The giant tube worms (Riftia) found at hydrothermal vents form a symbiotic
relationship with
a. fungi.
b. sulfur-oxidizing bacteria.
c. cyanobacteria.
d. nitrogen-fixing bacteria.
Answer: B
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As a pond starts to dry out at the end of the rainy spring season, a researcher notices that toads
burrow into the soil where they can hibernate for up to nine months. What is the benefit of hibernation?
a. reduced metabolic rate that ensures survival b. increased body temperature that ensures survival c. a period of time during which the animal completes sexual maturity d. all of these
DNA strands can be clipped crosswise at selected positions by using enzymes called ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
What are responsible for the rapid mobilization of
the immune response after a subsequent attack by a pathogen? a. naive B cells b. naive T cells c. NK cells d. memory cells e. macrophages
Which is the main organic molecule that is digested by the secretions of the stomach?
A) carbohydrate B) protein C) lipid D) nucleic acid