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Tenth Grade (Grade 10) Science Questions

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Grade 10 :: Cell Theory by MarcBeinder
Which structure is primarily responsible for directing ALL processes of a plant cell?
  1. chloroplast
  2. lysome
  3. mitochondria
  4. nucleus
Grade 10 :: Atomic Structure by Melloni
Thallium has two isotopes, thallium-203 and thallium- 205. Thallium's atomic number is 81, and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?
  1. There is more thallium-203 in nature
  2. Atoms of both isotopes have 81 protons
  3. Thallium-205 atoms have fewer neutrons
  4. The most common atom of thallium has a mass of 204.38 amu.
Grade 10 :: Cell Theory by MarcBeinder
What is the MAIN function of a selectively permeable membrane?
  1. storage of water
  2. storage of chemicals
  3. breaks down molecules within the cell
  4. regulates what enters and leaves the cell
Grade 10 :: Biochemistry by MarcBeinder
A strand of DNA is exposed to intense heat. Which of these BEST decribes what will happen to the strand of DNA?
  1. The chemial bonds of the DNA molecule will be broken
  2. More nitrogen base pairs will add on to the DNA molecule
  3. The chemical bonds of the DNA molecule will be strengthened
  4. The nitrogen base pairs in the DNA molecule will switch places
Grade 10 :: Biochemistry by MarcBeinder
What is the role of hydrogen bonds in the structure if DNA?
  1. to code for proteins
  2. to synthesize proteins
  3. to seperate the strands
  4. to connect the base pairs
Grade 10 :: Nervous and Endocrine Systems by LBeth
The overall function of the body's nervous system is
  1. processing nutrients and removing waste
  2. providing structural support and movement
  3. regulating transportation and defense mechanisms
  4. coordinating communication, integration, and regulation
Grade 10 :: Atomic Structure by Melloni
Which of these descriptions is incorrect?
  1. proton: positive charge, in nucleus, mass of = 1 amu
  2. electron: negative charge, mass of = 0 amu, in nucleus
  3. neutron: mass of = 1 amu, no charge
Grade 10 :: Evolution by MarcBeinder
The papaya mealybug is a pest that poses a threat to many tropical plants. Which fate of the mealybug would result from the inablility of the species to reproduce?
HINT : EVOLUTION
  1. The species would mutate
  2. The species would increase
  3. The species would become extinct
  4. The species would continue to thrive
Grade 10 :: Biochemistry by medicaljedi
A biological polymer made of bonded amino acids.
  1. Protein
  2. amino acid
  3. DNA
  4. sugar cube
Grade 10 :: Cell Theory by mrsbateacher
The structures that synthesize proteins in cells are the
  1. ribosomes
  2. Golgi apparatus
  3. lysosomes
  4. vacuoles
Grade 10 :: Evolution by MarcBeinder
A population of salamanders that live in a river require clear, fresh water to survive. A flood causes tons of sediment to be suspended in the river. Which of these MOST LIKELY will happen to the salamander population?
HINT : EVOLUTION
  1. the salamanders will adapt to life on land
  2. the salamanders will move to another river
  3. the salamanders will adapt to living in the muddy water
  4. the salamanders will decrease in number because of the water quality
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