Expert: Walter Hintz - 7/27/2006

Question
Hello,Please check my answers to my questions.Thanks

1. By studying the nucleotides in DNA, we get support for the theory of natural selection from observing that
A. what goes around, comes around
B. life has a great potential for creating diversity
C. geographic separation doesn't affect natural selection
D. genetics doesn't affect offspring

My answer is B

2. In a pond or lake, the limiting factor that may affect the growth of algae is the level of dissolved
A. phosphate
B. carbon dioxide
C. oxygen
D. nitrogen

My answer is A

3. One way in which unicellular organisms protect themselves from extinction is through a process called
A. transposition
B. recombination
C. transformation
D. segmentation

My answer is B

4. The term nitrogen fixation refers to the
A. application of fertilizer with nitrogen to farmland
B. release of sewage with nitrogen into waterways
C. conversion of nitrogen gas to a usuable form
D. vast amount of nitrogen present in the Earth's atmosphere

My answer is C

5. Over the history of the human population, the average increase rate of populations has been
A. arithmetic
B. deceptive
C. exponential
D. fluctuating

My answer is C

6. A clear-cut example of mutualism is found in
A. cows
B. lichens
C. night-flying moths
D. carnivores that feed on herbivores

My answer is B

7. In the grazer food chain, the carnivores are members of the _______ trophic level
A. first
B. second
C. third
D. fourth

My answer is C

8. If you were a biophiliac, which one of the following statements would best describe you?
A. You love life because of its beauty
B. You love biology for its own sake
C. You sense that what we don't know expresses what we do know
D. You sense the connectedness of all life

My answer is B

9.
Which one of the following items should be excluded from an explanation of the concept of Earth's carrying capacity?
A. Human ingenuity
B. Food production
C. Earth's recycling of environmental pollutants
D. The supply of resources

My answer is A

10. According to the theory of evolution, the feathers on a sparrow evolved from
A. hide
B. scales
C. joints
D. claws

My answer is B

11. Which of the following statements best illustrates one of Darwin's insights into the theory of natural selection?
A. Humans produce more offspring than our food supply can sustain
B. Natural selection necessarily eliminates all animals that are not swift and aggressive
C. Living creatures possess a built-in drive to become increasingly complex
D. The accumulation of minor adaptive traits, over time, leads to new species

My answer is D

12. If Charles Darwin were to sit down to debate Jean-Baptiste Lamarck, which one of the following arguments would Darwin be most likely to accept as sound?
A. Behind the theory of evolution is a preordained plan
B. A giraffe's neck gets longer when it must stretch to reach leaves higher up on a tree
C. It's likely that organisms, including bacteria, are always changing
D. Experiences acquired by an organism are passed on to its offspring

My answer is C

13. Which one of the following biomes would most likely be found near the equator?
A. Tundra
B. Tropical rain forest
C. Boreal forest
D. Temperate grassland

My answer is B

14. If you were a plasmid, you would
A. be able to reproduce by conjugation
B. serve no useful purpose even to so simple an organism as a bacterium
C. form a little circle and reproduce on your own.
D. eventually be reincorporated into your original nucleotide sequence

My answer is C

15. Which of the following environments is the most likely candidate for primary succession?
A. A forest reduced to ash by an intense fire
B. A newly formed volcanic island
C. Any environment that can be reached by wind-blown seeds that cross oceans
D. A weed-ridden, abandoned corn field

My answer is C

16. As a wildebeest herd migrated across the Serengeti, some of the animals died. The gene pool of this herd will
A. lose much adaptive DNA information
B. remain, on average, undisturbed
C. retain the most adaptive, or best, DNA information
D. both lose and gain adaptive DNA information

My answer is B

17. You've been assigned the task of finding ways to reduce global warming. After doing meticulous research, you report that decreasing the amount of _______ in the atmosphere would have a positive effect on both global warming and acid deposition
A. carbon dioxide
B. nitric acid
C. nitrogen
D. aluminum oxide

My answer is C

18. The largest number of organisms in a grazer food chain will be
A. herbivores
B. decomposers
C. plants and algae
D. omnivores

My answer is A

19. Regarding resources used by humans, which of the following statements is most accurate?
A. The remaining tropical forests could be destroyed within the period of a human life span
B. The important first step in addressing the limits of oil reserves is producing alternative fuels
C. Water shortages can most effectively be reversed by the use of ocean waters
D. Renewable energy sources will help, but they can't supply the energy we now get from fossil fuels like coal and oil.

My answer is C

20. Presently, all of the following areas are experiencing overpopulation except
A. Latin America
B. Europe
C. North America
D. Asia

My answer is B


Answer
You were doing fine until
#15 B. Primary succession begins on water or bare rock
#16 Natural selection tell us C is correct
#17 A Clobal warming results from increase in CO2
#18 The greatest number of organisms in any food chain are the producers (plants)

#19  I hate this question.  The term "most accurate" is arbitrary.  All answers look good to me