DNA Structures and Species Navigation

Emily Grassley discusses various scientific topics, including efforts to catalog all species on Earth by 2100, dung beetles navigating using the Milky Way, a historical radiation burst in 775 CE, and the discovery of DNA quadruplexes. The video highlights the importance of taxonomy, the intelligence of dung beetles, the potential causes of ancient radiation, and new insights into DNA structure.

Who is filling in for Hank Green in this episode?

• Emily Grassley

• Robert May

• Michael Aronda

• Mark Costello

What is the estimated number of species that scientists believe exist on Earth?

• 100 million

• 20 million

• 5 million

• 1.9 million

What is the main challenge in cataloging all species on Earth?

• Lack of interest

• Too many species

• Insufficient technology

• No funding

How do dung beetles navigate at night?

• By Earth's magnetic field

• By the Milky Way

• By the Sun

• By the Moon

What did researchers use to test dung beetles' navigation abilities?

• A telescope

• A planetarium

• A microscope

• A GPS device

What unusual event occurred around 774 or 775 CE?

• A burst of radiation

• A volcanic eruption

• A solar eclipse

• A meteor shower

What is one proposed cause of the 8th-century radiation burst?

• A volcanic eruption

• A comet impact

• A coronal mass ejection

• A supernova

What new DNA structure was discovered by researchers at Cambridge University?

• Triple helix

• Quadruplex

• Hexaplex

• Pentaplex

In which type of cells are DNA quadruplexes most commonly found?

• Nerve cells

• Muscle cells

• Rapidly dividing cells

• Fat cells

What potential medical application could DNA quadruplexes have?

• Preventing heart disease

• Curing Alzheimer's

• Tracking cancer growth

• Treating diabetes