1 Which statement regarding the functioning of the cell membrane of all organisms is not correct?

(1) The cell membrane forms a boundary that separates the cellular contents from the outside environment.
(2) The cell membrane is capable of receiving and recognizing chemical signals.
(3) The cell membrane forms a barrier that keeps all substances that might harm the cell from entering the cell.
(4) The cell membrane controls the movement of molecules into and out of the cell.

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2 In multicellular organisms, cells must be able to communicate with each other. Structures that enable most cells to communicate with each other are known as

(1) pathogenic agents            (3) antibiotics
(2) chloroplasts                     (4) receptor molecules
 

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3 Every single-celled organism is able to survive because it carries out

(1) metabolic activities
(2) autotrophic nutrition
(3) heterotrophic nutrition
(4) sexual reproduction

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4 The shape of a protein molecule is influenced by

(1) whether it is organic or inorganic
(2) the sequence of amino acids in it
(3) the number of genes found in the nucleus
(4) the number of chromosomes in the cell

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5 The data table below summarizes the results of an investigation in which seeds from the same plant were grown under different conditions of temperature and relative humidity.


 

Which conclusion can be drawn from the information in the data table?

(1) Color in this species is determined by genes, only
(2) Many characteristics are not inherited.
(3) Mutations occur only when plants are grown at low temperatures.
(4) There is an interaction between environment and heredity.

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