Question

practice staar questions

1. which pair of statements best compares the primary functions of the carbohydrate chitin and the protein keratin? hint: think about what the function of carbs and proteins are.

a. the chitin in the exoskeleton provides insulation for insectivorous bats
the chitin stores genetic information for insects
b. the chitin in the exoskeleton makes up the exoskeleton for insectivorous bats
the chitin provides insulation for insects
c. the chitin in the exoskeleton stores genetic material for insects
the chitin provides protection and protection for insectivorous bats
d. the chitin in the exoskeleton provides support for insects
the chitin breaks down chitin to be used by insectivorous bats

1. the function of an enzyme in a biochemical reaction is to

a. raise the temperature of the system
b. speed up the rate of the reaction added
c. increase the amount of substrate formed
d. change the type of product formed

1. which statement best compares a function of proteins and lipids in a human cell?

a. proteins provide energy for cellular processes. lipids catalyze chemical reactions inside the cell.
b. proteins allow for transport of certain molecules into and out of the cell. lipids store genetic information.
c. proteins catalyze chemical reactions inside the cell. lipids allow for the transport of certain molecules into and out of the cell.
d. proteins store genetic information. lipids provide energy for cellular processes.

1. which two components are most likely found in both viruses and prokaryotic cells?

a. nucleic acids and carbohydrates
b. carbohydrates and lipids
c. lipids and proteins
d. proteins and nucleic acids

1. 14. circle the part of the graph that shows the optimum condition (best) of enzyme activity.

enzyme activity vs. temperature
enzyme activity increasing
0 10 20 30 40 50 60 70
temperature (°c)

Explanation:

1. Chitin in the exoskeleton provides protection for insects. This is a well - known function of chitin.
2. The function of an enzyme in a biochemical reaction is to speed up the rate of the reaction. Enzymes are biological catalysts.
3. Proteins catalyze chemical reactions inside the cell and lipids allow for the transport of certain molecules into and out of the cell. These are basic functions of proteins and lipids.
4. Both viruses and prokaryotic cells contain proteins and nucleic acids. Proteins are involved in structure and function, and nucleic acids carry genetic information.
5. The peak of the graph represents the optimum condition of enzyme activity. This is where the enzyme activity is at its highest value.

Answer:

1. The chitin in the exoskeleton provides protection for insects.
2. b. Speed up the rate of the reaction
3. c. Proteins catalyze chemical reactions inside the cell. Lipids allow for the transport of certain molecules into and out of the cell.
4. d. Proteins and nucleic acids
5. The peak of the graph (around 40 - 50°C) should be circled.