1
vote
1answer
52 views

What differences in effect does fast repetitive exercise have compared to slower muscle-building exercise?

As a drummer who likes to play high-energy music (fast, aggressive metal) it's safe to say I burn a fair amount of calories when doing so. But I've been drumming for over a decade and despite the ...
1
vote
1answer
82 views

Why don't bacteria eat food leftovers?

I have thrown a dirty spoon after eating some pasta into one of my desk drawers (doesn't do me much honor). It stayed there for around a year. My house is warm and I think there is enough humidity for ...
0
votes
0answers
31 views

Are there any biological obstacles prohibiting lighter-than-air organisms? [duplicate]

Why there are no organisms that use cavities filled with lighter-than air substances (e.g. hydrogen) to fly and remain in air? Given that there are a lot of fish and algae that use similar cavities ...
1
vote
2answers
82 views

Is this a simple Hardy-Weinberg problem?

Phenylketonuria is a severe developmental disability due to a rare autosomal recessive allele. Approximately 1 in every 10,000 newborns suffer from this disease. Calculate the frequency of the allele ...
0
votes
0answers
18 views

Quantitative measurement of taxis

Is there a way to quantitatively measure different forms of taxis, like chemotaxis, electrotaxis, phototaxis, etc. Along with that, how can we also quantitatively compare the strengths of the ...
1
vote
2answers
139 views

Entropy and Open Systems - AP Biology

I had the following question on an exam of mine and I got the points for the question, but I am wondering if someone could please explain why it is correct, or rather, if it is correct at all: As ...
3
votes
1answer
71 views

Why does the direction of endolymph flow oppose direction of body motion?

In the semicircular canals, the endolymph always flows in a direction that is opposite to the motion of the vestibular apparatus itself. I’m having trouble grasping why this is, and I would greatly ...
5
votes
1answer
236 views

How are reflexes suppressed?

What neurophysiological process keeps reflex arcs in check? For example, the withdrawal reflex causes the hand to jerk back when the fingers touch something painfully hot incidentally. However, that ...
1
vote
0answers
47 views

How are CheY, CheA, CheW, CheZ pronounced in speech?

This is a quick followup question to this question about proteins that play important roles in chemotaxis: How does one pronounce the protein names "CheY", "CheW", etc., in English? My guess would ...
1
vote
0answers
31 views

Genotype-Phenotype databases?

Beyond the Stanford HIV database, what other databases out there provide a dataset linking virus/bacterial genotype to quantitative phenotype? I'm looking for high quality datasets to test machine ...
1
vote
0answers
28 views

recombination between DNA segments question

In the diagram shown above, segments A and C are copies of a repeated DNA sequence, flanking a unique stretch shown as B. A and C are in an inverted orientation relative to each other, as indicated by ...
1
vote
0answers
112 views

mutations induced by transposons

Question: In contrast to chemically-induced mutations, mutations induced by transposons are more likely to ... be lethal de dominant be stable revert to wild types be a gain of function The ...
1
vote
1answer
59 views

tandem repeat sequence; causes of contraction and/or expansion question

Question: Which of the following events, occurring within a tandem repeat sequence, will cause an expansion or contraction of the array? A) Endoduplication B) homologous recombination C) ...
0
votes
1answer
735 views

How does soap affect membrane permeability? Which component of the membrane does it affect?

In a lab we used distilled water + 3 drops of soap to examine how beetroot would be affected by it. I believe the beetroots membrane denatured and a red pigment leaked from it. However, I cannot ...
3
votes
1answer
81 views

Which is more susceptible to dehydration — extracellular and intracellular fluid?

I want to ask in human body, there is intracellular and extracellular fluid that makes up the total body water of our body, which is drained first when we do activities? extra or intra? if I want to ...
0
votes
0answers
12 views

Why do I wake up with morning wood? [duplicate]

According to this answer on a question about the brain, the answer implies that based on certain activities the human body is undergoing, the brain then diverts the appropriate needed resources to ...
1
vote
0answers
27 views

Ice Age Extinctions - Man vs Nature?

As the most recent "ice age" (the Pleistocene) came to a close, changing climatic conditions obviously changed the playing field, driving some species to extinction. But humans were spreading around ...
2
votes
1answer
68 views

Metabolic efficiency for fats and sugars

I am making an exercise for physics students about the first law of thermodynamics, burning heat and evaporation heat. So my idea is to use cycler which runs on fats and sugars where proportion ...
1
vote
2answers
109 views

Why do males have more birth defects? [closed]

I taught in elementary school for 20 years and noticed that males were far more likely to be classified as handicapped than females. More males than females die at birth and are more likely to have ...
8
votes
1answer
126 views

What happens to the food you accidentally aspire?

I'm well aware of health effects of aspiration of solid food and liquids, but I'm interested on what is the reaction of the body on the biological level to the strange body on our lungs. I ask this ...
2
votes
1answer
233 views

What is the global average BMI?

I have been looking for hours trying to find this number, and can't seem to get a straight answer. I've seen some studies that calculate the change in BMI, but for some reason they don't give you the ...
1
vote
3answers
173 views

Telomeres and daughter strands

How is the primer present in the daughter, leading strand replaced? I've circled the primer in question. I don't see how this primer can be replaced by DNA polymerase; there is no free 3' end for ...
2
votes
2answers
233 views

Depolarization and hyperpolarization in stereocilia of the inner ear

It’s a well mentioned fact that when the stereocilia of the cochlear hair cells bend in one direction, the hair cell depolarizes, and when the stereocilia bend in the other direction, the cell ...
4
votes
2answers
85 views

Is it possible for two people to repopulate earth? [closed]

Today I was wondering this question whether it is possible for two people to repopulate Earth. What if everyone else disappeared, except for two people (man & woman)? Can they repopulate? In ...
0
votes
1answer
88 views

Neanderthal and modern human population sizes

Are there any estimates of both the modern human and Neanderthal population sizes over the last, say, 100 k years? Since "purebread" Neanderthals are extinct, their population has to hit zero; that ...
0
votes
1answer
250 views

Description of the paramaters in the packing parameter?

For a phospholipid, the critical packing parameter is given by: $$P=\frac{v}{a_0l_c}$$ And I know that $v$ is the volume of the hydrocarbon tail. $l_c$ is the critical length of the hydrocarbon ...
1
vote
1answer
37 views

Does exercising increase the rate at which UV rays are absorbed and cause affects?

Does exercising while in sunlight affect the rate at which the human body absorbs and reacts to UV rays? As sunburn is the secretion of fluids, increased dilation of blood vessels and inflammation of ...
0
votes
1answer
34 views

Transcription when Chromosomes are Condensed

Are genes transcribed just as well when chromosomes are condensed? I want to design a screen that depends on genes not transcribed when chromosomes are condensed (to identify cells that can't ...
0
votes
0answers
24 views

Mitotic chromosome condensation screen

If I want to screen for mutant yeast (S. cerevisiae) colonies that have defects in mitotic chromosome condensation, can I screen for colonies arrested in Mid-M phase? Would that work?
1
vote
1answer
46 views

Does the new virus tree of life change their position between living and non-living things?

Viruses still do not fit the criteria of living or it's simplest form (the living cell), why would some say that the new virus tree of life makes it more closer to life? Aren't mitochondria in a point ...
0
votes
1answer
39 views

Bio-fuel efficiency as aviation gasoline

Can biofuels replace petroleum for aviation fuel? I've read in the news that Alaska Airlines was flying with 10~20% biofuel and 80~90% petroleum. Is biofuel efficiency comparable to the efficiency of ...
1
vote
1answer
66 views

Is there any possible way to take a DNA test without using blood in humans?

Is there any possible way to take a DNA test without the need to draw blood in humans? Any information will be useful for me.
0
votes
1answer
67 views

Have there been any macro-evolution experiements?

I'd like to start first by saying that I don't believe in creationism at all, nor any non-Darwinian-evolution explanation of the diversity of life on Earth. The theory, the fossil record, and the ...
1
vote
1answer
96 views

Is intelligence (or mental ability) genetically transferred (inherited characteristic) from the parent to the offspring or is it an acquired trait?

The question is simple- whether our mental ability i.e. ability to acquire and store knowledge and comprehend and analyse the stored bits, an inherited trait (i.e. genetically transmitted from the ...
5
votes
2answers
73 views

Do dingos show wolf 'characteristics'?

I've read that Russians have been performing selective breeding on Red Foxes for about fifty years, aiming to make them tame. The wikipedia article says The experiment was initiated by scientists ...
3
votes
1answer
76 views

Plasmid choosing

To design a experiment in feeding of C. elegans. It has to choose a plasmid vector to insert the gene of interest that can feed to C. elegans. Many paper are using pL4440 for the feeding vector, ...
1
vote
0answers
48 views

Which Lactobacillales (Lactic acid bacteria — LAB) strains are capable of degrading starch?

I've been researching bacteria strains but am having trouble finding amylolytic LAB strains with amylolytic and lactic acid producing character. The only species I've found, that are capable of ...
2
votes
1answer
28 views

Summarising ChIP-seq and controls needed

As part of my study I have to present on a method of discerning binding sites of proteins to DNA, for which I have looked at ChIP-seq. This is a brief overview of what I have so far, and was wondering ...
0
votes
0answers
22 views

Hemp and cotton

Hemp fibre has a higher tensile strength and toughness than cotton. Could anyone explain how their different chemical compositions and molecular structure (E.g. beta sheets if any present, bonding,etc....
0
votes
0answers
64 views

Are lines (wrinkles) on the human forehead skin related to science of (often worried) thinking?

It is the common observation that when we tend to think about anything, most often, we tend to make the conformation of raising the skin of forehead; from my observation this is the most common ...
2
votes
1answer
43 views

Why does mud therapy work by some pain related diseases?

Apparently, some users here agree there is no ion exchange through the skin. Mud therapy has some therapeutic effect for pain related diseases. As an anecdotal example, I experienced pain relief by ...
0
votes
1answer
30 views

kinetics question [closed]

An enzyme has a $V_{max}$ of 50 $\mu$mol product formed $(min * \text{mg protein})^{-1}$ and a $K_m$ of 10 $\mu$M for the substrate. When a reaction mixture contains the enzyme and a 5$\mu$M ...
0
votes
0answers
15 views

Avoid Blood lyse color remain in DNA extraction

I tryed several times to extract DNA from freezed blood sample whit Qiagene kit but it gave very small amount of product due to good purity then I try extract manually by using CTAB PVP method and ...
0
votes
1answer
44 views

How can rapid growth cancer get nutrients in vivo?

When I was little, before I get into biological studying, I read a news talking about cancer would be totally cured after decades. I still remember that researchers had a theory to claim if they could ...
9
votes
1answer
480 views

Can people with AIDS get a fever?

It's my understanding that fevers are an immune system response to infection. Like the body's cells can take more heat than most viruses or bacteria. So if that's the case then can you even get a ...
1
vote
0answers
29 views

Symbiosis of Pseudomonas Fluorescens

Have a modest background in molecular biology and presently considering a project that requires some knowledge of botany. Specifically, I seek details on the epiphytic relation between the microbe ...
1
vote
1answer
45 views

Resolution of gel electrophoresis

My professor mentioned the resolution of the gel in gel electrophoresis. He stated that agarose has large pores and thus low resolution whereas polyacrylamide has the opposite. I don't understand ...
2
votes
0answers
37 views

Rushed publications based on flawed data

In 2014 BICEP2 made a very controversial press release. It was rushed, given before any papers where published, because they feared they would be scooped by another similar experiment. In the end it ...
35
votes
3answers
4k views

How could humans have interbred with Neanderthals if we're a different species?

To be clear, I'm not doubting that homo sapiens and homo neanderthalensis did interbreed: of that much I'm convinced. Within the past few years I've seen an upcropping of pop-sci articles discussing ...
1
vote
0answers
33 views

Is lung size/shape a factor in long-continuous running of animals?

Apart from other factors, does lung shape/structure/size play any role in long-continuous running animals. Is there any similarity in lung structure between different long-continuous running species?

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