BIOLOGY - GRADE 8

Which of the following are biomolecules?

• RNA, DNA, proteins, lipids

• Proteins, lipids, carbohydrates, polymers

• Nucleic acid, lipids, carbohydrates, monomers

• Proteins, lipids, carbohydrates, nucleic acids

Tags

NGSS.HS-LS1-6

Lipids are made of

• monosaccharides
• amino acids
• glycerol and 3 fatty acids
• nucleotides

Tags

NGSS.MS-LS1-7

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Tags

NGSS.HS-PS1-4

In which part of the digestive system is the majority of water reabsorbed by the body?

• Stomach

• Small Intestine

• Oesophagus

• Large Intestine

In order to make proteins, plants need to absorb

• Magnesium Ions

• Nitrate Ions

• Sucrose

• Carbon Dioxide

Tags

NGSS.HS-LS1-6

Part of the leaf which allows the diffusion of gases to occur

• Palisade Cells

• Spongy Mesophyll Cells

• Epidermis

• Phloem

An example of adhesion is

• Water molecules sticking to each other
• Water molecules sticking to cellulose in xylem walls
• Magnets sticking to a metal wall
• Gravity pulling water down

Tags

NGSS.HS-ESS2-5

How do mineral ions enter a plant?

• by osmosis in root hair cells

• by active transport in root hair cells

• through the stomata

• through the roots