1
vote
0answers
13 views

Martian Abiogenesis?

In the Miller-Urey experiment the probability of the chemical origin of life under (hypothetical) early Earth atmospheric conditions were assessed. For that water, methane, ammonia, and hydrogen were ...
0
votes
2answers
46 views

What is the meaning of a reported OD600 value?

I can't find a reference that explains what, for example, OD600 = 0.1 means. For example, Wikipedia states OD600 is an abbreviation indicating the absorbance, or optical density, of a sample ...
2
votes
1answer
120 views

Is there a genetic reason explaining the difference of the height of male and female?

The male and female height difference seems to be around 1.08 if all cultures are counted from these stats: https://en.wikipedia.org/wiki/Human_height Can this ratio, 27/25, be explained by genetics ...
4
votes
2answers
57 views

Capture recapture for only two visit assuming a open population model

I have a study system where I’m doing a capture recapture analysis. I mark fish in one year and I’m recapturing a subset of them the next year. I only have 2 capture events. Since a lot of time has ...
-1
votes
1answer
25 views

Product of reaction between HCl and bile [closed]

In the mammalian digestive system HCl is the main acid and bile is the main alkali. What is the product of the reaction between these two chemicals?
-1
votes
0answers
37 views

Why does female's age of puberty inform on mating system?

Reading from Does increased calorie intake cause increase in libido in humans?, @AlexStone says: I'm aware that humans have a dual mating strategy - somewhere between pair bond and casual mating. ...
2
votes
2answers
34 views

Function and expression of pseudogenes

Can pseudogenes be transcribed into mRNA and translated into functional proteins, or should they be regarded as functionless mutated genes?
6
votes
1answer
55 views

Why don't bacterial cell walls prevent bursting when attacked by the complement?

The complement system creates pores in cell membrane which leads to influx of lots of water thereby causing lysis of bacterial cell. But what I fail to understand is that if bacteria have cell walls ...
0
votes
0answers
15 views

Is artificial control over neural transmission possible?

We know that neurons transmits electrical signals. At the present we have instruments to observe neural transmissions, but is it possible to interfere in its transmission from outside electrical ...
-1
votes
0answers
7 views

How do I test if something will have an adverse effect on marine life? [on hold]

I want to test a variety of different substances on water, but not with any life inside the water. How do I test if the substance will have a bad effect?
2
votes
1answer
47 views

Identity By Descent vs Identity By State

Background The concepts of Identity By Descent (IBD) vs Identity By State (IBS) are central in population genetics, yet I fail to fully wrap my head around the definitions. You can find examples ...
7
votes
2answers
793 views

Does breath-holding cause permanent brain damage?

My question is: Does voluntarily holding your breath at atmospheric pressure for a few minutes can cause brain damage? I'm talking about periods of time around 3 minutes. I've read there are some ...
1
vote
1answer
81 views

How can I find the most studied SNP of a gene?

How can I find the most studied SNP of a gene and diseases that the most studied SNP has been related to? I search in dbSNP database but I can't find it. What is the process?
0
votes
1answer
14 views

Catalytic Triad of Serine Proteases

Is serine considered an acid in the catalytic triad involved in the mechanism of action of serine proteases? It is donating a proton to His but I am not sure if this really qualifies as an acid?
-1
votes
0answers
44 views

Is there an evolutionary purpose for postpartum depression in human females? [closed]

Essentially what the title says...It seems odd that at the very stage in which new life is supposed to be protected, we see new mothers at a higher risk for particular kinds of mental illness (...
0
votes
3answers
209 views

Do chromosomes uncoil in interphase II?

During interphase II, there is no S phase in which DNA replicates. However, in this stage, do the chromosomes remain wound? Or have they unwound into chromatin form, and recondense during prophase II?
7
votes
1answer
106 views

How many dinosaur genes are in a chicken genome?

I read recently that we can "work back" to a dinosaur by selectively turning off certain genes in chickens, and we were able to create a chicken with a snout instead of a beak. How many dinosaur ...
6
votes
1answer
116 views

Did any dinosaur molt?

Like snakes or lizards, did any dinosaur molt ? if yes, have we any proof of it ?
0
votes
0answers
9 views

Strategy for tree and shrub identification

I often find it difficult to identify trees and shrubs even though I have many handbooks and manuals on trees and shrubs in my area (New England). The typical problem is that the species is not in the ...
3
votes
2answers
65 views

Codon tables and the wobble hypothesis

In E. coli, there are only 47 different tRNAs but 61 potential anticodons. This is because, from what I understand, the third base of the anticodon can pair by wobble rules. However, it is known that ...
4
votes
2answers
180 views

Redundancy of the genetic code

One particular codon codes only for one amino acid, but an amino acid can be coded for by several different codons. Now according to the genetic code, the codon UUU ...
4
votes
1answer
1k views

How does a Plasmodium move?

Plasmodium sp. does not have any locomotory organs. So, how does it move? What biochemical process allows it to move?
0
votes
0answers
14 views

How can I measure the curvature of bird's beak on the field?

I'm wondering if there is a standard tool to measure the bird's beak curvature. It seems that a spherometer wouldn't work because the beaks that I'm measuring are not circular but more parabolic. ...
1
vote
0answers
17 views

Robertsonian translocation on the same chromosome

is there any big difference between Robert-son-i-an translocation between two 13 chromosomes comparing to a translocation between 13 and 14 chromosomes
4
votes
1answer
42 views

Why does migration distance depend on log of molecular weight in SDS-PAGE?

I really want to know why in the result of SDS PAGE, log of molecular weight(MW) and migration distance (distance from the loading well) have a linear relationship. Why is it log(MW) instead of MW? ...
3
votes
1answer
60 views

What is the name of the bird which feeds on penguin blood and meat in Tristan island?

I just watched a National Geographic documentary "Unseen Islands: Atlantic Arks" and there was some thing strange in Tristan island. Some small bird which changed its diet to feed on the blood and ...
1
vote
0answers
43 views

Need Help on a Biology Question about Pedigrees [closed]

I was given a biology question that says: "Which of the following pedigrees could occur if the shaded individuals show an X-linked dominant trait and partially shaded individuals are unaffected ...
-1
votes
2answers
25 views

Good microscope? [duplicate]

Hi I am a teenager and I recently studied biology and found it very interesting. I want to get a microscope and study further into the microscopic world. What would be the best microscope for me? I ...
3
votes
1answer
42 views

What negative effects does cannabalism have in other species (like prion diseases) and how are they mitigated?

It is well known that human cannibals are likely to suffer from a variety of ailments, particularly prion diseases. However a great many other species, from insect to ape practice cannibalism at much ...
1
vote
1answer
30 views

Binding kinetics of 6xHis-Tag

For the planning of an experiment I would like to know the binding kinetics (kon and koff) of a 6x-His-tag to a Ni-NTA surface. I know they should differ due to surface quality and position of the ...
4
votes
1answer
4k views

Why can blood group O be given to all blood groups?

Blood group O has antibodies against antigens A and B. Blood group A has A antigen. If someone with blood group A receives donor blood with group O, then anti-A antibodies in the donor blood should ...
16
votes
4answers
11k views

Are trees the only source of large amounts of oxygen?

Trees use carbon dioxide and produce oxygen in the presence of sunlight. But is there any other source? If yes, are trees the most important source of oxygen, or is there any other source which ...
0
votes
1answer
19 views

What is the name of the groove down the middle of an anther?

I thought it had a name along the lines of interlocular groove, but I haven't been able to find that term anywhere.
3
votes
1answer
58 views

What is the substrate for glycogenesis?

In glycogenesis (i.e. the synthesis of glycogen), are sugar phosphates the direct substrates for glycogen polymerization? I would certainly think so since glucose is phosphorylated and then stuck onto ...
2
votes
1answer
47 views

Is there a certain environment where all cellular functions (or at least some) increase their rate?

Is there a certain environment in which all the functions (or some) inside a cell increase in their rate? Would the increased rate cause any damage to the cell?
0
votes
0answers
12 views

What is the acceleration profile of the grey hound?

I'm interested in the acceleration curve over time that's typical of an adult grey hound prior to attaining this peak velocity. My curiosity is motivated by a desire to better understand the data ...
3
votes
1answer
22 views

What does “cell type composition” mean?

I am reading an article about detection of differential methylation. They use the term "cell type composition" in the following context: "Researchers need to carefully design studies that associate ...
0
votes
1answer
21 views

What is the acceleration profile of a cheetah?

I'm interested in the time it takes for a cheetah to reach maximum velocity as well as the acceleration over time that's typical of a cheetah prior to attaining this peak velocity.
3
votes
1answer
49 views

What are the exceptions of Mendel's laws?

What are the exceptions of $-$ Law of dominance Law of independent assortment Law of segregation My knowledge: Exception of law of dominance: Incomplete dominance: Unlike dominance in ...
0
votes
0answers
9 views

Why Streptococcus bacterias don't separate completely?

Why Streptococcus bacterias don't separate completely from each other? Is there any connection with this phenomenon and Fts proteins and related mechanism in cell devision?
3
votes
3answers
72 views

Can plants grow without photosynthesis?

Animals can survive without eating if nutrition is injected directly into their blood. Can the equivalent be done with plants? By injecting carbohydrate rich nutrient solution, either without ...
0
votes
1answer
24 views

Confusion over equations for population's heterozygosity vs. heterozygous individuals

On page 24 of Gillespie's Population Genetics, 2nd ed, an equation for $H$, the probability that two randomly drawn alleles are different by state, is given. $H$ is stated to be similar to the ...
1
vote
1answer
39 views

Does having to urinate imply that you are becoming dehydrated?

This question came up after I read another question that coffee does not dehydrate you, but instead acts as a mild diuretic. Does having to pee imply dehydration? Allow me to elaborate: When you ...
2
votes
1answer
30 views

What constitutes as the death of a bacteria?

I've read that some bacteria can survive a long time without food. What constitutes the death of a bacteria ? What process needs to take place for it to be considered dead?
0
votes
1answer
34 views

How to prevent a old promoter region from attaching onto a plasmid instead of a new one during ligation?

What I am trying to do is take out a existing promoter region in a plasmid, and replace it with a new one. So first I use the appropriate restriction enzymes to get rid of the existing promoter region....
0
votes
0answers
20 views

A question about cat coat colour genetics

I have a question about cat coat colour genetics. Concretely, the breed Russian Blue comes in several colours. The desired colour is "blue" which is black diluted and is recessive. See for example ...
0
votes
0answers
7 views

How can I verify the long term bio compatibility of an implant?

Is there a technique to find out if a material coating is biocompatible? One obvious method is implanting the object and waiting, but this carries massive risks and should not be attempted.
1
vote
1answer
24 views

Breathing's Role in Aerobic Respiration

It's my understanding that aerobic cellular respiration is summarized in the formula $C_6H_{12}O_6+O_2→CO_2+H_2O+ATP$ (unbalanced). The glucose is thrown through a series of chemical reactions, ...
11
votes
1answer
682 views

Why don't rats have a gallbladder, unlike other rodents?

It has long been known that rats do not have a gallbladder, though other species including humans, monkeys, cows, reptiles, dogs and mice, all have a gallbladder. In this paper from almost 100 years ...
2
votes
0answers
14 views

Where should I go for online information on animals endemic specifically in Mozambique?

I've been involved with the citizen science project "Wildcam Gorongosa" for over half a year now (website, forum). As there are lots of unexperienced volunteers, many questions are being asked. Often ...

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