Specifically, I am looking for articles dealing with secondary growth, frost resistance, abiotic and biotic stress. Doesnt matter if its original reasearch or a review. I am studying Biotechnology and we have to analyse two articles on one or more of these topics for a Genetics of Perennial Plants lab. Thank you all in advance.

"What is the best day to maximise the possibility of impregnation":

1. the start of menstruation
2. the end of menstruation
3. 10th day after menstruation ends
4. 14th day after menstruation ends

this is a question in my human biology class my answer was (4) "the 14th day after menstruation ends" since it's supposedly when ovulation happens.... but apparently it's not? i checked the answer sheet and the right answer is (3) "10th day after menstruation ends"

can someone explain?

You’d expect the opposite, since:

• it’s mountainous
• hence, thinner atmosphere
• hence, more exposure to UV radiation
• hence, more evolutionary reasons to develop pigment that protects from skin cancer.

Same for, let’s say, Tibetans. Where is my logic faulty?

Hi, I'm a bio undergrad writing a comparative research paper on zooxanthellae symbiosis in stony corals and boring sponges. In my research into the importance of coral reef ecosystems, l've found that many sources describe the waters corals are found in as 'nutrient poor.' Why would the waters be nutrient poor though? Most coral reefs are costal and all the ones relevant to my paper are in the photic zone, which to me, seems to contradict the idea that coral reefs originate in nutrient poor waters. I've been working on this paper for so long idk if it's really obvious and I'm just losing my mind but every source i find just calls coral reef waters nutrient poor and leaves it at that and I waited till the last minute so I can't really ask any of my profs if they know 😭😭

Hello, I'm wondering how do some of you study biology? I study by reading a book, going back to lecture notes and doing drawings but for some reason I just can't quite grasp the information. When im studying I feel as though I understand then it comes to taking quizzes and exams and I feel lost asf how can I retain the information better ? I thought bio would be easier than chem but I haven't even been reading for chemistry and I've been doing great what is going on with my brain T_T any tips ?

And how does this affect the absorption of certain drugs?

Hi guys. Just as title states.

Looking for something daily I can open and learn more about human biology in a micro learning fashion.

Thanks!!

It is a gram positive Rod with endospores that are subterminal. The mannitol test seemed to not work for other people that supposedly had a bacillus. I need to know the species. I believe its Bacillus Megaterium but I'm not sure. A lot of my tests are wonky because of certain circumstances. The lecithinase test had them growing for 6 days and they were put in the freezer which is making me think its a false positive.

Broth: Little to medium turbidity was seen. At the bottom a small amount of white sediment is present. There was no pellicle but there was the presence of a white ring above the broth that was easily disturbed

Slant _There was an abundant amount of growth. The color of the bacteria is beige, and it has an opaque optical property. The characteristic of the edge is filiform.

Colony Morphology (from a Streak Plate) _The size of the colony is large, and it has a beige coloring to it. The optical property of the bacteria is shiny. The surface of the colony is smooth, and the formation is circular. The elevation is raised, and the margin seems to be entire

Nitrate Reductase was positive, Cysteine desulfurase was Negative, Lecithinase was Positive, Amylase was Positive, Urease was Negative, Caseinase was Positive, Gelitinase was Positive, Citrate Permease was negative, Hemolysis seemed to be beta-hemolytic, Fermentation of Lactose is negative, fermentation of glucose was positive, VP was Negative, Ornithine and lysine carboxylase were negative (but was done wrong), Lipase was negative, mannitol salt agar was negative, Oxidase Positive, Catalase Posi

https://preview.redd.it/xis5sh3nec5e1.jpg?width=3000&format=pjpg&auto=webp&s=53619f2dd69a0a0cf53c8d98dde6ec404f0f1ace

So we all know (probably when applying hand sanitizer) that alcohol (isopropyl, ethyl) burns when applied to a wound or cut. My question is why is this the case? And I often see anti-septic solutions of 91% and 70% isopropyl alcohol in the store. Would the 91% burn worse if applied to a cut than 70% would? Or would it be about the same?

Like it knows there is cancer so F it all im gonna use every resources i have to attack everything and it becomes a resistance match who will lose first the body or the cancer cells.

According to some "experts", having pain receptors does not mean an organism can suffer, because suffering requires a more complex brain to experience.

Is this true? Does it mean some organisms can feel pain and want to avoid pain, but cannot really suffer?

Hi everyone, I’m a business student studying animal biology this semester in college to knock out some prereqs and for our final project we need to classify a bunch of critters from various phyla we covered in class. So far I have photos I took of almost all the phyla except three. So here’s where I need the help, I was hoping any of you might have photos of any type of Platyhelminthes, Nematoda, and Annelida. If you want to tell me what it is that would be nice, if not I can use what I’ve learned so far to classify it myself!

So in my lab when we have samples we have to have controls with our plates we do media control as well when new lots come in of course . Every time we have a broth we have control broths with it. Now if we had a to plate it on to the media what order do you plate in. Do you plate the controls first and then the samples? Or do you plate the samples first and do the controls last?

When I was in school I always heard you do controls first and then samples…

Apparently at my current job controls are always done last including the sterility

In winter even the basic hit on body like door know hit on hand or kicking some pole hurts much more than it should normally have been in summers. Why does this happen?

Is it just because oceans tend to have clearer water, so visual communication becomes more important? If so, wouldn't we expect more colorful fish in rivers/lakes with very clear water?

Like Giant turtles, Bowhead whales, Greenland Shark.

What is the longest lifespan recorded for fast moving animals?

Most modern classification schemes no longer consider protozoa a monophyletic kingdom, and there are even apicoplasts in Plasmodium, as well as ciliates, the group including Paramecium, having evolved from algal ancestors. Plus, ciliates and apicomplexans are within the Diaphoretickes megagroup, putting them closer to plants/other algae than to metamonads, amoebozoa, animals or fungi.

Exactly what's on the tin. Some friends and I are having an argument about it currently, but none of us are biologists. So we decided to turn to reddit for some help.

So my question is how come the maximal response be induced even when not all the receptors present are occupied by ligands?

I've seen some talk on evolution and how we cant be fully certain, and I guess asexuality wouldnt be much of a threat to our species because they reproduce less so their genes wont be passed on much. However I havent seen much talk on what exactly is different between someone who is asexual vs someone who isnt. I know there are certain hormones that cause sexual attraction and arousal, but why are some people lacking these things without any underlying conditions?

I guess I could ask all these questions about people who are aromantic as well.

EDIT: I realize now that I phrased this poorly. I am not saying that everyone who is aroace must have some underlying condition. I am aroace myself and am perfectly healthy. So clearly it exists and is very possible, but what is different in someone like me compared to someone that isnt aromantic or asexual? Is there any known difference? I know this may be a dumb question overall because not everything needs an explanation, I was just curious.

Some months I have bad menstrual cramps and some months I wouldn’t even know I was on my period if there wasn’t blood.

Some women have never experienced period cramps in their lives, or didn’t experience them until later in life (or used to have cramps and then stopped)- which would mean the action of a uterus shedding its lining, in and of itself, doesn't cause pain. So what’s going on down there?

Did I produce more prostaglandins than normal that month, and if so, why? Did the level of prostaglandins stay the same and I just had a more severe inflammatory reaction to them than usual, and if so why? Stress, diet?

There just seems to be something… missing from the research. I also understand if this is just something we simply don’t have an answer to yet.