The _____ drains the upper part of the body
a. right lymphatic duct
b. spleen
c. tonsils
d. thoracic duct
e. lymphocyte duct
ANSWER: a
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What might happen if the insulator between two genes is missing?
A. Without the insulator, neither gene can be transcribed. B. Transcription factors influencing one gene's expression may abnormally influence a neighboring gene's expression C. Transcription factors will not be able to influence the expression of either gene. D. Without insulation, both genes will be expressed at maximal levels. E. Transcription factors will not be able to bind to the insulator.
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
Place the cellular processes responsible for animal development in the correct order: ____
a. induction ? differentiation ? determination b. induction ? determination ? differentiation c. determination ? induction ? differentiation d. determination ? differentiation ? induction e. differentiation ? determination ? induction
During prophase II, ____.
A. a new spindle forms B. crossing over occurs C. chromosomes are single-stranded D. the cell is diploid E. the nuclear envelope re-forms