Which sequence of stages in mitosis is correct?
A. prophase, anaphase, prometaphase, metaphase, telophase
B. prophase, telophase, anaphase, prometaphase, metaphase
C. prophase, prometaphase, metaphase, anaphase, telophase
D. telophase, anaphase, prophase, prometaphase, metaphase
E. anaphase, prometaphase, metaphase, prophase, telophase
Ans: C. prophase, prometaphase, metaphase, anaphase, telophase
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A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this
condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable. B. Yes, because there is one variable and a control C. No, because there is not more than one variable D. No because there is only one variable and a control
In horsetails, lycophytes, and whisk ferns, ____
a. spores give rise to gametophytes b. the main plant body is a gametophyte c. the sporophyte bears sperm- and egg-producing organs d. the gametophyte is the dominant stage in the life cycle e. the gametophyte produces spores
Activities that disrupt the production of melatonin at night may increase the risk of ____.
A. heart disease B. cancer C. increasing gonadal output D. pancreas reduction E. too much sleep
Before Darwin, scientists such as Lamarck envisioned evolutionary change as transformational—properties of an ensemble change because every member of the ensemble changes
Darwin's theory of evolutionary change was by contrast a variational one—the properties of an ensemble change because of the action of some sorting process acting on preexisting variation within the ensemble. Re-ferring to the figure above, describe the kind of sorting process that takes place when we use artificial selec-tion to change the characteristics of a breed of animals or plants and when natural selection operates on a population. What will be an ideal response?