Which of the following are functions of the large intestine?
A) elimination of feces
B) absorption of water
C) digestion of food by digestive enzymes
D) absorption of some vitamins
Ans:
A) elimination of feces
B) absorption of water
D) absorption of some vitamins
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Insertions and deletions of single nucleotides:
A. cause nonsense mutations. B. cause frameshift mutations. C. add or delete amino acids to/from the normal polypeptide. D. shorten chromosomes. E. cause cancer.
How does gene flow affect the genetic composition in populations?
A. Gene flow promotes genetic diversity by introducing new alleles into populations. B. Gene flow tends to make the allele frequencies in neighboring populations more similar to each other. C. Gene flow promotes genetic diversity by introducing new alleles into populations and gene flow tends to make the allele frequencies in neighboring populations more similar to each other. D. Gene flow promotes genetic similarities by removing alleles from a population.
When a small amount of hydrochloric acid (HCl) is added to a solution of Na2HPO4, the pH of the solution does not
change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to this same solution. Based on these observations, the compound Na2HPO4 is: a. acting as a buffer. b. acting as a solvent. c. able to donate hydrogen atoms to HCl. d. able to remove hydrogen ions from the OH? of NaOH. e. an enzyme facilitating the reaction between HCl and NaOH.
Select the best response to the question. A patient who contracts a strain of the flu has ?immunity in the future against that same strain of the flu. This is an example of which type of immunity?
A) natural active immunity B) artificial passive immunity C) the patient does not develop any immunity D) artificial active immunity