Four of the five structures listed below participate in
a common function. Select the exception.
a. sensory neuron
b. medulla
c. interneuron
d. effector
e. receptor
Answer: b
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A nucleus is 4 ?m in diameter. Its DNA is composed of a million base pairs. Approximately how much does it need to be condensed in order to fit inside the nucleus?
A. 30-fold B. 100,000-fold C. 1 million-fold D. 3 million-fold
Which area of the United States experiences rainfall with the lowest pH?
a. southwest b. southeast c. northeast d. Midwest e. northwest
Cryptosporidium is an apicomplexian that can contaminate water supplies. Which of the following would you predict to be the case of a Cryptosporidium outbreak?
a. It can only be transmitted by insect bites because it is nonmotile b. It can grow in any water supply because it is photosynthetic c. It will be difficult to treat with chlorine because it forms spores d. It spreads rapidly because it has flagella e. It will enter a person's body through their respiratory tract
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