Molecular Biology (4.1 and 4.2) Practice

What is the role of DNA in protein synthesis?​ ​ (a)  

• To determine the sequence of amino acids
• To transfer amino acids to the ribosomes
• To help form the peptide bonds between amino acids
• Carry code for the amino acids to ribosome

Tags

Bio.4.1.2

Which cell structure is MOST RESPONSIBLE for regulating protein synthesis?

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Bio.4.1.2

In the case of sickle cell anemia, which is a disease caused by the protein hemoglobin being sickle shaped instead of round, what determined the proteins shape?

• The size of the nucleic acid DNA

• Nucleotide sequence in the DNA molecule

• Nucleotide sequence in the RNA molecule

• The size of the nucleic acid RNA

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Bio.4.1.2

Which double stranded molecule stores genetic information in cells?

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Bio.4.1.2

Match the following

• Lipid

• Which organic molecules building block is an amino acid?

• Protein

• Which molecule stores information related to the function of a cell in the form of a coded message?

• Carbohydrate

• Which organic molecule is insoluble in water, stores energy, and insulates

• Nucleic Acids

• Which organic molecules building block is a monosaccharide?

Which substance acts as a catalyst for metabolism?

• Enzymes

• Hormones

• Nucleic Acids

• Vitamins

The enzyme lactase breaks down the carbohydrate lactose into the monosaccharides glucose and galactose. The enzyme lactase however, does not break down the carbohydrate sucrose. What​ can be inferred about enzymes? ​ (a)  

• They can only act on certain substances
• They consist of monosaccharides
• They become part of the chemical reaction
• They decrease the rate of reactions

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

Tags

Bio.4.1.2

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 .
  

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Bio.4.1.2

What will most likely happen if the level of carbon dioxide available to a plant is reduced?

• The plant will take in more water

• The plant will take in less nitrogen

• The plant will produce more oxygen

• The plant will produce less glucose

Tags

Bio.4.1.2