All Questions

1
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1answer
12 views

Do all drains lead to the ocean? How to explain using Hydrologic Cycle?

Is it true that all drains eventually lead to the ocean? And if so, how can this process be explained by the hydrological cycle? Furthermore, say if I was to flush something down the toilet that I ...
0
votes
1answer
77 views
+100

Does “Garbage Enzyme cleaner” contain cleaning enzymes?

There are many recipes which call for using fruit peel fermentation process to make a concentrated enzyme cleaner solution, some variations call to add bakers yeast. So the question arises that does ...
0
votes
1answer
18 views

Does too much Genetical Modification leads to formation of new species?

I think Genetical Modification can be termed as 'Artificial Mutation'. Is it possible that genes can be modified so much that it leads to the introduction of new Species i.e Can integration of large ...
3
votes
1answer
29 views

Mechanisms of extracellular stimulation of neurons

When stimulating a group of neurons with an electrode, let's say we put it in a region that contains axons, what is the mechanism by which the axons are stimulated? I've been told electrodes ...
3
votes
2answers
123 views

The gender of offspring of Twins?

Given identical twin males, Michael and Douglas, Douglas and his wife have four children, all of whom are girls. Michael and his wife have only one child, a boy, and are expecting another. What are ...
8
votes
1answer
78 views

Why is the Krebs cycle considered a part of aerobic metabolism if molecular oxygen is not involved in any of the reactions in the cycle

Why is the Krebs cycle considered a part of aerobic metabolism if molecular oxygen is not involved in any of the reactions in the cycle? I originally thought that Krebs cycle was aerobic metabolism ...
0
votes
1answer
11 views

Could transfusion of a different blood type cure blood-based cancers?

Different antigen detection triggers an immune system response that could perhaps stimulate mitochondria and such in killing cancer cells - something like chemo without the hair-loss?
0
votes
0answers
10 views

what is the role of ctab in plant dna extraction [duplicate]

i get good results for dna extraction by using ctab method but i doesn't have that proper information for role/function of ctab and other chemical. Anyone know, please briefly explain ......
2
votes
1answer
44 views

Poisonous plants, animals, mushrooms: is this always a kind of defense?

I wonder whether developing deadly toxins in the organism's body is always or usually a defensive strategy rather than a by-product.
21
votes
5answers
2k views

Why are there species instead of a continuum of various animals?

As I understand it, various animal traits have to evolve gradually, but what happens to the species that are "neither here nor there"? To put it differently, if a species evolved from another, it did ...
2
votes
1answer
29 views

What can myelination tell you about the evolution of sensory receptors?

I am reading Avi Chaudhuri's Fundamentals of Sensory Perception and wondering if the information given about the somatosensory system could tell us anything about the way it evolved. It seems (at ...
3
votes
1answer
50 views
+50

Why do I feel funny in my tummy when riding a virtual roller coaster?

I've ridden a virtual roller coaster on an Oculus Rift. I felt tension as I went up to the top, but more interestingly I actually felt my stomach drop when I went down the steep drop on the other ...
10
votes
1answer
134 views

How reversible is DAT upregulation from long-term ADHD medication use?

A mechanism for ADHD stimulant medication tolerance has now been found. See http://neurosciencenews.com/adhd-medication-patient-brains-adapt-dat/. Here's the thing though: what exactly is the ...
0
votes
0answers
25 views

Are Humans Evolving? [duplicate]

Due to migration & absence of reproductive isolation,has human evolution stopped? As evolution occurs when there is absence of mating between two population,growing trends of interracial ...
3
votes
2answers
61 views

Functions of the CFTR gene?

I am a senior in high school and I am studying cystic fibrosis. I don't quite get the function of the CFTR gene as this is my first time dealing with this type of heavy scientific info. I had ...
1
vote
2answers
50 views

Why is Eadie- Hofstee Plot not linear

Besides the reason of cooperativity between multiple active sites on an enzyme, what are the other reasons for the Eadie-Hofstee plot to be non-linear
0
votes
0answers
51 views

How can periodic asystole of heart cause cataplaxy with partial asystolic syncope? [on hold]

In brain, it can be called reflex asystolic syncope - symptom unconsciousness. In heart, there can be temperary asystole, still with consciousness. If these occur at the same time but with brain ...
3
votes
1answer
71 views

What is the H+ gradient in mitochondria?

I would like to understand what the term H+ Gradient means. I googled this question and found terms such as chemiosmosis and ion gradient being tossed around. I am very new to biology and I do not ...
0
votes
0answers
22 views

Gene Therapy for Cystic Fibrosis

I have another question regarding cystic fibrosis. I understand that gene therapy is currently being talked about in the cure for cystic fibrosis. I know that Eric Alton at imperial college London is ...
2
votes
1answer
89 views

Do SSRIs downregulate or upregulate the 5-HT3 receptor?

What effect do SSRIs have on the expression of the ligand-gated ion channel, the 5-HT3 receptor?
0
votes
0answers
17 views

What accounts for diversity in species? [duplicate]

Why are there so many similar life units? (creatures, plants, etc.) Or, in other words, why is there great diversity among life units yet great similarity between similar groupings of life units? Why ...
0
votes
0answers
23 views

What circumstances allowed humanity to flourish (Where did ALL the humans come from?) [on hold]

Based upon some responses to What should three men and three women do if everyone else is dead it got me thinking, "Certainly something of the sort had to happen to humans, or, generally, any given ...
4
votes
1answer
54 views

Are fish and reptilian scales homologous?

Wikipedia: Fish scales are dermally derived, specifically in the mesoderm. This fact distinguishes them from reptile scales paleontologically. So aren't reptilia scales also dermally derived?
0
votes
0answers
23 views

i need help on a chart comparing mitosis and meiosis [on hold]

I inserted the chart I did the first two blanks but the rest really confuses me and this is due real soon I need help. I have to chose from the answer options.
2
votes
2answers
46 views

Book recommended for neurobiology

I am looking for a good explanatory book concerning Neurobiology. I am interested on how the brain works but prior to this I believe that I have to start learning things about the biology of neurons. ...
1
vote
1answer
37 views

Bacterial Cell Problem

A microbiologist has discovered what she thinks are two new types of algae. The first cell (Organism 1) appears cubic and is approximately 1.5 μm long, 1.5 μm wide and 1.5 μm deep. The second ...
1
vote
1answer
68 views

For how long can a raven stay airborne (a week or more)?

I'm wondering for how long a raven can stay continuously airborne, if strained to do so? If it makes a difference, I'm mostly interested in the Common raven, Corvus corax. Are there for instance any ...
2
votes
1answer
234 views

Why do antidepressants have a delayed onset of action?

Why do antidepressants take so long to reach efficacy? I've read of theories about it perhaps being due to the strength of negative feedback via serotonergic and adrenergic autoreceptors during the ...
7
votes
3answers
127 views

Which part of the brain needs to be shut down to lose conciousness?

Whether it is mechanical (trauma), chemical (anaesthesia) or electrical - which part of the brain is shut down to cause loss of consciousness?
9
votes
3answers
653 views

How are our senses dimmed during sleep?

Our senses are not as sensitive during sleep compared to wake. There is an arousal threshold during sleep that only when it is overcome will it wake a person up. My question is how is this arousal ...
0
votes
0answers
10 views

C.elegans and nutrition

If presented with an ample amount of food, do C.elegans organisms know when to stop eating or do they store extra energy? Could they also put this extra energy to use by moving faster or creating more ...
2
votes
0answers
29 views

What is the allelic frequency at mutation-selection-drift equilibrium?

mutation-selection equilibrium At mutation-selection equilibrium the expected frequency $f$ of a given locus is $$f ≈ \frac{\mu}{s\cdot h}$$ , where $\mu$ is the mutation rate, $s$ is the selection ...
1
vote
2answers
54 views

Why would yeast grow but not produce alcohol?

I'm studying for my intro to microbiology test and I have a question asking why a culture of yeast responsible for producing alcohol would be growing, but not producing alcohol? The multiple choice ...
0
votes
0answers
33 views

Resources: Learning About the Brain

I am trying to find some resources to learn more about how the brain functions. Specifically I would like to learn how the basal ganglia works. Encyclopedias and academic papers don't explain things ...
-1
votes
1answer
68 views

Does our brain really “flip” images perceived by our eyes?

I know a similar question has been asked and this is closely related to cognitive science. However, I want to know whether is there any mechanism or structure in the visual cortex which is proved to ...
1
vote
2answers
40 views

Is the Hypothalamus part of the Central Nervous System or Endocrine System

Sorry for a certainly naive question. Some references (for example https://faculty.washington.edu/chudler/nsdivide.html) seem to to indicate that the hypothalamus is part of the Central Nervous ...
3
votes
2answers
43 views

How exactly can dsRNA be introduced to a cell?

Is it just by viruses or are there other means by which it gets into cells, such as plasmid uptake?
21
votes
2answers
9k views

Where do migratory birds go when it rains?

I was reading a comic from XKCD which inspired me to ask this question: "well, where do they go when it rains?" I know that when it rains you usually don't see any birds flying through the sky. I ...
-2
votes
1answer
87 views

Can Panic disorder induce Atrial Fibrillation and Temporary Cardiac Asystole?

This question is partly based on the article "Asystolic pauses in atrial fibrillation. Incidence, dependence on the underlying disease and significance for pacemaker therapy", where the exact ...
1
vote
1answer
19 views

If hermaphrodite C. elegans can reproduce with females?

C. elegans can self fertilize, or they can mate with males. But are they able to mate with females? Or is there some kind of morphological barrier that prevents that?
2
votes
1answer
48 views

Hamming distance between two DNA strings

By definition from Wikipedia, the Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different. In other words, it is the number of ...
6
votes
2answers
47 views

How to find miRNA binding sites on a specific gene?

I am trying to find miRNAs that bind to the 3'UTR of a specific gene. What is the best way of doing that (that is, with a good scoring analysis that is most commonly used by researchers in this area)? ...
0
votes
1answer
21 views

Recovery from a more severe injury can be shorter than from a less severe one [on hold]

I vaguely remember reading somewhere that in certain cases, recovery from a more severe injury can occur faster than from a less severe injury. This was motivated by claiming that the less severe ...
0
votes
0answers
20 views

Is it possible to simulate the effects of high altitudes for plants?

Note- I considered asking this on gardening.stackexchange.com but i believe it is better suited for this site since it deals with more complicated material. As I understand it, certain plants ...
6
votes
3answers
257 views

Why does replication require primers while transcription does not?

In transcription, there is no need for any primer. I guess the basic mechanism of DNA polymerase & RNA polymerase is the same. So why does replication have the need for a primer?
0
votes
0answers
30 views

pedigree analysis calculation of the probabilty of 1 child having phenylketonuria out of 4 children [on hold]

In a family flows an autosomal recessive phenyketonuria trait.consider a couple with unknown genotype.Their grandparents are heterozygous carriers for sure and the parents of the couple have unknown ...
-2
votes
0answers
33 views

Eadie-Hofstee Plot [on hold]

If an eadie-hofstee plot shows two distinct gradient, Does this imply cooperativity between the two active sites? and how do we find the hill coefficient? The question asked us to plot graphs of V ...
-1
votes
0answers
30 views

Is autocatalysis a non-Michaelis-Menten Reaction [on hold]

If a reaction involves its own product altering the rate of reaction and the affinity to the substrate, does it still obey the Michaelis-Menten kinetic model?
3
votes
2answers
11k views

What does 5' and 3' mean in DNA and RNA strands?

What are 5' and 3' in DNA and RNA strands? Please clarify with some images and please use simple English.
0
votes
1answer
35 views

Epitope annotated protein

What is epitope annotted protein?? The book from which I got this term is : http://www.springer.com/biomed/immunology/book/978-1-4939-1114-1

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