The secondary level of protein structure is represented by the sequence of amino acids.
a. true
b. false
Answer: b. false
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Chloroplasts and mitochondria in eukaryotes are thought to have originated by ____ , where one organism lives within another
Fill in the blank with the appropriate word.
Which of the following is one reason that flatworms are flat?
a. They lack circulatory systems. b. They have small respiratory systems. c. They have only one germ layer. d. They lack any sex organs.
Populations that experience significant contest competition:a
show small changes in population size over time. b. show great changes in population size over time. c. are particularly susceptible to extinction. d. show little intraspecific competition. e. are characteristic of environments with abundant resources.
Which type of proteins are involved in nutrient transport across the plasma membrane and why?
A) integral proteins, because they span the membrane and are able to carry nutrients across the membrane B) integral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane C) peripheral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane D) receptor proteins, because their carbohydrate chains bind to nutrients and carry them across the membrane E) peripheral proteins, because they span the membrane and are able to carry nutrients across the membrane