Collegebiology

We found 19 articles

The eukaryotic cell cycle and its checkpoints
The cell is the fundamental unit of life. Multicellular organisms are composed of many cells; in the case of human beings, trillions of them! But every human being arises from one single cell. To form a body composed of so many cells, cells must replicate themselves. To do so – they undergo a program of growth and division.
What is structural biology (and why should you care)?
Within all of our cells, we have millions of proteins, nucleic acids, lipids, and carbohydrates serving various biological functions. Many of these molecules have structure which play key roles in understanding how the mechanisms of those biological functions work. Scientists who study structural biology seek to determine the structure of these ...
Breaking down the brachial plexus
These three words are enough to strike fear into the heart of even the most intrepid anatomy, pre-clinical, or clinical student. There’s so many nerves, some in front and some behind, some looping around – it’s easy to get tripped up trying to make sense of this complex structure.
To biologists – why we should love math
The mention of mathematics often evokes mixed emotions among biologists. While some embrace it as a powerful tool, most merely view it as a black box for their collaborators to navigate for them or as intimidating and unrelated to their study. However, as a Biology PhD student, I firmly believe that math is not scary and an essential and ...
Evolution is mostly random
Competition in nature is relentless. Predation, famine, disease, and disaster all threaten to prevent individuals from reproducing. In this competitive environment, mutations that make survival more likely are more likely to appear in future generations, and mutations that make survival less likely probably won’t stick around in the population for ...
An introduction to action potentials
Have you ever wondered how our brains work? Our every thought, every emotion, and every movement are generated by our brain through a vast network of cells called neurons. Neurons make connections and talk to each other through electrical signals called action potentials.
The next-generation of DNA sequencing: understanding modern genomics technologies
On October 21st, 2004, the International Human Genome Sequencing Consortium published a near-complete draft of the human genome, a 100 million dollar initiative to understand the genetics of our species. By 2022, the cost to sequence the human genome neared $1000. This drastic price reduction has led to new advancements in understanding cellular ...
How algorithms changed my perspective on biology
When I first started studying biology, I thought the discipline was mostly about memorizing facts and figures about different organisms and their characteristics. In high school, I was more interested in physics and chemistry, which seemed to involve learning general principles and laws that could be applied to many problems. In other words, I ...
Breaking down glycolytic regulation
You can stare at or redraw the pathway for glycolysis to memorize it, but obtaining a deeper understanding of cellular and tissue metabolism requires an understanding of the regulatory mechanisms governing glycolysis. Below you can find a figure of the steps for glycolysis as a reference as we discuss the regulation.
How to tell the difference between mitosis and meiosis
If you’ve ever taken a biology class, you’ve most likely come across the concept of the cell cycle. Put simply, the cell cycle is the growth of cells, the replication of DNA, and the subsequent division of DNA, organelles, and cytoplasm that creates new cells. For eukaryotes, cell division is an essential part of both growth and reproduction. ...
A brief primer on the secretory pathway
The secretory pathway is arguably one of the most important pathways in the body. It deemed ‘Secretory’ primarily because it’s the pathway that controls how the cell secretes proteins int extracellular environment.
Tips for studying biology
I am often asked the question, “Brooke how do you study for biology?” We know to use practice problems to study for physics, or pathway diagrams for chemistry, but biology is different: it is a lot of memorizations!
Hormones of the female reproductive system
The female reproductive system can at times feel like a difficult jumble of hormones that all seem to be related, but fluctuate in unpredictable ways. To make sense of the particularities of the female reproductive system, especially for exams like the MCAT, it is important to not only know what hormones are involved, but also to understand what ...
Gametogenesis and spermatogenesis and oogenesis, oh my!
Meiosis is one of those processes that we all learned about in high school biology as a deceptively simple concept. You take the diploid cell, divide it twice, and it becomes four haploid gametes that are each capable of participating in fertilization. Easy, right?
Pituitary gland hormones made simple
What is the pituitary gland? Even though the pituitary gland is about the size of a pea, it plays a very important role in regulating a lot of our body’s endocrine functions. Located in an area known as the sella turcica at the base of the brain and suspended from the hypothalamus by a stalk, the pituitary gland consists of two parts: the ...
What are lymphocytes? A guide to your immune system
The immune system is designed to prevent disease and fight infection and is critical for human survival. It specializes in the ability to attack foreign microorganisms, but what stops your immune system from eating you alive? Given that cells of the immune system can essentially eat microorganisms, you may be wondering what mechanisms are in place ...
How do enzymes work? Catalytic strategies and models of substrate fit
In this post, we are going to do a brief Q and A to review what enzymes do and how they work. This post will be slightly beyond a basic introduction so it is probably most appropriate for a student who already has a sense of what enzymes are.
What is the phospholipid bilayer and what determines its fluidity?
All cells are surrounded by a cell membrane that forms a barrier between the cell and its surroundings. This membrane is often referred to as the phospholipid bilayer. As you can probably tell from the name, a phospholipid bilayer is made up of two layers of lipids. The fluidity of this membrane must be maintained within a certain range for the ...
topicTopics
academics study skills MCAT medical school admissions SAT expository writing college admissions English MD/PhD admissions strategy writing LSAT GMAT GRE physics chemistry math biology graduate admissions academic advice ACT interview prep law school admissions test anxiety language learning premed MBA admissions career advice personal statements homework help AP exams creative writing MD study schedules computer science test prep Common Application summer activities history mathematics philosophy organic chemistry secondary applications economics supplements research 1L PSAT admissions coaching grammar law psychology statistics & probability legal studies ESL CARS SSAT covid-19 dental admissions logic games reading comprehension engineering USMLE calculus PhD admissions Spanish mentorship parents Latin biochemistry case coaching verbal reasoning DAT English literature STEM excel medical school political science skills AMCAS French Linguistics MBA coursework Tutoring Approaches academic integrity chinese letters of recommendation Anki DO Social Advocacy admissions advice algebra artificial intelligence astrophysics business cell biology classics diversity statement gap year genetics geometry kinematics linear algebra mechanical engineering mental health presentations quantitative reasoning study abroad technical interviews time management work and activities 2L DMD IB exams ISEE MD/PhD programs Sentence Correction adjusting to college algorithms amino acids analysis essay art history athletics business skills careers cold emails data science dental school finance first generation student functions information sessions international students internships logic networking poetry resume revising science social sciences software engineering tech industry trigonometry writer's block 3L AAMC Academic Interest EMT FlexMed Fourier Series Greek Health Professional Shortage Area Italian Lagrange multipliers London MD vs PhD MMI Montessori National Health Service Corps Pythagorean Theorem Python Shakespeare Step 2 TMDSAS Taylor Series Truss Analysis Zoom acids and bases active learning architecture argumentative writing art art and design schools art portfolios bacteriology bibliographies biomedicine brain teaser campus visits cantonese capacitors capital markets central limit theorem centrifugal force chemical engineering chess chromatography class participation climate change clinical experience community service constitutional law consulting cover letters curriculum dementia demonstrated interest dimensional analysis distance learning econometrics electric engineering electricity and magnetism escape velocity evolution executive function freewriting genomics graphing harmonics health policy history of medicine history of science hybrid vehicles hydrophobic effect ideal gas law immunology induction infinite institutional actions integrated reasoning intermolecular forces intern investing investment banking lab reports linear maps mandarin chinese matrices mba medical physics meiosis microeconomics mitosis mnemonics music music theory nervous system neurology neuroscience object-oriented programming office hours operating systems