Regents Living Environment (LE) August 2010 Questions Answers

Regents Living Environment (LE) Examination August 2010 Question Answers (Prep-Review).

The University of the State of New York
REGENTS HIGH SCHOOL EXAMINATION
LIVING ENVIRONMENT
Wednesday, August 18, 2010 — 12:30 to 3:30 p.m.

Part A

Directions (1–30): For each statement or question, write on your separate answer sheet the number of the word or expression that, of those given, best completes the statement or answers the question.

1 An ecosystem that has almost the same number and type of organisms for many years is exhibiting

  • (1) feedback
  • (2) global instability
  • (3) environmental change
  • (4) equilibrium
Answer: (4) equilibrium 

2 Which system is correctly paired with its function?

  • (1) immune system—intake and distribution of oxygen to cells of the body
  • (2) excretory system—remove potentially dangerous materials from the body
  • (3) digestive system—transport energy-rich molecules to cells
  • (4) circulatory system—produce building blocks of complex compounds
Answer: (2) excretory system—remove potentially dangerous materials from the body

3 Which statement concerning the reproductive cells in the diagram below is correct?

Regents Living Environment (LE) August 2010 Questions
  • (1) The cells are produced by mitosis and contain all the genetic information of the father.
  • (2) If one of these cells fertilizes an egg, the offspring will be identical to the father.
  • (3) Each of these cells contains only half the genetic information necessary for the formation of an offspring.
  • (4) An egg fertilized by one of these cells will develop into a female with the same characteristics as the mother.
Answer: (3) Each of these cells contains only half the genetic information necessary for the formation of an offspring.

4 Which set of functions is directly controlled by the cell membrane?

  • (1) protein synthesis, respiration, digestion of food molecules
  • (2) active transport, recognition of chemical messages, protection
  • (3) enzyme production, elimination of large molecules, duplication of DNA codes
  • (4) the release of ATP molecules, regulation of cell reproduction, food production
Answer: (2) active transport, recognition of chemical messages, protection

5 When a new viral infection appears in a population, scientists usually try to develop a vaccine against the virus. Which substances would most likely be contained in the new vaccine?

  • (1) live bacteria that ingest viruses
  • (2) white blood cells from an infected individual
  • (3) weakened viruses associated with the infection
  • (4) a variety of microbes that will attack the virus
Answer: (3) weakened viruses associated with the infection

6.) The human heart and lungs contain cells that

  • (1) produce a hormone involved in respiration
  • (2) have the same genetic information but perform different specialized functions
  • (3) use one part of the genetic code to synthesize all enzymes needed by the cell
  • (4) contain different numbers of DNA molecules
Answer: (2) have the same genetic information but perform different specialized functions

7.) The diversity of organisms present on Earth is the result of

  • (1) ecosystem stability
  • (2) homeostasis
  • (3) natural selection
  • (4) direct harvesting
Answer: (3) natural selection

8.) Some stages in the development of an organism are represented in the diagram below.
Which levels of biological organization do stages 2 and 7 have in common?

Regents Living Environment (LE) August 2010 Questions 8
  • (1) cells and organs
  • (2) cells and tissues
  • (3) tissues and organelles
  • (4) organelles and cells
Answer: (4) organelles and cells

9.) Plants in species A cannot fight most fungal infections. Plants in species B make a protein that kills many fungi. One possible way for humans to produce species A plants with the ability to synthesize this protein would be

  • (1) mutate fungal DNA and introduce the mutated DNA into species B using a virus
  • (2) add DNA from species B into the soil around species A
  • (3) insert the gene for the protein from species B into a chromosome in species A
  • (4) cross-species A and a fungus to stimulate the synthesis of this protein
Answer: (3) insert the gene for the protein from species B into a chromosome in species A

10.) The diagram below shows a process that affects chromosomes during meiosis.

Regents Living Environment (LE) August 2010 Questions 10

This process can be used to explain

  • (1) why some offspring are genetically identical to their parents
  • (2) the process of differentiation in offspring
  • (3) why some offspring physically resemble their parents
  • (4) the origin of new combinations of traits in offspring
Answer: (4) the origin of new combinations of traits in offspring

 

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