Which region(s) of the brain, present in a 5-week old embryo, is/are derived from the forebrain?
a. telencephalon only
b. diencephalon only
c. mesencephalon only
d. telencephalon and diencephalon
e. telencephalon and mesencephalon
ANSWER: d
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a. sinks; less b. rises; less c. sinks; more d. rises; more
Of all organisms, prokaryotes are the ____
a. smallest b. least abundant c. least metabolically diverse d. least widespread e. least evolved
Which of the following is false regarding the
properties of sound? a. The amplitude of a sound corresponds to loudness. b. The frequency of a sound is the number of wave cycles per second. c. Every ten-decibel increase in loudness represents a tenfold increase in intensity. d. A soft sound has a greater amplitude than a loud sound. e. A high note and a low note with the same amplitude are equally loud.
Who first confirmed that the replication of DNA was semiconservative?
a. Chargaff and Hershey b. Watson and Crick c. Avery and Griffith d. Meselson and Stahl e. Watson, Crick, and Wilkins