Describe two classes of proteins known to be involved in the regulation of the cell cycle
What will be an ideal response?
Protein kinases selectively phosphorylate target proteins. When complexed with cyclins, critical points of the cell cycle are controlled.
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In later chapters, you will learn more about the regulation of gene expression. One way to regulate gene expression is to make changes to the histone proteins to alter how tightly the DNA is coiled and wrapped. The more tightly coiled and wrapped a particular region of DNA is, the less likely it is that the genes in that region will be expressed. Bearing this in mind, how tightly do you think regions of heterochromatin are compacted?
A. Very tightly B. Moderately C. Loosely D. Not at all Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about gene expression? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is NOT an essential amino acid?
a. isoleucine b. threonine c. phenylalanine d. lysine e. glutamic acid
Which of the following would not be a component of normal urine?
a. water b. urea c. bile pigments d. salts e. glucose
Which type of effect has an increasing impact as the population size increases?
a. density-independent b. density-dependent c. mortality d. survivorship e. Coriolis