Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. (1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life. They are fantastically diverse, but three major groups may be identified on the basis of their motility. The Mastigophora have one or more long tails, which...
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Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.
(1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life. They are fantastically diverse, but three major groups may be identified on the basis of their motility. The Mastigophora have one or more long tails, which they use to project themselves forward. The Ciliata, which use the same basic means for locomotion as the Mastigophora, have a larger number of short tails. The Sarcodina, which include amoebae, float or row themselves about on their crusted bodies.
(2) In addition to their form of movement, several other features discriminate among the three groups of protozoans. For example, at least two nuclei per cell have been identified in the Ciliata, usually a large nucleus that regulates growth but decomposes during reproduction, and a smaller one that contains the genetic code necessary to generate the large nucleus.
(3) Protozoans are considered animals because, unlike pigmented plants to which some protozoans are otherwise almost identical, they do not live on simple organic compounds. Their cell demonstrates all of the major characteristics of the cells of higher animals.
(4) Many species of protozoans collect into colonies, physically connected to each other and responding uniformly to outside stimulate. Current research into this phenomenon, along with investigations carried out with advanced microscopes may necessitate a redefinition of what constitutes protozoans, even calling into question the basic premise that they have only one cell. Nevertheless, with the current data available, almost 40,000 species of protozoans have been identified. No doubt, as the technology improves our methods of observation, better models of classification will be proposed.
Which of the following statements are NOT true of protozoans?
(A) There are approximately 40,000 species.
(B) They are the most primitive forms of animal life.
(C) They have a large cell and a smaller cell.
(D) They are difficult to observe.
Fill in the following blanks according to what you hear:
Our primary method of research has been conducting short interviews with a large number of people.We decided that,unlike other almost every other study-based project we heard about,this one would make no categorical distinction between men and(1)..women.The two main groups,rather,would be adults and children,the idea for this obviously(2)coming...from the fact that 10-years-old cousin and I had(3)nearly...indentical experiences.It should come as no surprise that,since they were generally more(4). unwilling.than children to be interviewed by us.Surprisingly though,many of these adults were quiet willing to give us(5).permission..to interview their own children,who were generally much more(6). enthusiastic.about the chance to talk about their dreams.Because of their helpfulness,we've already had(7).264..children subjects alone,and well over 350 total repondents.
Our primary method of research has been conducting short interviews with a large number of people.We decided that,unlike other almost every other study-based project we heard about,this one would make no categorical distinction between men and(1) women ...The two main groups,rather,would be adults and children,the idea for this obviously(2).coming..from the fact that 10-years-old cousin and I had(3)nearly...indentical experiences.It should come as no surprise that,since they were generally more(4) unwilling ...than children to be interviewed by us.Surprisingly though,many of these adults were quiet willing to give us(5).. permission .to interview their own children,who were generally much more(6)..enthusiatic.about the chance to talk about their dreams.Because of their helpfulness,we've already had(7)..264 .children subjects alone,and well over 350 total repondents.
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