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NYS Regents

NEW YORK STATE REGENTS EXAMS
LIVING ENVIRONMENT - JUNE 2003

16 Structures in a human female are represented in the diagram below.

A heavy dose of radiation would have the greatest impact on genetic
information in future off-spring if it reached gametes developing within structure

(1) A      (3) C
(2) B      (4) D

17 Organism X appeared on Earth much earlier than organism Y. Many  scientists believe organism X appeared between 3 and 4 billion years ago, and organism Y appeared approximately 1 billion years ago. Which row  in the chart below most likely describes organisms X and Y?

18 The sequence of diagrams below represents some events in a
reproductive process.

To regulate similar events in human reproduction, what adaptations are required?

(1) the presence of genes and chemicals in each cell in stages 1 to 7
(2) an increase in the number of genes in each cell in stages 3 to 5
(3) the removal of all enzymes from the cells in stage 7
(4) the elimination of mutations from cells after stage 5

19 Which statement best describes human insulin that is produced by genetically engineered bacteria?

(1) This insulin will not function normally in humans because it is produced by bacteria.
(2) This insulin is produced as a result of human insulin being inserted into bacteria cells.
(3) This insulin is produced as a result of exposing bacteria cells to radiation, which produces a mutation.
(4) This insulin may have fewer side effects than the insulin previously extracted from the pancreas of other animals.

20 Which population of organisms would be in greatest danger of becoming extinct?

(1) A population of organisms having few variations living in a stable environment.
(2) A population of organisms having few variations living in an unstable environment.
(3)A population of organisms having many variations living in a  stable environment.
(4)A population of organisms having many variations living in an unstable environment.
 

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