Which of the following has a gametophyte that is an independent plant that dominates the life cycle and does NOT have a sporophyte that is an independent plant?
A) Pine B) Fern C) Moss D) Rose
C
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Diffusion is best defined as:
A. the random motion of individual molecules with net movement from areas of higher concentration to areas of lower concentration. B. the random motion of individual molecules with net movement from areas of lower concentration to areas of higher concentration. C. the highly ordered movement of large groups of molecules from areas of higher concentration to areas of lower concentration. D. the highly ordered movement of large groups of molecules from areas of lower concentration to areas of higher concentration. E. the transition from individual molecules moving in a random manner to groups of molecules moving in a highly ordered manner.
You suspect a region of DNA contains a promoter and wish to confirm that a sequence of interest binds proteins. Which experiment would you use?
A) in situ hybridization B) band shift assay C) pulse-chase assay D) Southern blotting E) northern blotting
The middle portion of a leaf that is sandwiched between the upper and lower epidermis is called the:
a.mesoderm. b. middle lamella. c. mesophyte. d. bundle sheath. e. mesophyll.
Which statement about resting potential is true?
A) A resting membrane allows much more sodium than potassium to diffuse across it. B) The concentration of sodium is much higher inside the cell than outside. C) The resting potential exists because of differences in glucose concentration inside and outside the cell. D) The sodium-potassium pump contributes to the resting membrane potential.