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bio test 4
Terms in this set (12)
Which of the following best describes the role of cell-to-cell communication during a response to an invasion of antigens?
Chemicals that are secreted from antigen-presenting cells then activate helper T cells
Which of the following statements best describes a primary function of plasmodesmata?
They allow the movement of molecules from one cell to another, enabling communication between cells
Which of the following best explains a possible mechanism that would enable the hormone to efficiently reach all of the target cells in the body?
The hormone is released into the bloodstream where it can be transported to all cells with the correct receptors.
Which of the following best describes the component that metformin represents in a signal transduction pathway that regulates glucose production in the liver?
It is a ligand that activates the signal transduction pathway of the activation of AMPK.
Which of the following justifies the claim that differences in components of cell signaling pathways explain the different responses to epinephrine?
Cell signaling depends on the ability to detect a signal molecule. Not all cells have receptors for epinephrine. Only cells with such receptors are capable of responding.
Which of the following outcomes will most likely result from the inactivation of the beta-2 adrenergic receptor?
has a flow chart
The rate of glycogen synthesis in the cell will increase.
Which of the following best predicts what will happen to the blood glucose level if the person has another meal at 5 p.m.?
has a line graph
Immediately after the meal, the blood glucose level will increase, and then insulin will be secreted to counter the increase.
Based on the sample means, which of the following conclusions about the cells in the growing root tips of Zea mays seedlings is best supported by the results of the experiment?
More cells are produced per unit of time in the root tips growing in compact sand than in the root tips growing in loose sand.
Based on Figure 1, which of the following statements correctly links a stage of the cell cycle with the event occurring at that stage?
Synthesis of sufficient DNADNA for two daughter cells occurs in stage II.
Which of the following statements is consistent with the data in Figure 1?
number flow chart
There is a change from 3 to 6 picograms of DNADNA because DNADNA is replicated before each round of cell division.
Which of the following most accurately describes an observation and an effect of the viral infection indicated by the data in Table 1?
infected cells table
Seventy-five percent of the virus-infected cells are found in mitosis. The virus stimulates frequent cell division.
Based on the data, the percent of the mitotic cells that were in metaphase is closest to which of the following?
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