The evolution of many closely related species from one or a few ancestral species in a relatively short
period of time is referred to as:
a. allometric growth.
b. preadaptations.
c. adaptive radiation.
d. microevolution.
e. allopatric speciation.
C
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You collect and measure samples of ice and surrounding ice water from a stream in the winter. You find that you collected the same number of water molecules in each form. The volume of the ice samples are larger than the ice water samples. This is a result of
A. the ionic bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. B. the covalent bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. C. the covalent bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice. D. the hydrogen bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. E. the hydrogen bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice.
The most common outcome of the process in the accompanying figure is no viable gametes. This happens because of:
a. hybrid inviability.
b. defective meiosis.
c. gametic isolation.
d. species incompatibility.
e. a low rate of fertilization.
Which of the following are functions of rhizobacteria?
I) produce hormones that stimulate plant growth II) produce antibiotics that protect roots from disease III) absorb toxic metals IV) carry out nitrogen fixation A) only II and IV B) only I, II, and III C) only III and IV D) I, II, III, and IV
A scientist develops a new medication that is a protein compound and that must be administered by injection. Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?
A. autoclaving B. filtration C. dilution with alcohol D. lyophilization E. ultraviolet irradiation