Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

1. DNA ... a. encodes the information needed for making proteins within the cell b. directs RNA to make lipids c. directs RNA to produce glucose d. produces carbohydrates 2. The physical structure of the genetic code is DNA's sequence of ... a.

9. Directions: Select each correct answer. More than one answer may be correct. Which of the following events can result in an offspring with unique heritable characteristics?

How can an operation prevent foodborne illness from molds and yeasts? a. freeze food with molds and yeasts overnight. b. throw out food containing mold and yeast. c. food handlers should wash their hands before cooking food with molds and yeasts. d.

In contrast to a disease, a disorder is generally defined as 1. any genetic mutation. 2. an untreatable condition. 3. an illness with specific symptoms. 4. any abnormality of body function.

Which of the following best describes all pioneer species? species that colonize new surfaces species that compete with other organisms species at the top of the food chain species that cooperate with other organisms

Which of the following is true regarding brain development and aging? a. Blood flow is increased in the brain. b. The brain uses more oxygen. c. The brain becomes smaller and lighter. d.

Which stage of the cell cycle involves cell growth and DNA replication? A) mitosis B) cytonesis C) interphase D) prophase

Approximately what percentage of a human's DNA is used for coding information for the synthesis of proteins?

Carbohydrates may form larger carbon-based macromolecules by combining with which elements? A.) sodium, potassium, nitrogenB.) nitrogen, sulfur, phosphorusC.) potassium, sodium, sulfurD.) silicon, phosphorus, sodium

What type of chemical reaction is used by liver cells when synthesizing glycogen from glucose?