Julia spent $50 on a book. The cost of the book was $20 less than twice what she spent on a backpack. How much did the backpack cost?

During dna replication the wrong nucleotide was inserted in the DNA sequence. Which of the following terms describes the situation? Mutation, translation, regeneration, or transcription.

What is the function of the atmosphere's ozone layer?

Why is a particular sequence of bases in a segment of DNA important to cells? A. Some base sequences contain the order of sugars in polysaccharides. B. Some base sequences cause the release of lipids from the nucleus. C.

Which of these is an advantage of using natural gas? A. Equipment failure and human error can lead to oil spills. B. It releases chemicals that make acid rain. C. Scrubbers on smokestacks do not eliminate air pollution. D.

A man is exposed to large amounts of ultraviolet radiation while sunbathing at the beach. This exposure causes a genetic change in the DNA of a skin cell.

Which product is the result of light reactions in photosynthesis? A. Oxygen B. Water C. Glucose D. Carbon dioxide

What best explains the observation of an enzyme being selective in the reaction it catalyzes? a. Reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules. b.

What is an example of a farming practice that is good for the environment and preserves the rain forest

Which of the following is not an example of a trade-off? a. Flowers that produce more nectar are likely to receive more visits from pollinators. b.

As carbon dioxide enters systemic blood, it causes more oxygen to dissociate from hemoglobin (the Haldane effect), which in turn allows more CO2 to combine with hemoglobin and more bicarbonate ions to be generated (the Bohr effect). A. True B. False