Regents Living Environment (LE) Examination August 2010 Question Answers (Prep-Review).
The University of the State of New York
REGENTS HIGH SCHOOL EXAMINATION
Wednesday, August 18, 2010 — 12:30 to 3:30 p.m.
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
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
3 Which statement concerning the reproductive cells in the diagram below is correct?
- (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.
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
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
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
7.) The diversity of organisms present on Earth is the result of
- (1) ecosystem stability
- (2) homeostasis
- (3) natural selection
- (4) direct harvesting
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?
- (1) cells and organs
- (2) cells and tissues
- (3) tissues and organelles
- (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
10.) The diagram below shows a process that affects chromosomes during meiosis.
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