The lumen of the digestive tract describes
a. the movement of food along its length.
b. its outer covering.
c. the space inside.
d. muscular layers.
e. the twisted path it follows through the abdomen.
C
You might also like to view...
To carry out a polymerase chain reaction (PCR), you must have DNA polymerase and
A. a DNA probe. B. the nucleotides to synthesize new DNA strands. C. a DNA synthesizer machine. D. a blueprint or gene map of the sequence you wish to copy.
What special features are evident in sperm cells but not in somatic cells, and how do these specializations function?
What will be an ideal response?
vitamin responsible for synthesis of hormones
What will be an ideal response?
How was disproving spontaneous generation associated with developing principles important to microbiology?
a. Pasteur's experiments with swan-necked flasks supported the concept that microbes in the air were responsible for contaminating nonliving matter. b. Proving spontaneous generation confirmed the existence of microbes. c. Spallanzani disproved spontaneous generation through his experiment, in which flasks of meat broth were boiled and then melted shut, preventing the passage of air altogether. d. Needham disproved spontaneous generation through his experiments, in which boiled flasks of broth, when covered, became cloudy, teeming with microorganisms after a few days.