The islets of Langerhans are in the ________ and produce ________.
A. stomach; hydrochloric acid
B. liver; bile
C. stomach; intrinsic factor
D. pancreas; insulin
E. mouth; saliva
Answer: D
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The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria
__________ Indicate whether the statement is true or false.
Which of the following statements about the insect exoskeleton is NOT true?
A. The insect exoskeleton grows with the organism. B. The insect exoskeleton has muscles attached to it from the inside of the body. C. The insect exoskeleton is made of a complex form of carbohydrate called chitin. D. The exoskeleton protects insects against predators and drying out. E. The insect exoskeleton is jointed and movable.
Genes contain instructions for assembling
a. proteins b. nucleosomes c. operons d. mutagens
Once you have had a primary exposure to a specific antigen and encounter this antigen again, you will mount a rapid immune response due to:
A) memory cells. B) antigen-presenting cells. C) cytotoxic T cells. D) antibodies.