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Top new questions this week:

How does a (stem) cell keep track of its own 'specialization'?

If I understand correctly, as stem cells divide, they become more and more specialized. The very first (fertilized) cell still can divide into every other cell in the body, but as they divide further, ...

cell-biology dna stem-cells  
asked by matthias_buehlmann Score of 10
answered by Bryan Krause Score of 9

How long does an Audiomoth acoustic logger record for?

I'm wanting to record bat echolocation calls using an Audiomoth recorder. However, I can't find out anywhere how long these recorders can record for on a full charge. What is the longest duration ...

asked by Matt Score of 5

How do we know DNA contains all the information necessary to build an organism?

I have always assumed that DNA contains all information necessary to generate an organism, and this appears to be the current scientific consensus. According to Nature's Scitable page on "What is ...

dna development genomes information  
asked by yters Score of 3

Why are telomeres needed to allow DNA replication at the ends of linear chromosomes?

I’m reading Molecular Biology of the Cell by Alberts et. Al and at one point the authors mention the following: We saw earlier that synthesis of the lagging strand at a replication fork must occur ...

dna-replication telomere  
asked by An Ignorant Wanderer Score of 3

Many viruses use pressure to pump viral DNA into host cells. Does that mean these viruses have a narrow acceptance of the genome size?

DNA viruses like bacteriophages and herpes viruses have rigid capsids. The viral DNA is densely packed inside, and the internal pressure is 1~2 orders of magnitude higher than the atmospheric pressure....

asked by 哲煜黄 Score of 2
answered by timeskull Score of 3

T-Cell Receptor Receptor-Associated Immune Receptor Activation Motifs (ITAMs) Inconsistency

In reading the information associated with the cytoplasmic machinery of the T-Cell Receptor (TCR), the one tyrosine motif that is consistently mentioned is the receptor-associated immune receptor ...

cell-biology immune-system protein-structure protein-binding receptor  
asked by Hawkeye Score of 2

Urushiol sensitivity in trees

I have seen a bumpy, rash-like occurence, similar to the rash in humans, on many trees overgrown with poison ivy. I have read that poison ivy gall mites cause a red rash on the leaves of poison ivy ...

biochemistry botany trees toxicology  
asked by noshery Score of 2

Greatest hits from previous weeks:

What is the difference between an antibiotic and an antibacterial?

Concerning medicine, what are the differences between antibiotics and antibacterials?

bacteriology terminology antibiotics  
asked by Tim Score of 15
answered by LanceLafontaine Score of 17

Deciding between chi square and t test

I am always so confused whether to do a chi square test or a t test in the sums given by my biostats teacher. Does anyone have a simple rule to decide this?

homework biostatistics  
asked by biogirl Score of 22
answered by A. Kennard Score of 24

Ramifications and possibility of a diet consuming exclusively of human semen

Semen is a thick, nutritious liquid, rich in vitamins (such as C, B12), amino acids, lipids, monosaccharides (fructose), et cetera. Can semen's ability to fulfill the needs of human organism provide ...

human-biology digestive-system  
asked by Arwil Score of 2
answered by MCM Score of 17

Pedigree Probability of Autosomal Recessive Trait

Here is a pedigree: The trait is autosomal recessive. The question is: What is the probability that the bottom 2 people (4 and 5) have a child with the trait? I tried doing ...

genetics homework genetic-diagrams  
asked by Kirby Score of 7
answered by Rory M Score of 8

What is it called when one human eye is seeing brighter color than the other?

What is the name of a phenomenon where one of the human eyes is seeing brighter/more saturated color than the other? I can observe the same object from the same position while alternating which eye is ...

human-biology terminology vision human-eye perception  
asked by Alex Stone Score of 10
answered by gaurav_jain Score of 6

Differences Between Protein Motifs and Protein Domains?

I am in a 300-level molecular biology class and am unclear about this concept and how to delineate motifs versus domains of proteins. Any suggestions would be much obliged.

biochemistry proteins protein-folding  
asked by Lauren Score of 11
answered by Bitwise Score of 13

What factors affect the rate of transpiration in plant leaves?

I'm trying to get my head around factors which affect transpiration in leaves. For example, how would applying petroleum jelly to the surface of plant leaves affect their rate of transpiration? I ...

botany homework plant-physiology  
asked by Alex Coplan Score of 9
answered by Rory M Score of 7

Can you answer these questions?

Order of iNaturalist taxon levels

Purpose I want to take a collection of iNaturalist observations and build a tree diagram of the taxonomic levels that occur in that sample. Background Most of us have seen diagrams like this or like ...

asked by Galen Score of 1

Photolysis of water

Photolysis of water releases $\text{O}_2$, $\text{H}^+$ ions and $\text{e}^-$. $\text{Mn}$ in the $\text{O}_2$ evolving complex also produces $\text{e}^-$. What provides $\text{e}^-$ to P680:$\text{Mn}...

botany plant-physiology photosynthesis  
asked by Asha Kiran Lima Score of 1

What is the median concentration of spike antigen in COVID positive patients?

I am searching for the plasma spike concentration in COVID patients. The closest possible reference I found claims that spike was only detectable in 5 of 64 COVID-19 positive patients. However, their ...

proteins coronavirus literature  
asked by dodo Score of 1
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