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Skip to main content. You are here Home. Wait just a minute here Get started right now! A Recontouring makes the vegetation in the area grow out of control B Recontouring allows the water properties of the system to return to normal faster C Abandonment is the better treatment for restoration D Their original prediction that recontouring would produce greater plant diversity was supported Answer: B Topic: 1. A Insect numbers over time B Pesticide use over time C Species of insects resistant to pesticides over time D Number of insect offspring showing resistance to pesticides over time Answer: C Topic: 1.
A Insects became more prevalent during the s B Insects that were killed by pesticides did not have offspring, but those who were resistant did C Pesticide use promoted genetic changes that caused new species to arise D Insects needed to survive pesticides, so they gained new mutations for resistance Answer: B Topic: 1. These questions focus on elements most important to life or the study of life, including the elements that comprise organic molecules and important trace elements.
Some isotopes are important in geologic dating and in biological tracer studies. How elements participate in forming different types of chemical bonds is essential to mastering subsequent topics on the behavior and properties of biological molecules, structures, and energy metabolism. Multiple-Choice Questions 1 About 25 of the 92 natural elements are known to be essential to life. A carbon, sodium, hydrogen, nitrogen B carbon, oxygen, phosphorus, hydrogen C oxygen, hydrogen, calcium, nitrogen D carbon, hydrogen, nitrogen, oxygen E carbon, oxygen, nitrogen, calcium Answer: D Topic: Concept 2.
Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants? A Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements of living matter. B Some trace elements are very abundant on Earth. C Virtually all organisms require the same elements in the same quantities.
D Iron is an example of an element needed by all organisms. E Other than some trace elements, animals are mostly made up of the same elements as plants, in similar proportions.
Answer: C Topic: Concept 2. A Each element has a unique atomic mass. B Each element has a unique atomic weight. C Each element has a unique number of protons in its nucleus. D Each element has a unique number of neutrons in its nucleus. Copyright Abuse. For general help, questions, and suggestions, try our dedicated support forums.
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