This post is part of a miniseries on genetics. Be sure to check out the other posts in this series that you may have missed.
Credit: NIGMS.
In our miniseries on genetics, we’ve introduced the genome and how variants in DNA affect us. We’ve also discussed how people inherit genetic information and the way genes are expressed, as well as common tools researchers use to study DNA. We hope you’ve paid close attention because it’s time to test your knowledge of genetics! Take our quiz below, and let us know how many questions you answered correctly.
A hydra captured under a microscope. Credit: iStock.
Hydras might look like they’re visitors from outer space, but they’re actually Earth-dwelling animals that can be found in fresh water, like ponds or gentle streams. The body of a hydra consists of a thin tubelike stalk that’s about an inch long with several tentacles extending from one end. Some hydras can grow an armlike extension that eventually pops off the main stem to become a new hydra.
Humans have studied hydras for hundreds of years. Antonie van Leeuwenhoek, one of the earliest known microscopists, first described them in 1703 when he looked at water samples under a microscope. You can see hydras—whose bodies are about the length of a paperclip—without them, but microscopes help researchers see their shape in better detail. Scientists commonly use hydras as research organisms because of their incredible ability to regrow lost body parts after injury through a process called regeneration.
This adult Hawaiian bobtail squid swimming in front of a submerged hand illustrates its small size. Credit: The labs of Margaret J. McFall-Ngai, Carnegie Institution for Science/California Institute of Technology, and Edward G. Ruby, California Institute of Technology.
The Hawaiian bobtail squid (Euprymna scolopes) is only about as big as a golf ball, but what it lacks in size, it makes up for in its superpower—an invisibility cloak to be exact. Thanks to its symbiotic relationship with the bioluminescent bacteriaVibrio fischeri, it’s able to seemingly disappear from its predators when swimming at night.
These super-squid live in the shallow coastal waters in the Pacific, like those around the Hawaiian Islands. They’re nocturnal, so they hunt their prey—small shrimp and other crustaceans—at night and hide, often by burying themselves in the sand, during the day while they rest. Although Hawaiian bobtail squid live their short 3-10 month lives around one another, they generally only interact for breeding, and even then, they only reproduce once in their lifetimes and die soon after reproduction.
Have you ever noticed plastic utensils or paper plates labeled as “biodegradable” and wondered what that meant? Materials are biodegradable when microorganisms such as bacteria can break them down into their building blocks.
This post is part of a miniseries on the immune system. Be sure to check out the other posts in this series that you may have missed.
Credit: NIGMS.
Throughout our immunologyminiseries, we introduced the immune system and its many functions and components. Additionally, we highlighted how vaccines train your immune system, how the system can go awry, and how NIGMS-supported researchers are studying immunology and infectious diseases. Put your knowledge about the immune system to the test by taking the quiz below.
The friendly-looking axolotl (Ambystoma mexicanum) doesn’t seem to have much in common with its namesake, Xolotl—the Aztec god of lightning, death, and fire. In fact, axolotls can regrow lost limbs and other body parts like organs and parts of their central nervous systems—which goes against the concept of death!
Andrew G. Campbell, Ph.D., a professor of medical science at Brown University in Providence, Rhode Island, and previous dean of the graduate school, is passionate about researching understudied diseases and helping students reach their full potential.
Dr. Campbell’s lab has studied the single-cell organismTrypanosoma brucei (T. brucei), a parasite transmitted through the bite of the tsetse fly, which is only found in specific regions of Africa. In humans, T. brucei causes African Trypanosomiasis, also known as sleeping sickness. Symptoms of this illness include headache, weakness, tiredness, and altered sleep schedules; and if left untreated, it can be fatal. Dr. Campbell studies the function of certain enzymes found in T. brucei and other infectious agents, like hepatitis B virus and HIV, with the hope that they can serve as targets for new treatments for diseases.
Two NIGMS-funded programs are teaming up to shape the future of science and technology in West Virginia (WV). One engages high school students in science, technology, engineering, math, and medicine (STEM+M); introduces them to research; and provides direct access to college through tuition waivers. In the other program, undergraduate students are paired with a researcher at their institution for a paid internship—an important step toward a career in science.
Those pesky little bugs flying around the overripe bananas in your kitchen may hold the key to understanding something new about how our bodies work. That’s right, the fruit fly (Drosophila melanogaster) is a widely used research organism in genetics because of its superpower of reproducing quickly with similar genes to people.
Researchers have been studying fruit flies for over a century for many reasons. First, they’re easy to please—just keep them at room temperature and feed them corn meal, sugar, and yeast (or those bananas on your counter!). Second, they reproduce more quickly and have shorter life cycles than larger organisms. A female can lay up to a hundred eggs in a day, and those eggs develop into mature adult flies within 10 to 12 days. A third reason is the simplicity of the fruit fly’s genome, which only has four pairs of chromosomes compared to the 23 in humans. And on a logistical note, the male and female flies are easy to tell apart (genetic studies often require separating males and females, which isn’t an easy feat in all organisms).
“Many of the students we work with don’t have access to a laboratory through their local schools. For them, CityLab is their first exposure to a laboratory environment—these are hugely important moments for these kids,” says Carl Franzblau, Ph.D., the founder of CityLab at Boston University (BU). CityLab was established more than 30 years ago as a science education outreach program for precollege students and teachers through a partnership between the Chobanian & Avedisian School of Medicine and the Wheelock College of Education & Human Development at BU.
“Since our first Science Education Partnership Award (SEPA) grant in 1991, our mission has been to inspire students to consider careers in the biomedical sciences and broaden the opportunities that are available to them,” says Carla Romney, D.Sc., the director of research for CityLab. Continuous SEPA funding since 1991 has allowed CityLab to fulfill its mission and provide students with state-of-the-art biotechnology laboratory facilities and curricula.
