3
votes
2answers
1k views

Can cell exist without Ribosomes? [closed]

Last night I came across a question that goes as follows:- Cells cannot exist without a) cell wall b) cell membrane c) mitochondria d) ribosomes I am getting confused with option B and option D ...
0
votes
1answer
244 views

How to select genes before log2 ratio on a RNASeq gene expression matrix, based on signal median

I want to transform a TCGA mRNA expression matrix (in linear data format) to log2-ratios and then run a feature (gene) selection, selecting the 1000 most variant genes (genes with higher standard ...
2
votes
2answers
272 views

Why people fear GMOs? Can't we map a plant composition?

My main question is can we map what a fruit is made of? For instance apples are made of 0.0002% of protein X, 0.00001 of protein Y, 0.001% of amino acid Z... etc... If we can, then my next question ...
1
vote
0answers
23 views

Does the use of a Thiazide diuretic affect the ability of a hair follicle to absorb substances?

Thiazide diuretics are on the World Anti Doping Agency's, as well as the International Olympic Committee, list of banned substances due to it ability to mask illegal substances in urine. The rapid ...
4
votes
0answers
31 views

How to differentiate between similar looking carps efficiently?

Carps look almost the same (e.g - Rohu, Catla). So, is there a specific distinguishing set of characteristics to help determine their species just by looking at them from afar (or maybe in some other ...
1
vote
1answer
29 views

What do we use as baseline to determine what genetic segments are “mutations” (and what are not)

In order to determine whether a particular segment of the genome is a mutation, there must first be a baseline code on which that code looks somehow different. How has the baseline genome been ...
5
votes
2answers
52 views

Immediate stroke/seizure Therapy

Can an oncoming stroke/seizure, be stopped by a setup consisting of a brain-computer-interface (BCI) that immediately detects the variation in wave-form, and then another machine that neutralizes the ...
3
votes
1answer
509 views

Is it possible to process electrical signals from the brain and interpret the results as exact thoughts?

If the brain uses extremely low voltage signals to communicate (from what I understand around 100 mV), what sort of breakthroughs would be necessary to intercept these signals and interpret them as ...
5
votes
2answers
6k views

What does confluency mean?

Since as long as I have been doing cell culture, the word confluency is used to describe the % growth of cells or area covered by them. However, no dictionary that I have found uses this word. I was ...
2
votes
1answer
125 views

How does the ideal free distribution work?

I have recently completed a study on Brent Goose. I found that Brent Geese occupy high quality habitat first then once this is full of geese, they fill up low quality habitat. However, there were ...
2
votes
2answers
59 views

Are there any DNA sequences shared by all/most Viruses?

Is there any one DNA sequence shared by all or most viruses? I highly doubt there is mainly because of how different all of them are, but it's still worth a try. Thanks
1
vote
2answers
1k views

What percentage of human body's cells are contained in blood?

What percentage of human body's cells are contained in blood vs. the rest of the body?
1
vote
2answers
34 views

Can ingesting substances that are produced by the body cause a permanent withering of the organs that produce the substance?

This question is about substances such as insulin and some vitamins that the human body is able to produce on its own. Some substances that are produced by the body are also present in various body ...
1
vote
0answers
33 views

EMBOSS matcher and supermatcher - incongruent results?

I am trying to align a sequence to the mouse genome. I know a priori that part of my sequence should align to chromosome 9, but not all of it. I gathered that EMBOSS' ...
1
vote
1answer
874 views

Why have whales and dolphins not evolved to have gills?

It seems at first glance that it would be an evolutionary disadvantage for a sea creature to have to come up to the surface on a regular basis in order to breathe, so why are there animals (e.g. ...
2
votes
0answers
66 views

Why HIS tag is not detected in WB or dot blot?

I would like to know why the recombinant protein with his tag at c terminus is not being detected neither in western blot or dot blot. I'm trying to validate protein expression of four proteins. ...
3
votes
2answers
629 views

What are the major causes of mutations in DNA?

I know that point mutations can change the base sequence of a gene by altering a specific codon that codes for a particular amino acid. Are these mutations purely random events that occur when DNA is ...
2
votes
1answer
429 views

How come all my family have brown eyes and I have blue eyes?

My whole family tree up to my grandparents have brown eyes, I have blue eyes, how come? I don't know if it matters but I have not received enough oxygen at birth, doctors said it's probably the ...
3
votes
3answers
310 views

How is it possible for the absolute fitness to be more than 1?

The wikipedia definition of Absolute fitness is "the ratio between the number of individuals with that genotype after selection to those before selection. It is calculated for a single generation and ...
5
votes
1answer
131 views

Normal ECG/EKG Measurement?

I'm getting started using ECG using a 3 lead system by iWorx. I have place the leads on my two wrists and the ground on my ankle and have recorded some data into the provided LabScribe 3 software ...
1
vote
2answers
736 views

Should hydrogen peroxide be applied on a bloody nose? [closed]

When I was a kid, my parents taught me to apply hydrogen peroxide on my nose whenever it bled. It's a rare event, but my nose bleeds from time to time, and when it does, I always go through the same ...
-1
votes
1answer
179 views

How far can we go in engineering our own evolution? [closed]

After recently seeing Christopher Nolan's Interstellar and reading Kip Thorne's The Science of Interstellar, I've seriously been reflecting on the challenges mankind faces in becoming space pioneers, ...
0
votes
1answer
957 views

How does the Pectoralis Major work when doing a bench press?

Disclaimer, I'm not a biology undergrad and I only know the basics about muscle movement. I know that doing a bench press works the chest, and specifically the Pectoralis Major because, well, I feel ...
1
vote
1answer
5k views

Arm at Heart Level when Measuring Blood Pressure

How come that one's arm has to be at heart level so that the blood pressure can be measured accurately. I've tried researching this question, but most answers to it were just "if the arm is above the ...
1
vote
3answers
204 views

What is the relationship between protein-protein interaction networks and metabolic networks? [closed]

I am trying to find out how these networks can be linked together. I know that Protein-protein interaction networks and metabolic networks both fall under the Intra-cellular type of biological ...
1
vote
5answers
119 views

Can your immune system's cells destroy you? (Critical thinking and Fictional sense)

In an imaginary sense, If you alone were replicated into 2 so that there should now be 2 of "you" (meaning you both have the same DNA). Then let's say one of you shrunk to the size of a bacteria, and ...
6
votes
2answers
109 views

Why is blood removed from meat? [closed]

Blood is removed from meat before it is consumed. Below is, for example, how chickens are processed from Wikipedia. Removed from transport cages Hung by the legs on a shackle, mounted on a conveyor ...
5
votes
1answer
113 views

Help needed in fish identification

Please help me identify these fish. I looked around but wasn't able to determine its species.
2
votes
2answers
111 views

What's keeping living species from rotting?

Why do only corpses of species rot and be eaten by bacteria? What is keeping us from rotting? Just like fruits, and foods we eat; meat and vegetables rot when left uneaten. Like food, corpses rot and ...
2
votes
1answer
43 views

About modern dating techniques

In a comment to this question, it was said that Radiocarbon dating won't work. For a start the tree needs to be dead, which since you're not using the rings I'm assuming it isn't. Also the atomic ...
1
vote
4answers
696 views

How does HIV mutate into other strains while keeping their virulent phenotype?

How does a virus like HIV mutate into so many strains, and yet all of them are harmful to our immune system? What gives this virus the ability to mutate so efficiently?
1
vote
0answers
48 views

Can I use yogurt to prevent the growth of black mold?

I have a mold problem in my bathroom. There is a narrow groove between the top of my tub and the wall it is attached to where a black gunk repeatedly grows. I can shoot the material out with a spray ...
10
votes
3answers
299 views

Is there a fundamental reason that plants cannot fix their own nitrogen?

Plants must have nitrogen to grow. According to the answer to this question, there are no plants can fix their own nitrogen (without the help of bacteria). Plants get their nitrogen in the form of ...
0
votes
1answer
577 views

Effects of lactic acid ingestion [closed]

What would happen if I drink lactic acid? I use lactic acid to clean an espresso coffee machine and I wonder what injuries could occour drinking it.
18
votes
2answers
2k views

Is any known plant magnetic?

Is there a plant (not a microscopic type but one that is visible to the naked eye) that has so much iron (or magnetite), cobalt, or nickel in its body that it can attract a magnet? In this case ...
0
votes
0answers
80 views

Demultiplexing symmetric PacBio reads

I have PacBio CCS.h5 and the corresponding fasta and fastq files and I would like to demultiplex them. Does anyone know of how this can be done in the absence of bas.h5 files. Thanks for your help! ...
0
votes
0answers
27 views

How to increase contrast with only a top entry specimen holder

My question is: If my microscope had a top entry specimen holder, instead of a side entry holder, what additional option(s) should I have to increase the contrast with the same constraint that I only ...
2
votes
1answer
127 views

Why is oxaloacetate made in the mitochondria?

I'm looking at the gluconeogenic pathway: Pyruvate is shuttled into the mitochondria from the cytosol, converted to oxaloacetate by pyruvate carboxylase, converted to malate which is then shuttled ...
2
votes
2answers
356 views

How can we know or measure pain in animals?

Is there any standard way to know how much pain an animal feels when it gets hurt like when a bird loses it's wing or hen when killed etc. All pain sensation points? Hey I'm new to biology. :)
3
votes
1answer
38 views

What is the purpose of narwals' tusks?

I've heard that narwals can grow their tusks up to 16 ft long. What do they need the tusk for? Hunting? Comunication?
1
vote
2answers
348 views

How does the size of insert affects the rate of Homologous Recombination in yeast?

When performing genetic knockouts in yeast using homologous recombination to replace a target gene sequence via a vector DNA, does the region between the flanking regions in the vector have to be the ...
3
votes
1answer
38 views

DNA replacement: new species

This is a hypothetical question What would happen if the DNA of a prokaryote was replaced with the one of a prokaryote of another species, would the cell structures change and adapt to the new DNA ...
3
votes
1answer
2k views

Pros/cons: linear vs. circular DNA [duplicate]

Why did Eukaryotes evolve to have linear DNA and not circular like Prokaryotes? What are the pros and/or cons?
1
vote
0answers
56 views

how to extract promoter regions given a TF binding site

I have constructed a PWM and want to test its accuracy. Scanning an entire chromosome (chr3, hg18) yields very high false positives (magnitudes higher than the true positives). Scanning the entire ...
7
votes
1answer
505 views

Is the six-layer cortex model of the mammalian cortex still the most accepted model?

I've been reading a bit about the different layers of the cerebral cortex and its clear that certainly not every region of the cortex has the same number of layers. Thus, the idea that every region ...
1
vote
0answers
44 views

If you are God, how would you create an efficient priming reaction? [closed]

Imagine that you are “natural selection” (or God if you prefer) and you can reconstitute replication changing the concentrations or the properties (higher/lower activity; reactivity; etc.) of the ...
3
votes
1answer
7k views

Do Penicillin based antibiotics affect birth control?

I wasn't sure whether to ask this question on Biology or Chemistry Stack Exchange, since it is really biochemisty, but this is something that's been puzzling me. Most pharmacists (all that I've ...
3
votes
1answer
105 views

IPTG and lac operator with e coli for foreign gene question

We did an experiment were we have e coli with a plasmid with a gene from another bacteria in it, and we put in IPTG in for induction. Will after looking up more about IPTG online I see it's related to ...
7
votes
2answers
186 views

A good textbook on GMO

I am interested in learning about GMO. The topic is so wrapped in controversy, that it's hard to find a good book that introduces the basic concepts involved. I went through various university ...
4
votes
1answer
101 views

How is the type of genetic manipulation determined in CRISPR-Cas9?

I've been reading up a bit on the CRISPR-Cas9 system for gene manipulation. From what I read, it introduces double-strand breaks at specific points determined by the choice of sgRNA. But how do you ...

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