Invertebrates on land use __________ or

__________ systems for gas exchange. Fill in the blank(s) with the appropriate word(s).


Answer: book lungs; tracheal

Biology & Microbiology

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In the process of molecular cloning, which of the following cuts DNA double strands so that they have sticky ends?

a. restriction enzyme b. recombinant protein c. plasmid d. codon

Biology & Microbiology

The first flowering plants, true mammals, and true frogs appeared during the _____ period.

A. Cambrian B. Jurassic C. Cretaceous D. Triassic E. Permian

Biology & Microbiology

Which of the following is not an example of exponential growth?

a. a savings account that earns 2.5% interest each year for 10 years b. the economy of a country that grows by 2% each year for 15 years c. a child who saves one dollar each week for 10 years d. bacteria that double their cell numbers every 30 minutes e. a J- shaped curve

Biology & Microbiology

If a population is in Hardy–Weinberg equilibrium and p 5 .6,

(a) q 5 .5. (b) q 5 .4. (c) q 5 .3. (d) q 5 .16.

Biology & Microbiology