A rosebush needs to increase the concentration of phosphorus in the water within its xylem. Assuming that there is plenty of usable phosphorus dissolved in the water of the surrounding soil, how can the rosebush achieve this?
A. by transporting more phosphorus across
the root cortex
B. by transporting more phosphorus across
root hairs
C. by transporting more phosphorus across
the root endodermis
D. by transporting more phosphorus across
the epidermis of roots
C
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The coding sequence in the DNA of ________ is normally continuous; that is, it is not interrupted by noncoding sequences.
A. mammals B. most insects C. prokaryotes D. plants
How is lac operon transcription regulated by the presence or absence of lactose?
a. When lactose is available, the repressor will bind to allolactose instead of blocking RNA polymerase. b. When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from binding to the promoter. c. When lactose is not available, the repressor will bind to allolactose. d. When lactose is available, allolactose is produced and binds to the operator, blocking RNA polymerase. e. In the absence of lactose, transcription occurs at a low level resulting in the production of allolactose, which in turn stimulates the cell to take up lactose.
The protein that helps make vertebrate skin tougher and more waterproof is:
a. collagen b. elastin c. hemoglobin d. keratin e. melanin
In polygenic inheritance, such as height and skin color in humans, several genes each contribute to the overall phenotype in ______ degrees
Fill in the blank(s) with the appropriate word(s).