Q: Answer the following question given this paragraph: Individual nucleotides can be linked together through their phosphate groups to form nucleic acid polymers. Once constructed, DNA generally exists as two strands that are linked together by hydrogen bonds, producing a double-helical structure (see Figure below ). Q: Individual nucleotides can be linked together through their phosphate groups to form? A:

OPTIONS:
- atoms
- nitrous acid polymers
- dna
- nucleic acid polymers

A: nucleic acid polymers

input: OPTIONS:
- acids
- neutrons
- resistors
- nucleophiles Now, answer this question: Answer the following question given this paragraph: Electrophiles have a strong tendency to react with nucleophiles. CONCEPTUAL PROBLEMS. Q: Electrophiles have a strong tendency to react with what? A:
A:
output: nucleophiles

Answer the following question given this paragraph: Abiotic features of rivers and streams vary along the length of the river or stream. Streams begin at a point of origin referred to as source water. The source water is usually cold, low in nutrients, and clear. The channel (the width of the river or stream) is narrower here than at any other place along the length of the river or stream. Headwater streams are of necessity at a higher elevation than the mouth of the river and often originate in regions with steep grades leading to higher flow rates than lower elevation stretches of the river. Faster-moving water and the short distance from its origin results in minimal silt levels in headwater streams; therefore, the water is clear. Photosynthesis here is mostly attributed to algae that are growing on rocks; the swift current inhibits the growth of phytoplankton. Photosynthesis may be further reduced by tree cover reaching over the narrow stream. This shading also keeps temperatures lower. An additional input of energy can come from leaves or other organic material that falls into a river or stream from the trees and other plants that border the water. When the leaves decompose, the organic material and nutrients in the leaves are returned to the water. The leaves also support a food chain of invertebrates that eat them and are in turn eaten by predatory invertebrates and fish. Plants and animals have adapted to this fast-moving water. For instance, leeches (phylum Annelida) have elongated bodies and suckers on both ends. These suckers attach to the substrate, keeping the leech anchored in place. In temperate regions, freshwater trout species (phylum Chordata) may be an important predator in these fast-moving and colder river and streams. Q: In headwater streams, what plant process is mostly attributed to algae that are growing on rocks? A:

OPTIONS:
- mitosis
- symbiosis
- reproduction
- photosynthesis

Answer: photosynthesis

Problem: OPTIONS:
- no effect
- silences it
- reduces it
- increases it
Q: Answer the following question given this paragraph: Adding a solute increases the boiling point of a pure solvent. This change can be calculated using the equation . Q: Adding a solute does what to the boiling point of a pure solvent? A:
Answer: increases it

Problem:OPTIONS:
- bacteria
- reptiles
- insects
- humans

Answer the following question given this paragraph: Q: What organism is the most disruptive towards the diversity of other species? A:
****
A: humans

Problem:OPTIONS:
- the Moon
- seasons
- equator
- the sun

Answer the following question given this paragraph: Earth is warmed by energy that radiates from the sun. Earth radiates some of the energy back into space. Greenhouse gases (GHGs) trap much of the re-radiated energy, causing an increase in the temperature of the atmosphere close to the surface. Q: What is the major source of warmth for earth? A:
****
A:
the sun