Which of the following statements about villi is correct? (Select all correct choices.)
A. Villi can be found in both the jejunum and
the ileum.
B. Villi serve to increase surface area.
C. Villi allow for enhanced nutrient
absorption.
D. Villi move food particles through the
digestive tract.
E. Villi secrete multiple types of digestive
enzymes.
A,B,C
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What structure is indicated by the arrow in this image?
A. sporangia B. supporting stalk C. light sensitive hyphae D. mycelium E. rhizoids
Alloploidy provides a mechanism for slow speciation
________ Indicate whether the statement is true or false.
Which of the following techniques separates proteins based only on their size?
A) SDS-PAGE (SDS–polyacrylamide gel electrophoresis) B) mass spectrometry C) ion-exchange chromatography D) two-dimensional gel electrophoresis E) SDS-PAGE and mass spectrometry
Allergic reactions are triggered by the release of ________ from certain cells.
A. serotonin B. epinephrine C. acetylcholine D. histamine