Blood Donation
Human Anatomy
Fall
Space and Astronomy
Chemistry Basics
100

How often can someone donate whole blood?

Every 56 days

100

What part of the brain controls balance and coordination?

The cerebellum

100

Why do leaves change color in the fall?

Chlorophyll breaks down, revealing other pigments.

100

What star is closest to Earth?

The Sun

100

What positively charged particle is found in the nucleus of an atom?

A proton

200

What is the universal donor blood type?

O negative

200

What is the longest bone in the human body?

The femur

200

What is the name of the full moon closest to the autumnal equinox?

Harvest Moon

200

What telescope has provided deep-space images since 1990?

The Hubble Space Telescope

200

What is the name for a substance that speeds up a chemical reaction without being consumed?

A catalyst

300

What is plasma commonly used for in medicine?

To treat clotting disorders and burn victims

300

What structure connects muscles to bones?

Tendons

300

Which pigment becomes more visible in leaves during fall as chlorophyll breaks down, giving leaves their yellow color?

Carotenoids

300

What is the term for the apparent backward motion of planets as observed from Earth?

Retrograde motion

300

What type of reaction releases heat?

Exothermic reaction

400

What is the minimum hemoglobin level required to donate blood?

12.5 g/dL for women, 13.0 g/dL for men

400

What part of the nervous system controls involuntary actions like heartbeat and digestion?

Autonomic nervous system.

400

What is the scientific term for leaf shedding?

Abscission

400

What is the name of the region beyond Neptune that contains icy bodies and dwarf planets like Pluto?

Kuiper Belt

400

What is the number of protons in a carbon atom?

6

500

What rare blood type is known as the "golden blood"?

Rh-null blood type

500

What type of joint is found in the shoulder and hip?

Ball-and-socket joint.

500

What hormone helps trees shed their leaves?

Ethylene

500

What is the name of the boundary around a black hole beyond which nothing can escape?

Event horizon.

500

What does the reaction name "SN2" stand for?

Substitution Nucleophilic Bimolecular

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