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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
		Animal Length of digestive system Diet category Animal weight Koala 305 cm herbivore 10 kg Dog 135 cm carnivore 11 kg Rabbit 272 cm herbivore 9 kg Bobcat 145 cm carnivore 12 kg
A B C D	1.	What is the average weight of the animals in the table? a. 9.5 kg c. 22 kg b. 10.5 kg d. 42 kg
A B C D	2.	What part of the nucleus is labeled C? a. Chromatin c. Nucleolus b. Nuclear envelope d. Cytoplasm
A B C D	3.	Which labeled part is made up of strands of DNA? a. A c. C b. B d. D
A B C D	4.	If the problem you wanted to solve involved determining the composition of a specific star, which of the following would you least likely use to gather information about the problem? a. encyclopedias c. textbooks b. newspapers d. the Internet
A B C D	5.	You are performing an experiment to determine the relative solubilities of alcohol, oil, salt, and sugar in water. Which of the following pieces of equipment would be unsafe to use during this experiment? a. laboratory burner c. stirring rod b. beaker d. balance
A B C D	6.	Which of the following best describes the role of RNA molecules that form in the nucleus when DNA is copied? a. RNA molecules are messengers that carry the code from the DNA to the ribosomes. b. RNA molecules are responsible for the genetic code. c. RNA molecules attach to ribosomes. d. RNA molecules determine how an organism looks and acts.
A B C D	7.	Which of the following pairs of terms are NOT closely related? a. RNA-DNA c. carbon-codons b. proteins-amino acids d. genes-chromosomes
A B C D	8.	Which of these processes does NOT require DNA replication? a. mitosis c. cell division b. meiosis d. cell growth
A B C D	9.	Why can the deletion of a single nitrogen base in DNA be harmful to an organism? a. Deletion causes chromosomes to join backwards or to join to the wrong chromosomes. b. Nearly every amino acid in the protein will change after the deletion of the base. c. Deletion causes a gamete to have an extra chromosome. d. Such a mutation causes one chromosome to break off and join to another chromosome.
A B C D	10.	Why does a person with only one copy of a defective gene often not get the disorder associated with the gene? a. Neither parent was a carrier of the gene. b. Both parents were carriers. c. This individual is protected by the presence of a normal gene. d. The individual is not able to reproduce.
A B C D	11.	The place where two bones meet is called a joint. To which body system do joints belong? a. Circulatory system c. Muscular system b. Digestive system d. Skeletal system
A B C D	12.	Insects produce dry wastes. Which of the following is a possible reason for this? a. Insects have poorly developed excretory systems. b. Insects have no urinary systems. c. Producing dry wastes conserves water. d. Insects must produce dry wastes in order to molt.
A B C D	13.	What data will a student need to collect to determine the speed of a toy car? a. distance only c. mass, distance, time b. distance, time d. speed only
A B C D	14.	Which of the following is the larger classification of organisms? a. Species c. Family b. Genus d. Order
A B C D	15.	A student is viewing some cells under a microscope. How might she determine whether they are plant or animal cells? a. Animal cells are larger than plant cells. c. Only plant cells have cell walls. b. Only animal cells have nuclei. d. Only animal cells have chromosomes.
A B C D	16.	Which of the following correctly sequences organisms from simplest to most complex? a. Eubacteria, plant, protist c. Fungi, animal, archaebacteria b. Eubacteria, protist, animal d. Plant, fungi, protist
A B C D	17.	What three body systems are involved in this reaction? a. Integumentary, nervous, and muscular c. Integumentary, skeletal, and muscular b. Skeletal, nervous, and circulatory d. Integumentary, autonomic, and muscular
A B C D	18.	The response shown is a reflex response. Which of the following is NOT involved in this response? a. Skin c. Brain b. Spinal cord d. Arm muscles
A B C D	19.	Periods of drought (absence of rain) break up a forest into smaller patches of trees. Natural selection results in tree frog populations evolving distinct gene pools. Groups of frogs can no longer produce fertile offspring. Which of the following processes occurred in this situation? a. Extinction c. Phylogenetic classification b. Convergent evolution d. Geographic isolation
A B C D	20.	According to the diagram, what is the common ancestor of the modern elephant? a. Loxodonta africana c. Elephas maximus b. Mammuthus primigenius d. Primelephas
A B C D	21.	The trees that produce the large McIntosh apples are treated with a chemical so that the apples have twice the number of chromosomes in their cells. What type of speciation is this? a. Reproductive isolation c. Punctuated equilibrium b. Polyploid speciation d. Gradualism
		Fungi are consumers that obtain their food from plant roots. Thus, they live in close association with certain plants. As they grow, fungi form large, underground, threadlike nets. These nets allow the plants to extend their root systems. The larger root systems, in turn, help the plants obtain more nutrients from the soil.
A B C D	22.	What type of relationship do fungi have with the plants? a. Predation c. Commensalism b. Parasitism d. Mutualism
A B C D	23.	What adaptation allows a redwood tree to grow to towering heights? a. Vascular tissues c. Rhizoids b. Broad leaves d. Cuticles
A B C D	24.	How is energy replenished in ecosystems? a. By the Sun c. By recycling b. By body functions d. By food chains
A B C D	25.	What happens during the process of condensation? a. A solid changes into a gas. b. Rain, sleet, or snow fall to Earth’s surface. c. A liquid changes into a gas. d. A gas changes into a liquid.