1 Amino acids are linked together by: A Hydrogen bonds B Ionic bonds C Peptide bonds D Disulfide bonds
2 Balanced diet must contain: A Only carbohydrates B Only proteins C All essential nutrients D Only vitamins
3 Scientific data should be recorded: A Later from memory B Accurately at the time C Roughly D Without units
8 Which statement best describes a conclusion? A A guess before experiment B A summary based on data C Raw data D A hypothesis
12 Biochemistry is the study of: A Chemical reactions in industries B Chemicals present in living organisms C Atomic structure D Environmental pollution
15 Which improves accuracy of an experiment? A Faulty instruments B Careful measurement C Guessing values D Ignoring errors
16 A fair test requires: A Multiple independent variables B Controlled conditions C No measurements D Assumptions
21 Accuracy refers to how close a measurement is to: A Other measurements B The true value C Zero D Maximum value
22 Repeated trials in an experiment help to: A Increase error B Reduce reliability C Improve reliability D Change hypothesis
23 Which unit should be included with measurements? A Optional B SI units C Local units only D No units
24 Qualitative data is best described as: A Numerical values B Measurements C Descriptions or observations D Graphs only
25 Which tool is commonly used to collect experimental data? A Dictionary B Balance C Notebook D Calculator
26 Which disease is caused by deficiency of vitamin B1? A Scurvy B Rickets C Beriberi D Night blindness
28 Which variable is deliberately changed in an experiment? A Dependent variable B Controlled variable C Independent variable D Constant
30 Measurements can be precise but not accurate when they are: A Close to true value B Repeated but incorrect C Random D Unmeasured