3
votes
1answer
154 views

Is this a grass cell?

I found this picture online claiming it was a grass cell. Clearly it is a cross section image but I was hoping you could tell me if this is actually grass, or something else if anything. Thanks!
1
vote
1answer
52 views

Which came first in hominid evolution: language or bipedalism? [closed]

I suspect both language-use and upright-posture have anatomical consequences. So does the fossil record show which came first? NOTE: To the folks who marked this question "homework": This is ...
11
votes
1answer
2k views

On the genetics behind caste marriages

I am in India where it is typically a custom to marry within one's caste. Basically the caste system originated with roots in people's professions - Each of priests, carpenters, troupers, etc had a ...
1
vote
0answers
16 views

What would happen to a body in an astronaut suit over time if floating free? [duplicate]

I'm not sure if this is best in Biology or Physics, but on Earth we decay to skeletons and then eventually to dust. What would happen in space in a space suit?
0
votes
0answers
12 views

Is the molecular basis of asthma a polymorphism or mutation? [closed]

I was researching this for a paper, and though, I've come across some articles that seemingly pose the answer. There were discrepancies between articles that explained asthma to be the product of an ...
23
votes
3answers
3k views

Can humans perceive sounds above 20 kHz?

In the never-ending debate raging in the audiophile community about sound quality and what humans can or cannot hear, it is very very very very incredibly often cited that the upper-limit of the ...
2
votes
0answers
16 views

Cockroaches and magnetic fields

Aloha, I live in Hawaii working with sharks and their sensitivity to magnetism but here we also have large cockroaches. Has anyone worked with cockroaches and magnetism? I wonder if placing high ...
1
vote
1answer
16 views

Mode of Enzymatic Inhibition via R-Allele

The photo above shows the effects of the R allele of the pea shape gene on the synthesis of an enzyme that converts unbranched starch into branched starch. The r allele of this gene determines an ...
-1
votes
0answers
30 views

Zoology versus Physiology versus Physics [closed]

How Physiology is different from zoology and physics? Physiology is the study of mechanism of living system but does it deal with such thing that are dealt by physics like kinetic energy and velocity ...
1
vote
1answer
50 views

How do Streptococcus thermophilus and Lactobacillus bulgaricus precipitate the curd of swiss cheese?

I learned in my food microbiology class that Streptococcus thermophilus and Lactobacillus bulgaricus precipitate the curd of swiss cheese. However, I was wondering what type of mechanisms do these ...
0
votes
1answer
62 views

Why do humans have eyebrows? [closed]

Why do humans have eyebrows? It seems that it isn't necessary but only humans have them, correct? So what is the use of them for humans? I hear that they protect our eyes. However, isn't that what ...
5
votes
1answer
208 views

Why are particular laser-related skin products not recommended for darker skin tones?

This is about products such as: The "Theradome" laser helmet (this claims to stimulate hair growth through lasers) Theradome™, a biomedical engineering company based in the Silicon Valley, is ...
1
vote
1answer
35 views

How to determine if this blood disorder is recessive or dominant?

This question is from "Concepts of Genetics," Klug & Cummings, 10e. "Thalassemia is an inherited anemic disorder in humans. Affected individuals exhibit either a minor anemia or a major anemia. ...
5
votes
1answer
85 views

How did people who were living far from the sea obtain iodine during the Middle Ages?

Knowing that today iodine comes either from fish products or (artificially) enriched table salt, how did people who lived far from the sea survive before (especially during the the Middle Ages)? Edit ...
1
vote
1answer
32 views

The damage of cancer cells

I read about the molecular biology of cancer, and I have a mess on my head and a lot of questions.. . My primary question is- The damage of the cancer cells is in the dna sequence or in the gene ...
9
votes
2answers
657 views

Species ID: Cape Town mystery insect

This insect bumbled into my bedroom last night - can someone ID it for me? I'm mainly curious because I'd like to know if it poses any danger to my cats (who were very eager to add it to the menu). ...
2
votes
1answer
28 views

Is it possible to estimate how much variation in common phenotypes is predicted by genetics?

Phenotypes such as; skin color, eye color, nose shape, lip size, limb proportions, and skull shape. Im trying to find a source for this quote. "If you ask what percentage of your genes is reflected ...
2
votes
1answer
81 views

Cell evolution: immortality vs reproduction

Many sci fi movies produce interesting ideas and technologies that we seem to be able to realize in real life at some point. "Lucy" was not one of those movies. But Morgan Freeman's speech in the ...
2
votes
0answers
11 views

How Many Generation We can Run a Mycelium of Pleurotus ostreatus/Pearl Oyster?

I am able to grow mycelium successfully on the spent coffee grounds. And mycelium is successfully fruiting once/twice on the same substrate. I am cloning by taking mycelium from the existing one ...
0
votes
0answers
23 views

What opens the lower esophageal sphincter(LES)? [closed]

Is it true that the lower esophageal sphincter does not open under voluntary control? When a person swallows food, does something act to open it? If so, how is this opening mechanism called, and how ...
2
votes
1answer
20 views

Identification of unknown bagworm (Singapore)

This bagworm was found in Singapore (near McRitchie Reservoir) some time in June 2012. This is the plant from which the bagworms were obtained: A few examples of the bagworms: The bagworm when ...
0
votes
0answers
12 views

Tm and protein delta H [closed]

we have 2 types of protein , one of them with Tm: x and another one with Tm: x+y but once with lower Tm has higher delta H and another one with higher Tm has lower delta H . how it could be possible?
4
votes
1answer
64 views

Statistics on energy consumption breakdown per biological functions across organisms?

Are there any statistics available on how much energy organisms use for each biological functions (i.e. something similar to the line of "Bacteria spend X% of energy on information processing, Y% for ...
1
vote
1answer
37 views

Gradualism vs. Punctuationalism

TLDR? Just read the bold bits! I started with Darwin's Origin of Species, and then read Dawkins's first three books The Selfish Gene, The Extended Phenotype, and The Blind watchmaker (I just started ...
0
votes
1answer
80 views

Evolution and Death [closed]

I am curious about how evolution views death. I am splitting the question in response to the broad question flag. Is there any species that welcomes death (meaning does not flee/fear death)? Why ...
1
vote
0answers
17 views

Question about clusters and populations [closed]

Whats the difference between a cluster and a population?...and do non africans cluster together? Examples European populations or the niger congo cluster.
5
votes
1answer
193 views

Evolutionary reasons why you cannot tickle yourself but masturbate

There are obviously good reasons that explain why you cannot tickle yourself (see e.g. here). This got me thinking why it is possible to masturbate... Wouldn't it make more sense to not being able to ...
2
votes
1answer
44 views

How can a brainless Cnidarian hunt and defend itself?

Cnidaria, such as jelly fish and sea anemones are radial symmetric en feature a simple body plan. One notable aspect is the lack of a brain. Hence, there is no central guiding structure, no mind or ...
2
votes
1answer
70 views

Plant tissue culture [closed]

Tissue culture means that cells are propagated and multiplied under controlled conditions. Suppose the following situations: a) A seed being is embedded in an Agar medium and germinated under ...
-4
votes
0answers
18 views

Do bigger things smell more or build more odor? [closed]

My mother is always saying that, "The bigger the animal, the more the smell." I was wondering, at least to what degree (if it's actually true), how well this would apply. For example, my girlfriend ...
5
votes
2answers
124 views

Why do skin and nail go blue in cyanosis?

I have learned that Cyanosis presents with blue skin and nails. What is the reason for the blue coloration of the skin and nails? Why wont the skin and nails turn another color in the visible spectrum ...
0
votes
1answer
33 views

How much mass does a person lose in a day through breathing and perspiration?

Water and carbon are lost through perspiration and breathing. How much mass is lost in this way in a single day for a typical person?
1
vote
0answers
28 views

How to measure chemical elements in soil? [closed]

What sort of equipment would one need to ensure that plant soil contains the right concentration of the 13 mineral nutrients necessary for plant growth? As far I understand, it's vital that all the ...
2
votes
0answers
17 views

Why are riboswitches mostly present in bacteria and not in eukaryotes?

Riboswitches are a rather elegant way to regulate gene expression without any additional machinery. A small ligand binds to the mRNA and directly influences transcription or translation. Most of the ...
2
votes
0answers
26 views

Is there any tree or other plant that produces a new crop in fast cycles? [closed]

Is there any tree or other plant that produces a new crop in fast cycles? By fast I would mean something much more often than once or twice a year, like every month or every few weeks. What is the ...
2
votes
0answers
30 views

Can protein sample be made 2% Triton X-100 free?

The protein I am purifying needed an elution buffer with 2% Triton X-100. I formulated the elution buffer not keeping the CMC in mind. My goal is to make my protein sample triton free to check its ...
3
votes
3answers
65 views

True or false & fill in the blanks

A ribosome is where amino acids are linked together by peptide bonds. A virus is NOT considered prokaryotic because it does not have a membrane. The nucleotide ATP is one of the most used energy ...
6
votes
1answer
102 views

What is the limit of time resolution in fMRI?

I was reading about a few studies on estimating functional connectivity between brain areas using fMRI signals. However, as far as I know that fMRI has a very poor time resolution, roughly in the ...
4
votes
1answer
37 views

How to measure metabolic rates of microscopically small animals?

I want to measure metabolism rates in Tardigrades Metabolic rates will be assessed immediately following their exit from cryptobiosis (an animal dormant state). I know that oxygen levels is the ...
2
votes
0answers
20 views

What has to duplicate before cell enters M phase?

What has to duplicate before cell enters M phase? DNA histones centrosome mitochondria (any other organelles?) condensins (not sure?) have I forgotten anything? Thank you in advance!
1
vote
0answers
38 views

What species of Cerapoda lived during the Jurassic?

So far, I've found eleven species of Cerapoda that lived during the Jurassic period. Are there any other known species that I've missed? The eleven that I've found out about are: Agilisaurus ...
3
votes
2answers
60 views

Assessing probability from a pedigree

This isn't exactly homework but I'd like to treat it as such. I'm asked to find the probability that both (III: 2) and (III: 3) are carriers given that (II: 7) and (III: 1) exhibited the recessive ...
2
votes
0answers
17 views

What are the biological mechanisms of candy causing nausea?

As I sit here after eating too much chocolate, I wonder: What are the biological mechanisms behind eating too much candy candy causing nausea in a healthy individual? Is it a spike in blood sugar, ...
8
votes
1answer
134 views

Model for fluctuating selection

Is there any mathematical model to predict the behaviour and long-term consequence of counter-acting selection at different time scale? For example, let's consider the bi-allelic gene A, with alleles ...
-3
votes
1answer
43 views

Could we engineer humans to behave like insects? [closed]

First off, though complex, I'm assuming insects are at an earlier evolutionary stage than humans. That being said, could humans be genetically engineered to behave like insects? I'm not talking about ...
1
vote
1answer
50 views

Is there a known glucosepane cross-link breaker?

I read the following on wikipedia: There is, however, no agent known that can break down the most common AGE, glucosepane, which appears 10 to 1,000 times more common in human tissue than any ...
1
vote
1answer
26 views

What is Mendelian Segregation and how is it related to the Hardy-Weinberg equilibrium?

I can't find the exact definition of Mendelian segregation. In addition, I am wondering how it is related to the Hardy-Weinberg equilibrium?
0
votes
0answers
22 views

Who know the technology about SEAL for developing antibodies? [closed]

Who know the technology about SEAL for developing antibodies? We need custom antibody for our research and I found a technology named SEAL.Sound good,but never take before,it's cheaper than others,but ...
5
votes
3answers
66 views

How does vasoconstriction/vasodilation change blood pressure?

Background: I am coming at this question from an electrical engineering background, and I feel like I am missing certain assumptions that are going into the statement found in my physiology textbook, ...
3
votes
1answer
116 views

How to maximize lung oxygen intake?

What method of breathing provides a sudden surge of oxygen into the lungs filling it as full as possible in volume and density. Deep breaths? Shallow breaths? Breaths taken while bent over? Deep ...

15 30 50 per page