Linnaeus sorted animals into groups based on body plans. Today, these groupings are called:
A. families.
B. branches on the phylogenetic tree.
C. phyla.
C
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Describe the pathway of information in a neuron.
What will be an ideal response?
You conduct an experiment in which you add increasing amounts of substrate to an enzyme solution and then measure
the resulting reaction rate. You plot the rate of the reaction on the Y-axis versus substrate concentration on the X-axis. What do you conclude from your graph? a. The reaction rate is independent of substrate concentration. b. The reaction rate decreases with increasing substrate concentration. c. The reaction rate is directly proportional to substrate concentration. d. The reaction rate increases but then decreases, forming a bell-shaped curve. e. The reaction rate increases with increasing substrate concentration up to a point, above which the rate remains constant.
Using powerful new sequencing technologies, investigators can now catalog every RNA molecule made by a cell and determine at what quantities these RNAs are present. In an experiment, researchers measured the relative quantities of two different mRNAs—one transcribed from gene A, the other from gene B—in two different cell types. Gene B is expressed in both the liver and the brain whereas gene A is expressed in the brain but not in the liver. Which most likely encodes a housekeeping protein?
A. gene B only B. gene A only C. both genes D. neither gene
In an aquatic ecosystem, a secondary carnivore is temporarily excluded and then, after a period of time, is returned. Which one of the following is not an expected top-down effect after it is returned?
A. Primary productivity increases. B. Algae decrease. C. Herbivores become more abundant. D. Primary carnivores become less abundant.