found out that sunburns can cause fever. What I don't understand is how/why? In my understanding fever is the side effect of an immune reaction against an intruder, mainly bacteria (though I ...
0
votes
0answers
12 views

How large are medullary thymic epithelial cells in volume?

I'm looking for a rough average volume of medullary thymic epithelial cells (mTECs/MECs) in humans and mice. It would also help to know how they differ in form (are they spherical, long stretched, ...
0
votes
1answer
27 views

A doubt on Introgression

Wikipedia says that Introgression, also known as introgressive hybridization, in genetics is the movement of a gene (gene flow) from one species into the gene pool of another by the repeated ...
4
votes
1answer
61 views

Why does fever above 102 herald a cancer patient's death?

I was recently intrigued by the observation of a longtime hospice nurse that her cancer patients die a different death than her Alzheimer's or multiple sclerosis or heart failure or COPD patients. ...
-1
votes
1answer
29 views

What is the function of the promoter in the E. coli lac operon? [closed]

Studying for a test and this is a question in the study question, What is the function of the promoter in the E. coli lac operon? The lac operon is a unit of gene expression in E. coli, which ...
0
votes
1answer
35 views

Relative concentration of enzyme vs reaction product

I was reading a paper in which a recombinant protein (His-6 tagged) is expressed in E Coli (BL21 DE3). The yield of the enzyme isolated from the culture is reported as 10-30 mg per L of bacterial ...
0
votes
0answers
12 views

Relationship between Human Sleep Cycles & Sunlight

What is the relationship between the human sleep cycle and Sunlight? Why do humans tend to sleep for longer hours during the night than the day. Since we rely on Artificial lighting during the night ...
0
votes
1answer
16 views

Clarification in the name “white cheeked barbet”

Everyday I was listening sound of the birs "white cheeked barbet". Then I was wondering how this name came to it? It should be by certain properties of them. In wikipedia it says Barbets are ...
1
vote
1answer
24 views

Is water vapour a product of fossil fuel oxidation?

In textbooks, while water vapour and carbon dioxide are said to be the greenhouses gases which are most abundant in the atmosphere, when a table is given showing the top greenhouse gases emitted by ...
2
votes
0answers
56 views

RAGE Oligomerization and Signalling Mechanism

I am looking to understand the mechanism of how the advanced glycation end products, s100 proteins and B-amyloids interact through oligomerization with the RAGE molecule (AGE receptor). I would also ...
6
votes
1answer
123 views

Is there any virus that contains both DNA and RNA in its genome?

It is known that viruses contain DNA or RNA- either one and not both. I came across a question: Which virus contains both DNA and RNA?
0
votes
1answer
38 views

How can a haploid plant be bisexual?

According to Wikipedia: Meiosis is a specialized type of cell division that reduces the chromosome number by half. This process occurs in all sexually reproducing single-celled and multicellular ...
-1
votes
0answers
28 views

Resources for a practical guide to bacterial identification per human specimen

as an instructor in medical microbiology department in a medical college, I need to know what other people use in their practical sessions for post-graduate students as their short yet concise ...

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