The organelle that converts harmful hydrogen peroxide to water and oxygen is the ____
a. smooth ER
b. peroxisome
c. Golgi body
d. ribosome
e. lysosome
ANSWER: b
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Lysozyme
a. is secreted by endocrine glands in the skin. b. destroys the cell wall of invading bacteria. c. is produced in the lymph nodes and actively disables bacteria. d. is a very effective defense against viruses. e. is active within the circulatory system.
Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered the substrate of Kinase 1?
A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
Consider the following two statements: 1) Animal behavior can be required for the reproductive success of plants. 2) Animal behavior can be detrimental to the reproductive success of plants. Determine which one of the options below is correct
A. Statements 1 and 2 are both true. B. Statements 1 and 2 are both false. C. Statement 1 is true; statement 2 is false. D. Statement 1 is false; statement 2 is true.
Which of the photographs in the above figure
represents the gymnosperm? a. moss b. fern c. conifer d. monocot e. all of these