Which of the following is true of transcription factors?
A) They regulate the synthesis of DNA in response to a signal.
B) They transcribe ATP into cAMP.
C) They initiate the epinephrine response in animal cells.
D) They control gene expression.
E) They regulate the synthesis of lipids in the cytoplasm.
Ans: D) They control gene expression.
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When a recipient cell acquires a piece of naked DNA from the environment, it is called
A. conjugation. B. transduction. C. transfection. D. transformation.
Solution "A" has a solute concentration of 10% while solution "B" has a solvent concentration of 80%. If they are separated by a selectively permeable membrane
A. the net direction of water movement will be from solution "A" to solution "B". B. the net direction of water movement will be from solution "B" to solution "A". C. there will be no net movement of water. D. the system is in dynamic equilibrium to begin with.
Which of the following statements concerning the causative agent of syphilis is TRUE?
A) It is a large helically coiled bacterium motile by means of endoflagella. B) It is an intracellular parasite. C) It is a non-motile comma-shaped bacterium. D) It is a large bacillus with peritrichous flagella. E) It is pleomorphic and motile by means of gliding motility.
Which of the following organelles contains enzymes that are able to manufacture H2O2?
A. chloroplasts B. peroxisomes C. ribosomes D. mitochondria