All Questions

0
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0answers
19 views

What is the sugar in 'carbohydrates (of which sugar)' label in nutritional information of food products? [on hold]

Is it used to refer to sucrose molecule only or does it include simple carbohydrates like glucose and fructose as well as sucrose?
1
vote
0answers
44 views

What is this insect in winter?

I came across a bunch of these tiny ball-pen-sized insects that (to me) look like they belong to the beetle family. They are all dead but I do remember seeing it once flying in my apartment. They are ...
-2
votes
0answers
22 views

Histone binding [on hold]

As they don’t need access to sequence info Histones should usually bind DNAs minor groove, correct? Additionally, transcription factors ought to bind the major groove for he same reason?
1
vote
1answer
16 views

Lobed Nuclei still count as One nucleus?

Do the Lobed Nuclei of immune cells (such as Megakaryocytes) still count as one nucleus?
3
votes
3answers
93 views

Evolution question on speciation? Really confusing!

Okay, my teacher assigned this homework question, but nothing like this was ever given in our textbook. Suppose that a type of tree tends to speciate over 10 million years and a species of fly tends ...
0
votes
1answer
22 views

How are Cytotoxic T cells transfered?

We learned that Cytotoxic T cells are MHC dependent, and if CMH matchup doesn't occur between the T cell and the cancer cell for example, the former won't attack the latter. If this is the case then ...
0
votes
0answers
5 views

Colour of Vein surface(tunica externa)

If vein from hand is isolated out and blood from within flushed then what will be the colour of vein surface.
1
vote
2answers
63 views

Linked genes outcomes in offspring

This question is from a genetics session in my university: The test cross between a plant with smooth and yellow seeds and a plant with wrinkled and green seeds gives the following results: 140 ...
1
vote
1answer
48 views

Why is the ability to drink salt water so rare in land-animals?

Apparently, some species are capable of drinking salt water, like the sea lion and otter. But given how rare fresh water is, and how abundant salt water is, why have more land animals not evolved to ...
0
votes
0answers
17 views

What is the evolutionary context of bitter taste?

Why do we react to bitter taste the way we do, and how did we acquire this function during our evolution as a species? Could it be that a strong bitter taste is predominantly associated with ...
0
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0answers
17 views

How does the 3d atomic molecular structure of a beta-strand differ to that of a coil?

How does the 3d atomic molecular structure of a beta-strand differ to that of a coil? I am not interested in comparison with a whole beta-sheet but rather a single beta-strand to a single coil of ...
-1
votes
1answer
81 views

Does bone smash or smash bone theory work? [closed]

Bone smash theory is the theory that damaging bones increases bone mass over time. For example, one can moderately strike parts of their bones with blunt objects/weapons like a hammer or etc. to ...
2
votes
1answer
10 views

Range map atlas for insects?

I often use BONAP's North American Plant Atlas, for researching plant taxa ranges. BONAP maintains relatively complete phytogeographic and related botanical databases for all free-living vascular ...
-1
votes
0answers
16 views

Nerve stimulation causes referred pain [on hold]

I notice that I can stimulate a sharp pain in my dextral trigeminal ganglion by pinching a particular place on my scalp with a diameter of about 8mm. The location is at the peak of the auricularis ...
0
votes
0answers
20 views

Sex orientation in homo sapiens? [on hold]

I would like to know more about the biological research that has been done in the field of sexual identity? I couldn't find a link to the work from 2018 that is mentioned on this Science magazine ...
1
vote
0answers
19 views

Learning industry skills for virology?

I am trying to learn more about virology for a tentative job I could be taking soon, as a quality control person in virology. However, I have not taken a formal virology course, nor any course work ...
0
votes
0answers
13 views

Megakaryocyte Multichoice Question

A megakaryocyte: is characterised by a single, large nucleus. gives rise to trabecular bone. is a type of haematopoietic cell. is typically found in yellow bone marrow. I believe it is (1), although ...
0
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0answers
13 views

Can a memory trigger an reverse olfactory sensation?

The sense of smell is closely related to memory, which is why the smell can evoke even long-forgotten memories. But does the record of events, which is recalled in our memory, to the extent of an ...
2
votes
2answers
16 views

Air bubble in addled egg

Im completely n00b in biology, just a question arised during the saturday night warmup and there is no better place to get answers :) So, as probably most of you know, if you want to decide an egg is ...
0
votes
0answers
23 views

Why don't all protein sequences taken from DNA get synthesized?

Why don't all protein sequences in DNA get synthesized? The genome, and subsequently extracted proteome, is much larger than the collection of proteins for which there is any other experimental ...
0
votes
1answer
29 views

Are microsatellites viable markers for GWAS?

I'm just reading some papers on genome-wide association studies and find that most of them use SNPs as a marker. I understand that they're the most polymorphic and thus the best for accurate ...
-1
votes
0answers
45 views

What type of spider is this please [on hold]

What kind of spider is this? Thanks.
0
votes
0answers
11 views

How are communicable and infectious diseases different from each other?

So when I asked my teacher about this, she said INFECTIOUS disease are AIR-BORNE and communicable disease can spread through any medium except AIR! but I still can't seem to agree with it? anyone, ...
0
votes
0answers
11 views

what is the first ionization energy of hydrogen anion (hydride)? [migrated]

maybe this is a question more related to chemical-physics than biology, but since the negative ion of hydrogen (hydride) is used in biology as an anti-oxidant, maybe somebody could answer. My ...
0
votes
1answer
16 views

If an ethnic group holds nearly 100% of a particular haplogroup, does it means that people who have this haplogroup are their descendants?

Let me give you a hypothetical example. If the Egyptians were 100% E3b1, and the Levantines 50%, and the Anatolians 25%. Does this indicate that the Levantines and Anatolians are descended from ...
0
votes
1answer
24 views

X linked traits expression in females

We all know that females have an inactivated X chromosome (Most of its genes are inactivated). Consider a female who is a heterozygous carrier of an X linked abnormality, If the inactivated X was that ...
4
votes
1answer
50 views

Insect/cocoon ID?

Can anyone ID this? We’re in the Rocky Mountains, Western US. We found it stuck to the wall of our garage, a few feet up, hidden behind a snow sled. It seems to be covered, or surrounded, in what ...
1
vote
0answers
16 views

Is the reason why lipid-soluble molecules can pass through membrane because [duplicate]

I have been studying about cell membranes and how water molecules are able to pass through it. (https://www.wiley.com/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htm) It ...
0
votes
1answer
18 views

Are there studies on the effect of reduced CO2 levels on human cognition?

I see studies that indicate elevated CO2 levels (>>400ppm) can cause cognitive impairment. Are there also studies that investigate the effects of cognition under low CO2 levels (<<400ppm)?
-1
votes
0answers
14 views

Can bigonial or bicondylar breadth be increased from masseter hypertrophy/use?

Chewing/clenching the jaw makes the jaw muscles (masseter) stronger, correct? Basically, yeah? So if a muscle becomes bigger and stronger, it pulls on bone. The masseter is inserted from under the ...
-1
votes
0answers
35 views

Can the mandible in humans be rotated without surgery? [on hold]

Can things like mewing, chewing or face pulling affect the angle of the mandible in humans? By "angle" I mean the precise angle between the gonion of the ramus down the mandibular body to the chin -- ...
0
votes
1answer
40 views

How can P450 distinguish between foreign and native compounds?

It is my understanding that P450 enzymes are capable of selectively degrading compounds that enter the cell from the outside (e.g. synthetic drugs) without damaging compounds that are metabolic ...
3
votes
0answers
15 views

Is this a Loranthus Europaeus?

Location: Austria, Vienna Ottakringer Wald Date: Feb 8 I found something beneath a tree with epiphyta , which I thought to be Viscum album but is vividly yellow instead of white and I found no ...
0
votes
0answers
13 views

About Linkage and recombination

What is basic difference between linkage and recombination? I m confusing in that if there is linkage in any chromosone then their must be recombinants.
0
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0answers
21 views

Is hand size in humans 100% genetics or are there environmental factors/etc.? [on hold]

And what genes are responsible for hand shape; finger width and length; palm breadth; etc.? I know it isn't always strongly correlated with height as I've seen males my same height who have notably ...
2
votes
0answers
25 views

Oil absorbed into human skin — where does it go?

For example, I apply petrolatum to my dry hands twice a day as in winter I am usually in a 20-30% RH environment. Within an hour, the petrolatum seems entirely absorbed. According to [1], ...
1
vote
0answers
69 views

What are the (statistically) normal pH levels in the most-outer part of human sexual organs?

What are the (statistically) normal pH values of the outer skin/epidermis of human sex organs (groin/crotch) in the male and female? e.g male testes, female vulva, male glans, the enveloping epiderm, ...
0
votes
0answers
14 views

Human physiology [on hold]

One of my friend said trukish coffee had no side effects but as far as my brief knowledge is concerned it does have some possible side effects. Can anyone help me in this regard?
1
vote
2answers
46 views

Probability of carrying an autosomal recessive trait given both parents are carriers

I recently came across a question that asked for the probability of having a child with an autosomal recessive trait, namely cystic fibrosis. From various parts of the question, we can conclude that ...
0
votes
1answer
24 views

Is there a way to chemically detect the presence of Fungus in a sample? [on hold]

I would like to know if there is a way to chemically or somehow detect the presence of Fungus in a sample?
-2
votes
0answers
42 views

-1 chromosome +1 chromosome = 0 chromosome [closed]

Can a person who lacks a chromosome and a person who has an extra chromosome have a baby that would have a normal chromosome count? What would be likely to happen?
4
votes
2answers
89 views

Does human brain produce nicotine?

I had a discussion with a high school student about the effect and production of nicotine. He mentioned that nicotine is naturally produced in our brain so when the person takes to smoking, the brain ...
0
votes
0answers
24 views

Can you recommend some good reads on virology? [on hold]

I’ve recently scratched the surface of virology and so far have found it fascinating. I’m looking for some books (not text books, more factual paperback essay style book if you get me - eg Music of ...
2
votes
1answer
23 views

Effect of the same caloric intake of different macronutrients on body weight

To gain weight, caloric intake > caloric expenditure. To lose weight, caloric intake < caloric expenditure. But what is the effect of the type of macronutrient ? That is to say : does the same ...
2
votes
2answers
47 views

Typical DNA replication times

Just out of curiosity (I am completely strange to biology), as I have been unable to find this info on the internet: How long does the whole DNA replication process take? (say, the replication of a ...
3
votes
1answer
29 views

How much energy takes C4 photosyntesis to make glucose?

Wikipedia has a kind of contradiction that I would like to understand: According to this link The C3 pathway requires 18 ATP for the synthesis of one molecule of glucose while the C4 pathway ...
1
vote
0answers
15 views

Which statements are true regarding an energy pyramid? [closed]

The number of producers is greater than the number of primary consumers. The amount of energy at the primary consumer level is greater than the amount of energy at the secondary consumer level. The ...
4
votes
2answers
39 views

Can crossing over between X and Y chromosome of sex chromosomes take place? [on hold]

Can it? If no, what would happen if it did?
1
vote
0answers
15 views

Biological Nitrogen Fixation

I just studied Biological Nitrogen Fixation and saw it's reaction but i do not understand why there is 8 electrons and 8 protons are involved and Hydrogen molecule is formed side by side along with ...
1
vote
1answer
29 views

Spermatozoa and sperms

Does spermatozoa and sperm have different meaning?If they are same why do wikipedia have 2webpages ? But most websites mention them as the same thing.I am confused .Thank you in advance

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