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The shape of DNA is best described as:
D) Double helix
An example of an organism that reproduces asexually is:
Amoeba
Which process results in greater genetic variation?
C) Sexual reproduction
Asexual reproduction results in offspring that are:
B) Genetically identical
What is the function of the cell membrane?
B) Control what enters and exits the cell
Which statement about prokaryotic cells is true?
D) They do not have a nucleus
Which organelle is known as the powerhouse of the cell?
Mitochondria
Which of the following structures is found in both plant and animal cells?
C) Nucleus
In chromatography, what causes the different substances to separate?
A) Solubility and particle size
Which method would best separate salt from saltwater?
C) Evaporation
What happens to particles in a substance as it is heated?
B) They move faster
Which of the following is a physical change?
C) Melting ice
Which group on the periodic table contains elements that are very reactive metals?
A) Group 1
What is the correct electron configuration for oxygen (atomic number 8)?
B) 2, 6
Which experiment led to the discovery of the nucleus?
A) Gold foil experiment
What did Dalton believe about atoms?
C) They are indivisible and unique for each element
In Bohr’s model, electrons orbit the nucleus in:
Shells
Which subatomic particle defines the atomic number?
Proton
What is the charge of a neutron?
Neutral
Which of the following is NOT a safe lab practice?
C) Eating during a lab
What does a yellow triangle with a black flame symbol indicate?
Flammable substance
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