If a gene is found in different groups, it is said to be
A. active.
B. variable.
C. conserved.
D. associational.
E. endogenous.
C. conserved.
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Biologists around the world spend a great deal of time studying the cytoskeleton of cells
Some of the tools they use in their research include chemicals that interfere with the structure of the cytoskeletal elements or with the activities of the motor proteins that associate with the cytoskeleton to facilitate movement. For example, a family of compounds called cytochalasins disrupts the normal assembly and disassembly of microfilaments. Another compound called colchicine binds to tubulin and prevents the assembly of microtubules. The function of dynein is prevented by a compound known as EHNA (erythro-9-[3-2- (hydroxynonyl)] adenine), and blebbistatin inhibits the activity of myosin. Use this information to answer the following questions. Based on this information, where would you predict blebbistatin to have the greatest effect? A. sperm cell motility B. leading edge formation of a migrating fibroblast C. the contraction at the trailing edge of a fibroblast D. Blebbistatin would likely have no effect on any of these examples of cell movement.
Although humans have had a negative impact on biodiversity in the past, the present global extinction rate is 20 times lower now than at any other time in the past
Indicate whether the statement is true or false
Researchers have been able to study the pathway of a secreted protein by "tagging" it with a fluorescent marker. Using this method, you would observe fluorescence moving from the ER to which organelle?
A) Plasma membrane B) Lysosome C) Nuclear membrane D) Mitochondria E) Golgi apparatus
Figure 22.18
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Refer to the above figure for questions.
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Which numbered item in the above figure represents a female gametophyte?
A. 1 B. 2 C. 3 D. 4 E. 5