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Dr. Ajna Rivera
United States
Приєднався 12 гру 2010
Original videos and playlists by Dr. Ajna Rivera, Biological Sciences, University of the Pacific for my Evolution, Genetics, and Intro Bio courses.
Students, please request new videos by emailing me! Visit my office hours for more details or further explanation.
Learn more about my great school at:
www.pacific.edu
Students, please request new videos by emailing me! Visit my office hours for more details or further explanation.
Learn more about my great school at:
www.pacific.edu
Відео
dissecting an ostracod
Переглядів 184Рік тому
Sorry about the terrible background noise, the -80 condenser turned on right when I started and I was at the scope next to it 😳
Exergonic vs endergonic reaction diagrams
Переглядів 6 тис.2 роки тому
ERROR: I keep saying deltaG when I just mean G (Gibbs free energy). The delta is referring to the change. The axis is just G and deltaG is the difference between the reactants and the products.
Chi square test for biology (super simple intuitive version)
Переглядів 452 роки тому
Chi square test for biology (super simple intuitive version)
Campbell biology Hybrid Zones and Speciation
Переглядів 1,5 тис.2 роки тому
Campbell biology Hybrid Zones and Speciation
Hardy Weinberg part 2: genotype and phenotype
Переглядів 432 роки тому
Hardy Weinberg part 2: genotype and phenotype
Hardy Weinberg part 3: solving a problem
Переглядів 542 роки тому
Hardy Weinberg part 3: solving a problem
Hardy Weinberg part 1: what do p and q mean?
Переглядів 572 роки тому
Hardy Weinberg part 1: what do p and q mean?
Tetrapod limb development: early theory
Переглядів 2023 роки тому
This is a simplified version of the model proposed in 1979 by Newman and Frisch. It explains the development of the "big bone, two parallel bones, lots of little bones" pattern discussed in Your Inner Fish. This is the pattern that we see in the land vertebrates (and marine mammals). This model invokes a Turing mechanism that allows the limb to self-pattern with only a small number of dynamic m...
Setup for Floating Leaf Disc Experiment
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Setup for Floating Leaf Disc Experiment
Gene Regulatory Evolution: Intro to Theory
Переглядів 3383 роки тому
Gene Regulatory Evolution: Intro to Theory
California biomes: Riparian Oak Forest
Переглядів 4714 роки тому
California biomes: Riparian Oak Forest
Starch & polymers both of glycogen.
first tree
😑
Thanks to you, I was able to do these types of problems on my exam and was saved from panicking. Thank you!
It seems that God changes it for you, or, maybe, a "Jesus, for others," circumstance, possibly like a Virgilian pathway, posssibly (e.g. A personal integral ecology within an intergenerational economy of salvation?). I'm adding this thought to this discussion because I do not believe that God evolves. How about this: ua-cam.com/video/4o8mGHN9t10/v-deo.htmlfeature=shared
Thank you ❤
The smoothest explaining literally. Thank you, and Merry Christmas& Happy new year btw!
thank you!
nice and thanks
Thank you, great video! 💕
this helped so much! thank you.
A lot of beautiful scenes and interesting details, but other than the first and last image, the majority of this video details grassland and conifer habitat, not chaparral.
Great point, Red Hills is considered chaparral because the dominant species are the fire and drought resistant shrubs that typically make up chaparral. Sierra foothills chaparral ecosystems look very different from those found in Southern California, which almost completely lack trees. In the Sierra Foothills and Coastal Northern California, Conifers or Oak trees are common members of the chaparral biome. Hope this is helpful info for you!
If you want to see a conifer-dominanted habitat check out my video on the Taiga
@@ariverapacific Thanks for the reply! You're definitely correct that there are some pines found in central and northern chaparral, in particular Pinus sabinana in the Sierra foothills and serotinous Coulter pines further south, but they are sparsely scattered and are more of an oddity than a significant component. All along the western slope of the Sierra Nevada foothills there's large stands of chamise chaparral where pines dare not tread. In wetter, mountainous areas like Humboldt and southern Oregon you'll find chaparral species like manzanita under conifers, but those areas are considered forest rather than chaparral. Oaks once were significant components of sage scrub shrublands, particularly along the central coast, but much of this combo has been destroyed by overgrazing and too many fires. No one has ever definitively quantified how many trees a chaparral habitat can have before it is no longer chaparral, but generally speaking, chaparral is dominated by shrub species that form a contiguous canopy. Nature doesn't like lines, but by definition, trees are outliers in chaparral.
THANK YOU SO MUCH FOR THESE SERIES
thank you!
california is like minecraft. it has literally every biome
Good job
It would have been nice to explain more why it is antiparallel nature, just saying it is antiparallel without explaining it leaves you confused
Thank you for your explanation!
Very helpful.. Thank you🥰
why did you not mention the protonemal stage
We Love You Ma,am From Pakistan *🍀🌻🌼🌺😍😍😍🐳🌻🌼🙏
Hello, madam I want to know whether the molar ratio of sugar links (glycosidic linkage)can be calculated through methylation analysis. If so, how to calculate it?
Thank you a lot 💖💖💖💖
I really like this video and understand very well 👍👍👍👍
I'm not in the class but am very curious, why are the flowers yellow?
there could be multiple reasons, the one that is relevant to my course is that they could be attracting the same local pollinators!
@@ariverapacific That makes sense. I just started taking a horticulture certification course. It's a fun topic to learn about.
this makes so much sense thank you
Carbonyl not carboxyl
so u not gonna tell which is most parsimonious?
supposedly, the tree that has less base change events (tick marks) is the parsimonious
@@amylopez89 appreciate it
thanks
The easiest trick to remember is the opposite end of atom O , where hydroxyl group is "odd man out "
A key thing to mention is that both haploid and diploid cells can undergo Mitosis.
Fantastic
Thank you ! :D
thank you very much! this is so useful and very easy to understand.
I was wondering if in Campbell ch 19 there is a section which discusses about viroids?
would the first tree be the most parsimonious?
I like it
so is it correct to assume that (given the fact that DNA replication is bidirectional) whichever strand we look at, it has always a leading section and a lagging section?
Yes that's right! Ends of chromosomes are replicated a little bit differently, using telomerase in eukaryotes.
This was very helpful to my A/L biome lesson. Thank you. 🙂🙏
Me too
Me too
Srilankan?
@@002mi2 yes
Same!
NICE ANALYSIS
How does expression of O, P and Q increase when cro inhibits the PR promoter?
cro only inhibits Pr after the O, P, and Q genes have been transcribed
In part 2 you said CI inhibits the promoters PL and PR to prevent transcription of the lytic genes. However in this video you said that CI activates the PL and PR promoters, so I'm confused what effect does CI actually have on these promoters?
Thanks for the video ❤️
Thanks one of the few ones that show complete replication bubble
Thanks for patiently slowly taking us go thru this step by step, it's been driving me nuts for doing this problem, now after watching your vdo is much clear now! :"D Thank you Dr Ajna!
I really liked the class a lot!
Hi Dr Ajna, could you please contact me its Emergency boodgh0@gmail.com
Thank you, I'm studying in eighth grade, and we've taken almost the same thing💕💕💕💕
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