_ are an essential nutrient for animals.
Options:
- (A) Energy
- (B) Chemicals
- (C) trees
- (D) potatoes
- (E) Acids
- (F) allow growth
- (G) store
- (H) Proteins
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Let's think first: All animals are heterotrophs. Proteins are an essential nutrient for heterotrophs . Proteins are an essential nutrient for animals.... So the answer is [(H)]

Secondary vascular tissues are employed by bamboo and what other kind of tree?
Options:
- (A) plants
- (B) ferns
- (C) grass
- (D) coniferous
- (E) Trees
- (F) elms
- (G) palm
- (H) deciduous
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Let's think first: Secondary growth forms secondary vascular tissues and bark. Some, such as bamboo and palm trees, have secondary growth. Secondary vascular tissues are employed by bamboo and palm trees.... So the answer is [(G)]

Oncogenes promote the division of cells using the damaged form of what?
Options:
- (A) deoxyribonucleic acid
- (B) oncogenes
- (C) proteins
- (D) Chemical energy
- (E) epidermis and dermis
- (F) the body's largest organ
- (G) Veins and arteries.
- (H) healthy cells
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Let's think first: Oncogenes promote the division of cells with damaged DNA. DNA DNA is deoxyribonucleic acid. Oncogenes promote the division of cells with damaged deoxyribonucleic acid.... So the answer is [(A)]

What are molecules that the immune system recognizes as foreign to the physical entity?
Options:
- (A) bacteria
- (B) proteins
- (C) antibodies
- (D) Allergies
- (E) negative
- (F) immunities
- (G) parasites
- (H) antigens
--
Let's think first: Antigens are molecules that the immune system recognizes as foreign to the body. Bodies are physical entities. Antigens are molecules that the immune system recognizes as foreign to the physical entity.... So the answer is [(H)]

What is usually chosen in evolution?
Options:
- (A) common traits
- (B) Plant reproduction
- (C) advantageous systems
- (D) undesirable traits
- (E) Animal survival
- (F) competition
- (G) mysterious sytems
- (H) Earth revolving around the sun
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Let's think first: Evolution occurs by a process called natural selection. Natural selection only selects functionally advantageous systems. In evolution only functionally advantageous systems are selected.... So the answer is [(C)]

Molecules of _ bring the building blocks of protein to the ribosomes in the correct sequence.
Options:
- (A) form
- (B) fusion
- (C) core
- (D) shape
- (E) sugar
- (F) HIV
- (G) tRNA
- (H) small
--
Let's think first: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. Amino Acids Amino acids are the building blocks of proteins. Molecules of tRNA bring the building blocks of proteins to the ribosome in the correct sequence.... So the answer is [(G)]