0
votes
0answers
4 views

Cells of Zona pellucida

My textbook states: Blastocyst hatches out by lysis of Zona pellucida with the help of the enzyme strypsin, Later the cells of Zona pellucida gradually disappear. We know that Zona pellucida is ...
0
votes
1answer
10 views

Cell division-— meiosis

Really confused. How many chromosomes pairs do humans have in their sex cells? How many single chromosomes do humans have in their sex cells?
1
vote
1answer
16 views

Biochemistry: How many rounds of the Citric Acid Cycle could perform with complete oxidation of a triacylglycerol with 15-Carbon fatty acids

This was a trickier question on a previous test, and I'm still not sure why, but the answer was "at least four". I answered "more than 22" and got it marked wrong. I assume that each fatty acid chain ...
0
votes
0answers
9 views

Does the edge effect promote biodiversity?

I define the edge effect as: A term used to describe what occurs at habitat boundaries where two bordering communities influence one another. My question is whether it generally leads to an increase ...
1
vote
1answer
12 views

Moth with silver marking on wings

This is a moth that we found on a curtain inside the house a couple of days ago. Unfortunately, these pictures did not come out as well as I thought before I realized it outside. But I was struck my ...
0
votes
0answers
8 views

Are Water Bears powered by a cellular motor?

The following video https://youtu.be/aHsVyb_VfeA shows a Water Bear (https://en.wikipedia.org/wiki/Tardigrade) under the microscope. Starting from minute 1:30 it is possible to appreciate the inner ...
0
votes
0answers
3 views

Serological assays measuring antibody response

Given that an appropriate immune response to a bacteria may be thwarted in an individual, including not producing all of the antibodies which are known to occur in people who have been infected, or ...
0
votes
1answer
13 views

Why is chronic lymphocytic leukemia (CLL) most common leukemia in the West but so rare in Asia?

In "Advances in Chronic Lymphocytic Leukemia" (2013, Edited by Sami Malek), several times it is stated that CLL is very common in Western countries. However, it is quite rare in Asia. (I do not have ...
0
votes
0answers
7 views

Immune suppression and its effect on antibodies and T cell activity

I understand that immune suppression can result in inadequate antibody production when the system is exposed to a pathogen, even when someone is acutely symptomatic. But, do immune disorders also ...
0
votes
0answers
4 views

What did William Harvey discover from experimenting with deer?

On his wikipedia page, I read the following: In particular, Charles' hunting expeditions gave Harvey access to many deer carcasses; it was upon them that Harvey made many observations and ...
1
vote
2answers
10 views

Exponential growth equation and bacteria

I'm a microbiologist, but I'm teaching some ecology in my intro-level course, so when we got to population growth, I thought I'd use the example of a microbial population. But, I hit a strange problem ...
-1
votes
0answers
13 views

T cell sensitivity and persistence to specific bacterial proteins

I am trying to understand the efficacy of a test which detects or measures T cell senstivity to isolated bacterial proteins (Borrelia). More specifically, I want to know what factors or conditions ...
-3
votes
0answers
47 views

Why does fart temperature vary? What's the hottest fart ever recorded? [on hold]

I read somewhere that the average fart temperature is equal to the average human body temperature: 98.6 degrees Fahrenheit. Sometimes I experience hot farts, while other times my farts are like a ...
-1
votes
0answers
16 views

Chemical colouration and carotenoids

How does Carotenoids obtained from diet become an important part of chemical colouration in animals?- What happens after carotenoids enter the body through diet till they cause body colouration? Some ...
0
votes
2answers
27 views

Geographical distribution of malaria and tuberculosis

Unlike malaria, tuberculosis (TB) is found across the whole world. Why and explain? I mean why are people affected with TB more than malaria and some say that in cold and developed countries malaria ...
0
votes
0answers
23 views

Rate of diffusion

I need to find out the intial diffusion rate across membrane. I know the formula of J=DA(C1-C2) but i am confused about how to make the calculations I also know the following: 1) Na+ concentrations ...
0
votes
0answers
5 views

Is salivation decrease during sleep beneficial?

Papers [1, 2, 3] tell that a salivation decrease is not only unpleasant, but harmful for dental health. What cause that decrease? What is the reason for it and do animals have it? I guess it's a ...
0
votes
0answers
3 views

Where do I find the label, whether this file data corroborates to a healthy tissue or a cancerous one in TCGA data?

I downloaded the TCGA dataset for LUAD (Lung Cancer), I find each file with miRNA sequence data like readCount and parts per million value and their are around 123 samples. But where do I find the ...
0
votes
1answer
12 views

Are there any (chemical) processes occuring inside a seed while it's in a dormant state?

If a seed were in a glass jar without a chance of germination, are there any (chemical) processes occurring inside the seed while it sits there? My intuition tells me no since my understanding of ...
1
vote
1answer
26 views

Are ribosomes assembled in rough ER and Golgi body, or in the nucleolus?

I mean all the components, such as ribosomal RNA (rRNA) are synthesized in the nucleolus, but is the whole ribosome structure assembled in the nucleolus or is it also done in the rough endoplasmic ...
0
votes
0answers
8 views

About Hermaphrodite Mitochondrial Inheritance

From the textbook I've learnt that in general mitochondria are inherited maternally. However if the cross is between hermaphrodites (e.g. in C.elegans), where, in most cases, then should the ...
1
vote
0answers
15 views

What is the most common behavior that indicate receptivity to copulation among female birds? Can birds display lordosis?

What is the most common behavior that indicate receptivity to copulation among female birds? If there is not really a "most common" one, where can I find informations about the topic in general? I ...
2
votes
0answers
26 views

Did the Great Oxygenation Event also cause a mass extinction?

Its usually assumed that the Great Oxidation Event around 2.3 bya caused a great extinction of anaerobic life on earth. But as I was reading Nick Lane's book, ...
0
votes
0answers
9 views

Pressure produced by blowing with mouth

I need some figures on the pressure humans are capable blowing with their mouth with zero flow. I only need very approximate figures. I'm guessing around 500mm of water? I haven't got a tube handy to ...
0
votes
0answers
13 views

What is the most important factors that affect our taste?

What ist the most important factor that affects our taste? our mood? (such like GERD) our genes? (more mascular people will need more protein) the food we ate recently? (to choose more diverse ...
0
votes
0answers
11 views

How can I apply any machine learning model/classifier on miRNA seq data?

I recently got micro RNA sequencing data from the TCGA. I am currently trying to early detect Mesothelioma. How is microRNA seq data different from microRNA expression data? MicroRNA expression ...
0
votes
0answers
7 views

Bence-Jones proteins in urine on heat

The preliminary test for proteinuria is precipitation/turbidity on heat due to denaturation. This turbidity should not disappear when 10% acetic acid is added - to differentiate from phosphates. ...
2
votes
1answer
20 views

Do we know a complete list of nutrients that humans must ingest to live?

When the people who are making "nutritionally complete" foods like Soylent are developing their product, how do they know that they've covered all their bases? You need to have protein, carbohydrates, ...
0
votes
0answers
19 views

nitrogen isotopes in plants

From what I know it is possible to assess an animals diet based on stable isotopes from carbon. Does anyone know if its possible, in a similar way, to derive animal community based on N-deposits which ...
1
vote
1answer
94 views

Is metastatic cancer always lethal if uncured?

Can matastases spread in different parts of the body of an animal suffering from cancer grow in a limited way, such as not to cause much more harm that a benignant tumor in those parts of the body ...
2
votes
2answers
46 views

Is there a term for when a detrimental gene can be positively selected for because of linkage to a very fit gene?

Let's say that some piece of DNA would be subject to extreme negative selection if it were independently inherited, but it is very closely linked to an extraordinarily fit gene, and so the complex it ...
1
vote
0answers
52 views

Does reproduction cause aging ? Is aging just a strategy to increase reproductive success in all organisms? [on hold]

Background for why I am asking this: I read a book—modern biological theory and experiments on celibacy— which uses life history theory to imply that reproduction is the reason why organisms grow ...
0
votes
2answers
37 views

Are there genes in sex chromosomes that determine facial features?

My friends and I were bored enough to try out this activity. Picture a teenage boy in your mind. From this picture, remove any accessories (glasses, piercings, etc.), moustache or beard, then ...
-2
votes
0answers
27 views

Why do electrophoresis gel boxes only have 1d wire electrodes and not a 2d 'mesh' as used in clarity?

Since the DNA and protein are electrophoresed in a 2D plane (along one dimension, the length of the gel), I am surprised that a 1D wire electrode is used for anode and cathode, and not a 2D mesh-like ...
0
votes
0answers
25 views

CRISPR Cas9 most updated paper protocol

I am collecting literature to start a new project on CRISPR Cas9 gene editing. I must put together a protocol to start asap. I am intending to use the following paper as guidance: "Genome ...
1
vote
1answer
15 views

A question regarding trichomes in plants

Trichomes in general are features of xerophytic leaves, which reduce water loss by evaporation by trapping water vapor and increasing humidity (as a result lowering the water potential gradient). BUT ...
-2
votes
0answers
24 views

Information about sharks [on hold]

would it be possible for a shark to digest clothing it has consumed during an attack on a human,For example Wetsuit,swim trunks or speedos.
-4
votes
0answers
17 views

after activation of right brain can we smell colours [on hold]

Does colours have smells and is it true that after activation of brain we can identify colours by blindfoldings
1
vote
1answer
22 views

Respiration of an animal cell media

I want to do respiration process of an animal cell media in laboratory environment. I don't entirely sure how to supply it with Oxygen to the process because it is a gas, but not a liquid.
10
votes
3answers
72 views

How does the brain immediately know when one's thirst has been quenched?

The question struck me the other day when I drank a glass of water. I understand that there are at least two conditions under which the brain signals thirst: extracellular thirst, when there's not ...
1
vote
1answer
13 views

What will happen to a neuron if I suddenly remove the pump but not the leaky Na+ and K+ channels?

K+ is more abundant inside the cell and thus has a propensity to move outwards. It has an equilibrium potential of -80 mV. Na+ is more abundant extracellularly and thus has a propensity to move ...
2
votes
1answer
16 views

What is the Cordil that Edward Topsell describes?

In his "History of four-footed beasts and serpents", Edward Topsell describes a "serpent" called Cordil. Since he lists everything that crawls on the ground as a serpent, regardless of being a ...
1
vote
0answers
25 views

Why do some men have patchy beards?

Why do some men have patchy beards? Or more specifically, why would some hair follicles lack sufficient 5-alpha reductase while others nearby don't when their genetic code is identical and they are ...
0
votes
0answers
22 views

Number of pair of chromosomes in sex cells of human [on hold]

Just wondering how many pair of chromosomes in sex cells of human? How many single chromosomes in sex cells of human? Thanks for your help! It is said the chromosomes in sex cells are haploid?
1
vote
1answer
32 views

What is a “noninvasive” biomarker for a disease?

What is a "noninvasive" biomarker for a disease? I know what a biomarker is, but what makes it noninvasive?
3
votes
1answer
23 views

Large black caterpillar, cocoon, moth - Los Angeles

This is my first visit here, probably the first of many, since I have many species to identify! The first is a regular resident of my back yard in the Los Angeles neighborhood of Mt. Washington. It's ...
2
votes
2answers
30 views

Separation of smaller DNA fragments and larger fragments without using gel electrophoresis?

For an upcoming experiment I would have two kinds of DNA fragments in a sample after a particular reaction step: First there would be fragments of a length of approx. 170 bps and then there would be ...
2
votes
1answer
41 views

What's the proper term for “brain waves” read from an EEG?

An EEG records the electrical activity of the brain. An EEG shows voltage differences as a function of time and shows what have become known as "brain waves". Is there a scientific/technical ...
-5
votes
0answers
32 views

Shrink an animal using genetics [on hold]

I need to know this for a science project: Can you shrink an animal using genetics?
1
vote
1answer
46 views

What is the name of this beautiful white trees?

I found this beautiful white trees in an unknown video.

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