How often can someone donate whole blood?
Every 56 days
What part of the brain controls balance and coordination?
The cerebellum
Why do leaves change color in the fall?
Chlorophyll breaks down, revealing other pigments.
What star is closest to Earth?
The Sun
What positively charged particle is found in the nucleus of an atom?
A proton
What is the universal donor blood type?
O negative
What is the longest bone in the human body?
The femur
What is the name of the full moon closest to the autumnal equinox?
Harvest Moon
What telescope has provided deep-space images since 1990?
The Hubble Space Telescope
What is the name for a substance that speeds up a chemical reaction without being consumed?
A catalyst
What is plasma commonly used for in medicine?
To treat clotting disorders and burn victims
What structure connects muscles to bones?
Tendons
Which pigment becomes more visible in leaves during fall as chlorophyll breaks down, giving leaves their yellow color?
Carotenoids
What is the term for the apparent backward motion of planets as observed from Earth?
Retrograde motion
What type of reaction releases heat?
Exothermic reaction
What is the minimum hemoglobin level required to donate blood?
12.5 g/dL for women, 13.0 g/dL for men
What part of the nervous system controls involuntary actions like heartbeat and digestion?
Autonomic nervous system.
What is the scientific term for leaf shedding?
Abscission
What is the name of the region beyond Neptune that contains icy bodies and dwarf planets like Pluto?
Kuiper Belt
What is the number of protons in a carbon atom?
6
What rare blood type is known as the "golden blood"?
Rh-null blood type
What type of joint is found in the shoulder and hip?
Ball-and-socket joint.
What hormone helps trees shed their leaves?
Ethylene
What is the name of the boundary around a black hole beyond which nothing can escape?
Event horizon.
What does the reaction name "SN2" stand for?
Substitution Nucleophilic Bimolecular