What is the order of anatomical structures through which a sperm cell passes during maturation and expulsion from
the body?
1. vas deferens
2. epididymus
3. urethra
a. 1-2-3
b. 1-3-2
c. 2-3-1
d. 2-1-3
e. 3-1-2
ANSWER: d
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. A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid influences the movement of potassium ions out of the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
The classic "Miller experiments," performed in the 1950s by Harold Urey and Stanley Miller, were the first to show that:
A. the average bill size of a population of Darwin's finches changed with environmental conditions, proving that microevolution can occur within a human lifetime. B) simple organic molecules, such as amino acids, could form spontaneously in the laboratory under chemical conditions mimicking those of primitive earth. C. natural selection could occur in a petri dish within a population of bacteria known to have differential abilities to digest complex sugars. D. water (H2O) could be separated into atmospheric oxygen and H2 gas.
In studying fossils, biologists found an insect in a layer of clay, a flower in a layer of sand, a fish in a layer of mud, a reptile in a layer of clay, and a bird in a layer of rock. The insect probably lived at the same time as the
A. fish. B. bird. C. flower. D. reptile.
Cyanobacteria produce a cell type known as a (cyst/heterocyst/nodule) that protects nitrogenase from the exposure to oxygen.
Fill in the blank(s) with the appropriate word(s).