The exoskeleton of arthropods is composed of chitin
____________________ Indicate whether the statement is true or false.
T
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Cross-sectional surveys are very useful in establishing cause of a disease
Indicate whether this statement is true or false.
Is it possible to be a "carrier" (phenotypically normal but capable of passing the allele to one's offspring) for a genetic disease exhibiting this type of inheritance?
a. Yes b. No
Four of the following statements about crocodilians are true. Which statement is false?
a. They live in or near water. b. They are predators with sharp teeth. c. They have a two-chambered heart. d. They have powerful jaws. e. They are the closest living relatives to birds.
Which of the following are NOT structures by which viruses adhere to their host cells?
a. Capsule b. Spikes c. Fimbriae d. Slime layer