Which molecules influence the rate of transcription?
a. RNA polymerase
b. regulatory proteins
c. exons
d. DNA
e. promoters
ANSWER: b
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The group mollusks includes:
A. gastropods and cephalopods. B. sponges and placozoans. C. crustaceans and bivalves. D. starfish and cephalopods.
The observation that ________ provides evidence that all living forms are related.
A) some organisms use mosaic determinism, whereas others use regulative determinism B) only histone genes are conserved C) many genes and genetic pathways are conserved D) sex determination occurs by different mechanisms in many species
When a zygote splits and both pieces embed in the
uterine wall they produce a. identical twins. b. fraternal twins. c. severe abdominal pain from a strong period. d. bladder control problems. e. all of these.
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A. anaerobic Bacillus species B. Clostridium species C. Rhizobium species D. Azotobacter species E. cyanobacteria