Biochemistry 2021 Quiz PDF

Preview

Summary

Quiz...

Description

Name: ______________________________

Date: ___________________

Period:_________

Biochemistry Quiz 1.

_______

Which is the MOST valid conclusion based on this graph? a. Enzymes are not affected greatly by temperature. b. Enzymes work most effectively at low temperatures. c. Raising the temperature always makes an enzyme work better. d. Enzyme function decreases after a certain favorable temperature.

2.

_______

The enzymes that catalyze cellular reactions are macromolecules made of organic compounds composed of carbon, hydrogen, oxygen, and nitrogen. These types of macromolecules are known as a. starches b. sugars c. proteins d. fats

3.

_______

Many plants have waxy coatings on some surfaces. This coating reduces water loss because it is not water-permeable. This waxy coating is which of the following types of organic molecule? a. carbohydrate b. lipid c. nucleic acid d. protein

4.

_______

Many land plants store energy in starch. When energy is needed, the starch molecules can be broken down quickly. This chemical reaction produces which of the following? a. amino acids b. lipids c. monosaccharides d. RNA chains

5.

_______

Which of the following macromolecules are a prominent part of animal tissues that function in insulation, helping animals conserve heat? a. carbohydrates b. lipids c. proteins d. nucleic acids

6.

7.

_______ Which of the following are commonly found in organic molecules? I. Carbon II. Nitrogen III. Phosphorus IV. Helium A I,II B II,IV C I, II, III D I, II, III, IV _______ Using the data below regarding the presence of elements in the human body, which element is NOT present in most enzymes. Element Oxygen Carbon Hydrogen Nitrogen Magnesium a. b. c. d.

8.

_______

Presence in Human Body 65% 18% 10% 3% .05%

oxygen carbon hydrogen magnesium

You are testing food solutions for carbohydrates, proteins, and lipids. Some of the tests require a hot plate and glassware. What safety precautions should be observed in this situation? a. Wait at least 5 minutes after testing before touching hot glassware. b. Use maximum heat setting for testing all solutions. c. Use only heat-resistant glassware without cracks. d. Continue heating solutions until all solvent has evaporated. Water is classified as an inorganic compound because it a. does not contain carbon. b. does not contain nitrogen. c. contains hydrogen. d. contains oxygen.

9.

_______

10.

_______

Hemoglobin, insulin, albumin, and maltase which are composed of chains of amino acids, are examples of a. proteins b. carbohydrates c. lipids d. nucleic acids

11.

_______

The bond that joins two amino acids together is known as a. a double bond b. a hydrogen bond c. an ionic bond d. a peptide bond

12.

_______

The diagram below is a pictograph representing the estimated chemical composition of the human body. What percentage of the human body is composed of inorganic material? a. 25 % b. 32 % c. 68 % d. 74%

13.

_______

Biology is the study of: a. Animals b. Plants c. Life d. The earth and its systems

14.

_______

To which group of biomolecules do enzymes belong? a. Carbohydrates b. Proteins c. Nucleic Acids d. Lipids

15.

________

8 sugar molecules bonded together would be a a. monosaccharide b. disaccharide c. polysaccharide d. protein

16.

________

One characteristic of fats is: a. They attract water toward them. b. They are used to make new cells. c. They push water away from them. d. They store genetic information like DNA and RNA.

17.

________

Which of the following stores energy in cells: a. Proteins b. Lipids c. Nucleic Acids d. Nucleus

18.

________

In the human digestive system, the enzyme trypsin acts on proteins. The optimal temperature for the enzyme is approximately 40 C. Which of the following graphs shows how the activity of the enzyme most likely relates to the temperature of the reaction environment?

For questions 19-21, use the food labels below.

19.

________

What is the primary type of biomolecule in Food 1? a. Lipid b. Carbohydrate c. Protein d. Cholesterol

20.

________

What is the primary type of biomolecule in Food 2? a. Lipid b. Carbohydrate c. Protein d. Cholesterol

21.

You are told that one of the foods is a type of fruit and the other is a type of meat. a. Which food is the meat? _________________________ b. Which food is the fruit? _________________________

22.

________

Some bacteria contain a substance called nitrogenase. Nitrogenase catalyzes the chemical reaction that converts atmospheric nitrogen (N2) into ammonia (NH3). Nitrogenase is an example of which of the following? a. a sugar b. an enzyme c. a nucleotide d. an amino acid

23.

________

People with heart conditions are often required to limit their salt intake. According to these labels, which food should a person on a low-salt diet choose? a. Q b. R c. S d. T

24.

________

Which food has the highest percent daily value of lipids? a. Q b. R c. S d. T

25.

________

A student reads a label that states, “This sports drink will help you keep going through a tough workout, restoring essential vitamins and minerals to your body during exercise.” Based on this claim, the student is able to conclude that the sports drink contains a. carbohydrates b. vitamins B, C, and D c. some types of vitamins and minerals d. the recommended daily amount of vitamins and minerals...