Which structure is common to plant and animal cells?
A. chloroplast
B. central vacuole
C. mitochondrion
D. centriole
C. mitochondrion
Which scientist is credited with developing the “billiard ball” or “solid sphere” model of the atom?
A. Dalton
B. Thomson
C. Rutherford
D. Bohr
A. Dalton
Which layer of the Earth is made up of solid rock and forms the continents and ocean floors?
Crust
An object is placed 5 meters away from a plane mirror. What is the distance of the image produced from the mirror?
A. 2 meters
B. 5 meters
C. 8 meters
D. 12 meters
B. 5 meters
Which of the following macromolecules leave the nucleus of a eukaryotic cell through pores in the nuclear membrane?
A. DNA
B. amino acids
C. mRNA
D. phospholipids
C. mRNA
In the atomic model, the scientist who proposed that electrons travel in fixed orbits or energy levels around the nucleus is __________.
NIELS BOHR or BOHR
In Earth’s internal structure, what do you call the partially molten layer that lies beneath the lithosphere and is responsible for convection currents driving plate motion?
Asthenosphere
Two plane mirrors are placed at an angle to each other. If 11 images of an object are formed, what is the angle between the mirrors?
A. 18°
B. 30°
C. 36°
D. 45°
B. 30°
Which of the following represents the balanced chemical equation for photosynthesis?
A. C6H12O6 + 602 --->6C02 + 6H20
B. 6C02 + 6H20 ---> C6H12O6 + 6O2
C. 6O2 + C6H1206 --> 6H20 + 6CO2
D. 2H2 + O2 -->2H2O
B. 6C02 + 6H20 ---> C6H12O6 + 6O2
What do we call a bond formed when two atoms share electrons?
COVALENT BOND
What causes the change of seasons on Earth?
A. The distance of Earth from the Sun
B. The tilt of Earth’s axis
C. The shape of Earth’s orbit
D. The rotation of Earth
B. The tilt of Earth’s axis
Which color of light bends the least when passing through a prism?
Red