Daily Trivia Quiz - Day 249 (2026-07-18)

Question 1

Why must a cell copy its DNA before division instead of filling in the missing parts afterward?

Accepted Answer

Both daughter cells need a complete set of genetic information

Answer

Copying DNA makes the cell smaller during division

Answer

It prevents the cell membrane from swelling with water

Answer

It stops mitochondria from making ATP

Question 2

Saxaul shrubs seem to have almost no leaves. What is the point of reducing leaves to tiny scales?

Accepted Answer

It cuts water loss and shifts more photosynthesis to green stems

Answer

It expands leaf area for fast cooling at noon

Answer

It makes salt crystallize mainly along leaf edges

Answer

It means the roots no longer need to search deeply for water

Question 3

Why is worn knee cartilage often harder to repair than a skin scrape?

Accepted Answer

Cartilage has very few blood vessels, so repair resources arrive slowly

Answer

Cartilage cells always divide faster than skin cells

Answer

Cartilage gets its nutrients mainly through nerves

Answer

Injured cartilage immediately turns into bone

Question 4

The cornea sits at the front of the eye. Why is it not clouded by blood vessels?

Accepted Answer

Its collagen is ordered and it has almost no blood vessels

Answer

It contains many red blood cells, but they are pale

Answer

Its blood vessels actively avoid only the pupil area

Answer

It stays transparent by absorbing stray light with melanin

Question 5

Why is it harder for the inner grooves of a vinyl record to preserve the same detail?

Accepted Answer

The inner groove has lower linear speed, so less groove length is available per second

Answer

Inner-groove sound must pass through the center hole first

Answer

The inner material is softer than the outer material

Answer

The needle stops moving side to side near the center

Question 6

Why does taking calcium not mean every bit of it goes straight into your bones?

Accepted Answer

Calcium absorption and bone deposition also depend on vitamin D, hormones, and exercise

Answer

Calcium enters teeth but not bones

Answer

Calcium must first become protein before absorption

Answer

Calcium absorption depends only on food color

Question 7

Why can iron deficiency make people tired, beyond simply having 'less blood'?

Accepted Answer

Iron helps hemoglobin carry oxygen and supports some energy-metabolism enzymes

Answer

Iron mainly emulsifies fat into tiny droplets

Answer

Iron is the body's main form of fat storage

Answer

Iron only provides structural support in bones

Question 8

Why do some Namib Desert beetles have a mix of water-loving and water-repelling areas on their backs?

Accepted Answer

It helps fog condense into droplets and roll toward the mouthparts

Answer

It heats the back to drive away predators

Answer

It makes sand stick into a protective shell

Answer

It moves excess salt onto the back spots

Question 9

Why do recording studios use acoustic panels instead of just making the walls thick?

Accepted Answer

Thick walls block sound transmission; panels control reflections inside the room

Answer

Acoustic panels mainly stop sound from reaching the next room

Answer

Thick walls mainly reduce echo inside the room

Answer

Acoustic panels turn indoor reflections into higher pitches

Question 10

A cell nucleus is tiny. How is genetic material packed so efficiently inside it?

Accepted Answer

DNA wraps around histones and folds into more compact structures

Answer

Genetic material floats loosely throughout the whole cell

Answer

The nucleus seals each chromosome into a separate vesicle

Answer

Genetic material enters the nucleus only when genes are needed