The plant hormone ____ causes chloroplasts to mature
a. cytokinin
b. salicylic acid
c. abscisic acid
d. ethylene
e. gibberellin
ANSWER: a
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Which of the following is NOT true of hormones?
a. They are found in multicellular organisms. b. They are chemical messengers. c. They regulate development. d. They are a type of gene. e. They regulate growth.
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 A C. Protein Y D. Metal A E. Protein Z
Who was the first to visualize and study microbes using a simple lens microscope?
A. Hippocrates B. Robert Hooke C. Van Leeuwenhock D. Girolamo Fracastoro E. Robert Koch
A technique used in dating a rock can be used to accurately predict the age of the fossils occurring in the rocks. This technique involves
A. fossil dating. B. developmental geology. C. structural geology. D. radioactive isotope decay. E. successive rock layering.