June 2019 Living Environment Regents Questions 31-40 Question Preview (ID: 56857)

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A scientist analyzed a segment of DNA from a human chromosome and found that the percentage of thymine molecular bases (T) was 35%. Which row in the chart below contains the correct percentages of the other molecular bases in the DNA segment?

a) 1

b) 2

c) 3

d) 4

Which statement about the hares and lynx can be supported with information from the graph?

a) The hare is the predator of the lynx because it is a larger animal.

b) The lynx population begins to drop after the hare population drops.

c) Both populations go through cycles due to the succession of plant species.

d) Both populations have a carrying capacity of 3000 per square kilometer.

Which statement concerning the structures within this cell is accurate?

a) Structure 1 is a chloroplast that carries out photosynthesis.

b) Structure 2 is a vacuole that contains DNA.

c) Structure 3 is a mitochondrion, where respiration takes place.

d) Structure 4 is the cell membrane, which provides rigid support for the cell.

Which process performed by organisms produces oxygen for the aquatic ecosystem?

a) respiration

b) replication

c) active transport

d) autotrophic nutrition

Examples of autotrophs in this food web are

a) killer whales and grasses

b) sedges and bulrushes

c) mosquitoes and grasshoppers

d) snails and seals

In addition to grasshoppers, herring may also get energy from

a) algae

b) bald eagles

c) snails

d) voles

Each species listed is a predator. If the prey organisms that each predator consumes were tested, they would most likely contain

a) the same amount of mercury as the predator species

b) less mercury than the predator species

c) more mercury than the predator species

d) no mercury, since the predators probably get it from the polluted water

Which statement is best supported by the data in the chart?

a) Any fish caught in the Gulf of Mexico would have low levels of mercury.

b) Eating catfish or haddock would be most likely to cause deadly mercury poisoning.

c) Spiny lobsters may have more or less mercury than indicated because only a few were sampled.

d) Tilefish are the most nutritious of all the species listed.

The substance represented by the scissors shown cutting the DNA is

a) an enzyme

b) a starch molecule

c) a carbohydrate

d) a fat molecule

The human body has many cells that are deep inside the body. For this reason, the human body requires

a) a transport system and other organs

b) carbon dioxide from the air

c) the synthesis of many inorganic compounds

d) the breakdown of glucose by the digestive system

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