What is the role of cleavage in the early embryo?
A. Extrude polar bodies
B. Create germ layers
C. Make the embryo larger
D. Produce bigger cells
E. Produce many cells
Answer: E
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Which of the following does not reflect the action of an effector molecule on the transcription of a gene?
A. An effector binds to a repressor to decrease the level of transcription. B. An effector binds to a repressor to increase the level of transcription. C. An effector binds to an activator to increase the level of transcription. D. An effector binds to a polymerase to increase the level of transcription.
The specimen of choice for detecting mycobacterium in a skin lesion or wound is a:
a. swab placed in Amie's transport medium or Stuart's medium. b. needle aspiration. c. skin scraping. d. swab placed in anaerobic conditions.
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms had evolved. Angiosperms make up 95% of all modern plants species. Which of the following may help explain the rapid success of angiosperms?
A. use of the wind to disperse pollen and seeds B. use of flowers and fruits to protect and disperse both pollen and seeds C. use of the wind to disperse spores D. use of water to disperse pollen and seeds E. All answers are correct.
What is the first level of control of eukaryotic gene transcription?
A) RNA splicing B) attachment of RNA polymerase to the promoter C) DNA packing and unpacking D) the binding and unbinding of transcription factors to enhancer sequences