A feature unique to some archaeal plasma membranes is that they may ________.
A. consist of a lipid bilayer with embedded proteins
B. contain sterols such as cholesterol
C. consist of a lipid monolayer
D. consist of a lipid bilayer that lacks integral membrane proteins
Answer: C
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What typically stops the process of translation?
A. Rho proteins B. Aminoacyl tRNA synthase C. rRNA D. Stop codons E. Introns
Choose the proper item below for statements 54–57
a. operon b. operator c. promoter d. lactose M 54. This item contains regulator, promoter, and operator regions. D 55. A repressor protein can shut down transcription by binding to this item. M 56. This item codes for the production of a repressor. D 57. When the repressor is inactivated, RNA polymerase can bind to this item and allow transcription to occur.
What typically has to happen before a fruit develops? I) flowering II) pollination III) double fertilization
A) I only B) I and II C) II and III D) I, II, and III
Why is it necessary for the testes to be in the scrotum to function properly?
A) The scrotum keeps the testes at a cool temperature necessary for sperm production. B) The sperm are produced in the scrotal tissue and transferred to the testes to finish maturation. C) The scrotum contains alkaline fluids to nourish the sperm. D) The testes develop from scrotal tissues. E) The scrotum elevates the temperature of the testes, which increases sperm production.