Which of the following is considered to be the most basic living unit?
a. molecule
b. organelle
c. organ system
d. tissue
e. cell
E
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When does the ? subunit dissociate from RNA polymerase?
A. after promoter clearance B. at the termination of transcription C. immediately after promoter binding D. immediately before promoter binding E. not until the enzyme is degraded
How does the hypothalamus of the sexually mature human male regulate reproductive hormone levels?
a. The hypothalamus continuously secretes large amounts of GnRH. b. The hypothalamus responds to low levels of testosterone by synthesizing and releasing testosterone. c. The hypothalamus secretes GnRH in brief pulses every two to three hours. d. The hypothalamus secretes LH in response to high levels of testosterone. e. The hypothalamus responds to low levels of GnRH by synthesizing and releasing testosterone.
The difference in lipid and protein composition between the membranes of the endomembrane system is largely determined by the _____
A) transportation of membrane lipids among the membranes of the endomembrane system by small membrane vesicles B) function of the Golgi apparatus in sorting and directing membrane components C) modification of the membrane components once they reach their final destination D) synthesis of different lipids and proteins in each of the organelles of the endomembrane system
The nucleocapsid consists of
A) The envelope and capsid B) The nucleic acid along with the capsid C) The capsomers assembled into the capsid D) The envelope, nucleic acid, and capsid E) The nucleic acid of the virus only