In a certain bacterial gene, transcription fails to initiate properly. What is a possible explanation?
a) DNA has not properly unwound from histones.
b) The is a mutation in the inverted repeat sequence so that a hairpin can not form.
c) There is a mutation at the Pribnow box at the -10 upstream location.
d) There is a mutation at the Pribnow box at the -35 upstream location.
e) TATA-binding protein (TBP) has not been added yet.
Ans: c) There is a mutation at the Pribnow box at the -10 upstream location.
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An E. coli cell without a functional lacI gene is expected to _____
A) never produce ?-galactosidase B) always produce ?-galactosidase C) be unable to transport lactose into the cell D) be unable to metabolize lactose within the cell
Most of the earth's usable carbon is in its
a. sedimentary rocks. b. atmosphere. c. biomass. d. oceans. e. mantle
Newly hatched goslings follow any large moving
objects to which they are exposed shortly after hatching. This behavior is an example of a. homing. b. imprinting. c. piloting. d. migration. e. classical conditioning.
Choose the letter of the best match from the following:A. cognitionB. waggle danceC. navigationD. filial imprintingE. fixed action patternInnate motor program.
Fill in the blank(s) with the appropriate word(s).