Combinatorial control refers to the fact that:
A. each gene has its own unique enhancers
found nowhere else on that chromosome.
B. each gene has a unique combination of
thousands of different enhancers.
C. each gene has a unique combination of
several different enhancers.
D. each gene has a unique combination of
several enhancers plus several dozen
regulatory transcription factors.
E. each gene has a unique combination of
several regulatory transcription factors, each
of which can combine with up to three dozen
transcriptional complexes.
C
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What organ or organs of a crocodile is/are
most like a mammal’s?
a. lungs b. kidneys c. heart d. eyes e. skin
Which of the following statements concerning euglenoids is FALSE?
a. They have a pellicle. b. They have 9 + 2 arrangement of microtubules in their flagella. c. Their cells contain mitochondria. d. They are unicellular. e. They are all photosynthetic.
Which of the following is not a basic theory of biology?
A. theory of gravity B. gene theory C. theory of evolution D. theory of ecosystems E. cell theory
Chloroplasts differ from mitochondria in that the former have
A) DNA. B) two lipid bilayers. C) 70S ribosomes. D) thylakoids. E) cristae.