Less than 1% More than 50% Approximately 50% Between 20% and 30% Approximately how much of the energy available in the tissues of the producer is eventually incorporated into the tissues of a secondary consumer? More than 50% Less than 1% Between 20% and 30% Approximately 50%

mutualistic commensalistic parasitic competitive An oakworm caterpillar feeds on the leaves of an oak tree. This type of interaction is — mutualistic commensalistic parasitic competitive

Fewer prey More parasites A reduction in competition Which of the following is most likely to cause increases in a predator population? A reduction in competition Fewer prey More parasites A period of drought

Hawks Mice Weasels Raccoons Which organisms in this food web can be described as both primary and secondary consumers? Hawks Mice Weasels Raccoons

Wolves and hawks are at the same trophic level because they — both eat primary consumers A both live on land are both large mammals have similar hunting patterns

Which body system is directly responsible for delivering nutrients to cells throughout the body? Integumentary system Circulatory system Endocrine system Respiratory system

Helper T cells Liver cells Red blood cells GABA-receptor cells Most viruses infect a specific kind of cell. Which of the following are infected by the human immunodeficiency virus (HIV)? Liver cells Helper T cells GABA-receptor cells Red blood cells

Viruses differ from bacteria in that all viruses — have rigid cell walls cause insect-borne diseases must be reproduced in living cells can be destroyed by antibiotics

Number of sugars Amount of adenine Sequence of nitrogen bases In DNA, which of the following determines the traits of an organism? Sequence of nitrogen bases Number of sugars Strength of hydrogen bonds Amount of adenine

African hunting dog (Lycaon pictus) Dogs (Canis familiaris) are most closely related genetically to which of the following organisms? Grizzly bear (Ursus arctos) African hunting dog (Lycaon pictus) Domestic cat (Felis catus) Gray wolf (Canis lupus)

Plantae Fungi Protista Animalia A laboratory investigation included examining prepared slides of pond water. Single-celled organisms with a nucleus and either cilia or flagella were visible. These organisms probably belong to the kingdom — Plantae Fungi Protista Animalia

Which structure regulates gas exchange during the processes of photosynthesis and respiration? Q

Thick stems Shallow roots Brightly colored flowers Broad leaf surfaces Which of the following characteristics could help short plants survive in areas with limited sunlight? Brightly colored flowers Broad leaf surfaces Thick stems Shallow roots

Citrulline Enzyme X Ornithine Enzyme Z This diagram shows the biochemical pathway that produces arginine in Neurospora, a mold. Neurospora is easily grown on a simple jelly-like medium. Different substances can be added to the medium. A mutant Neurospora lacking Enzyme Y would have to have which of these added to its medium in order to survive? Citrulline Enzyme X Ornithine Enzyme Z

In this food pyramid, which level contains the greatest amount of energy? Producers Primary consumers Secondary consumers Tertiary consumers