BIOLOGY 1M03 Chapter Notes - Chapter 1: Louis Pasteur, Progenitor Cell, Cell Theory

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blackgnat608

17 Sep 2013

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Chapter 1: biology and the tree of life. Biological science was founded with these key developments: These developments are unified by the concepts of ancestry and descent: a phylogenic tree is a graphical representation of the evolutionary relationships among species. These relationships can be estimated by analyzing similarities and differences in traits. Species that share distinctive traits are closely related and are placed close to each other on the tree of life. Evolutionary relationships among species (and cells) can be represented by phylogenic trees. How does one do biology (ask questions, generate hypotheses and predictions, and conduct experiments to test them) Theory: an explanation for a very general class of phenomena or observations. Cell a highly organized compartment bounded by a plasma membrane that contains concentrated chemicals in an aqueous solution: chemical reactions that sustain life occur in the cell.

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QuestionGroup: #31 Evolution

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Homework

Which of the below statements is NOT TRUE about human evolution?

While the total number of species that existed and the relationships among hominids is still unknown, some of the extinct hominids known today, however, are almost certainly direct ancestors of Homo sapiens.

Human evolution follows the mechanisms of natural selection.

Humans evolved from biological processes that are different from the processes that caused the development of other life forms on earth.

Many of the hominid species are close relatives, but not human ancestors.

Most hominids went extinct without giving rise to other species.

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QuestionGroup: #32 Evolution2

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______________ explains the process by which traits helpful in survival and reproduction become progressively more common in a population over the course of many generations.

Secondary metabolism

Darwinian theory of evolution

Evolutionary arms race

Biodiversity

Lemarkian theory of evolution

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QuestionGroup: #33 Natural selection

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Which of the following is considered to be "the most fit "from an evolutionary perspective?

a tiger who cares for his cubs, two of who live to adulthood.

a tiger who has a harem of many tigresses and one cub.

a tiger who is successful at capturing prey but has no cubs.

a tiger who has many cubs, twelve of which live to adulthood and they subsequently have cubs of their own.

a tiger who overcomes a new disease and lives to have four cubs.

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QuestionGroup: #34 Natural selection 2

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Which of the following is NOT a process of artificial selection?

(1),(2)

(1),(2),(3)

(1) Variation of traits within individuals

(2) Variation in some inheritable traits

(3) Breeders select animals with favorable traits

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QuestionGroup: #35 Evolution & us

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Homework

For bipedal movement in primates to occur, which anatomical changes had to take place?

The spine had to have a characteristic single curve

Thigh bone slopes outward from the hip to knee, placing feet under the center of gravity

The surfaces of the joints in legs and between vertebrae are enlarged

All of these are true regarding upright bipedal movement

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QuestionGroup: #36 Evolution & us2

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Neanderthal hominoids had which of the following characteristics?

To make art

Ability to speak

Ability to speak, make art, and were bipedal

Bipedalism

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QuestionGroup: #37 CNS

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Increasing the amplitude of a sound wave does what to the sound?

increases the amplitude

increases the decibels

Increases the harmonics

Increases the volume

Increases the pitch

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QuestionGroup: #38 CNS2

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Juan Manuel Marquez delivered a knockout punch to Manny Pacquiao. Manny cannot remember events that happened before the knock-out. What is this an example of?

Alzheimer's disease

Anterograde amnesia

Psychogenic amnesia

Retrograde amnesia

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QuestionGroup: #39 PNS

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The receptor hair cells in the cochlea respond to the frequency and amplitude of sound. Which group of receptors are most sensitive to sound?

Only those receptors that we normally do not use

Those that respond to low frequencies

Receptors respond equally to all frequencies.

Those that respond to high frequencies

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QuestionGroup: #40 Smooth/skeletal

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During skeletal muscle contraction where does ATP function?

Forms the cross bridges

Attaches to myosin

Causes the thick filaments to form thin filaments

Attaches to actin

Select the statements that correctly represent the theory ofevolution. Select all that apply.

Evolution is partly about inheritance. Evidence of evolution isseen in structures such as wisdom teeth and the tail bone inhumans. These structures are thought to be âleft overâ from ourancestors and no longer appear to have any essential function inmodern humans.

Natural selection means that todayâs organisms are perfectlyadapted after millions of years of fine-tuning. No further changesare necessary because of all the progress that has been made bynatural selection.

We can see evidence of past natural selection in adaptationssuch as the camouflage of moths perched on the bark of their hosttree. We can also see natural selection at work today if we trackhow populations change in rapidly changing environments.

The theory of evolution does not apply to life today. It isstrictly about the history of life: what happened in the past asseen in fossils.

Scientists disagree about the main ideas of evolutionary theorybecause of incomplete or conflicting evidence.

Question 2

Select one answer.

10 points

The ability or tendency of organisms and cells to maintainstable internal conditions is called

metabolism

homeostasis

emergent property

evolution

Question 3

Select one answer.

10 points

Why do organisms maintain fairly steady conditions within theircells and bodies?

They need to keep conditions stable so that they can obtainfood.

Organisms just change along with whatever is happening in theoutside world, which is usually quite steady.

They must maintain stable conditions to keep their enzymesworking and generally to enable the chemical reactions of life.

Unstable conditions will destroy the DNA in cells; this is themost important risk for a cell facing physical or chemicalstress.

Question 4

Select one answer.

10 points

An organism or cell exhibits ____________ when it maintainssteady internal conditions despite changes in the outerenvironment.

homeostasis

evolution

balance

natural selection

Question 5

Select one answer.

10 points

Which type of molecule best illustrates the very strongrelationship between structure and function in biology?

enzymes

oxygen gas

all kinds of organic matter

water

Question 6

Select one answer.

10 points

Which best expresses how nutrients and energy move throughlife?

Nutrients flow from sunlight to organic matter to heat. Energycycles among all life forms.

Nutrients cycle among all life forms. Energy flows from sunlightto chemical energy to heat.

Nutrients and energy both are continually recycled in a greatcircle of life.

Question 7

Select one answer.

10 points

Which of the following is not a recurring theme in biology?

Living organisms maintain homeostasis.

Energy flows through living systems while matter isrecycled.

Evolutionary processes explain both the unity and adaptivediversity of life.

All of these are recurring themes.

Question 8

Select one answer.

10 points

Which statement about evolution is FALSE?

According to evolutionary theory, you are related to abacterium, to a yeast cell, to a snake, and to a whale. In fact,you are related to every species now alive on Earth, and to fossilspecies like dinosaurs as well.

Evolution occurs constantly, without end; there is no endpointin evolution.

Natural selection acts on genetic differences within apopulation to cause evolution. Individuals do not evolve.

Natural selection is about slow but steady progress. Through it,populations constantly get better-adapted. When this process iscompleted for all populations, evolution will come to a stop.

Question 9

Select one answer.

10 points

Imagine you have a peanut butter sandwich in front of you. Thesandwich is an example of _______.

matter

energy

Question 10

Select one answer.

10 points

You provide your gut bacteria with a warm place to live. Theyprovide you with vitamins and other services. This most directlyrepresents an example of...

shared ancestry of all life

natural selection

homeostasis

interdependence of life

Check the Course Announcements at the beginning of the week following the deadline for Part 1 to discover exactly what happened to the deer population on the Kaibab plateau. This information is essential for completion of Part 2.

The second part of your project is to take what you've learned about the Kaibab forest ecosystem and write an accurate description of the boom and bust of this deer population, using correct ecological language. Consider as many of the aspects of these events as you can. Be sure to consider the effects on the other species in the ecosystem as well.

Refer to your on-line materials and the appropriate sections of your textbook. Your discussion should include (but not be confined to) consideration of all of the following concepts: carrying capacity, predator/prey relationships, population cycling, resource partitioning, competitive exclusion, fundamental and realized niches, food chains, food webs and trophic pyramids.

Note that the purpose of this exercise is for you to demonstrate to me that you understand these important concepts of ecology by utilizing them accurately and appropriately in the description of the disaster in the Kaibab forest. Your essay must include both clear indications that you understand the meanings of these principles and clear indication that you understand how these principles can be used to describe what happened to the ecosystem on the Kaibab plateau.

information given of part one: On the north rim of the Grand Canyon, an area called the Kaibab plateau, there is a conifer forest called the Kaibab forest. The forest's trees include pine, fir and spruce. Shrubbery includes a variety of willows, raspberries, etc. A hundred years ago, this forest was a stable ecosystem, housing, among other species, a population of about four thousand mule deer.

These deer were hunted by local Native Americans, who used them for food and other materials. They were also hunted by predators like pumas, wolves and coyotes.

In 1906, the US made this region into a National Game Preserve. With the intent of protecting the deer, hunting was forbidden. Bounties were paid for killing the pumas, wolves and other large animals that preyed on the deer. By 1925, more than 6000 predators had been killed, virtually wiping out the ecosystem's large predators.

*Read the instructions* for Part 2, then consider this additional information about the Kaibab forest.
There are some hints in here to suggest the *minimum* range of the subjects you need to discuss to explain this; You will need to read the chapters and the course materials to understand the meanings of these concepts, and to be able to use them to explain the Kaibab disaster. There are other important concepts as well--so keep your eyes open as you read. It wouldn't hurt to go back and read the original description in Part 1, either. And you may find it necessary to do some quick browsing in areas of your book not directly related to ecology. (For instance, you might just want to do some looking into the nature and importance of the bark and twig ends on a tree.) Do not neglect the on-line essays which are provided for you in this Unit. What you should *not* do is Google the Kaibab, or look it up on a source like Wikipedia. This is not about what you can *discover* about the Kaibab forest.
Your grade will depend upon how completely you convince me you understand the concepts involved in this description. This is your test on ecology--your goal is to convince me that you understand the concepts and terminology of the subject, and can apply them to a real life situation.
Before we go on to the new information, there are a few things that came up as I was grading the Part 1 submissions which I think I should mention, just to keep you from straying in some incorrect directions.
First, remember that your concern is the fate of the Kaibab forest in the *immediate* sense--over tens of years, not thousands. There are no evolutionary issues here, at least in the short term (and that's your concern right now). So we won't be talking about adaptive radiation.
Also, keep your focus on the *Kaibab forest*, not on other ecosystems. Oh, and remember that the Kaibab is pretty isolated--emigration really isn't a reasonable alternative for the species living in this forest.
And finally, until we get to Part 3, the only human interaction we are considering is the initial decision to put bounties on those large predators, which led to their near-extinction in the area. You will be thinking a bit about human hunters trying to control the deer population toward the end, but the rest of the time you're just concerned with the natural processes going on in the ecosystem.
Okay, now on to the actual description of what happened in the Kaibab Forest as a result of killing almost all of the large predators. Remember, your task in Part 2 is going to be to describe and explain all of this using the concepts of ecology which you are learning in Unit 2 of the course.
*****
The primary, most immediate outcome of the removal of the predators from the ecosystem was that the deer population exploded, because the loss of the normal predator populations removed a primary source of population control. And the expanding deer population ate a *lot.* [Hint: explaining this requires discussion of population cycling, predator prey relationships and carrying capacities.]
As the deer population got larger and larger, their impact upon their favored food plants became extreme. They ate a much larger percentage of each year's plant populations, and they ate a larger portion of each individual plant. They also began to eat more from the plants which they didn't like so well--plants normally consumed by other herbivores in the ecosystem. In the winter, the starving deer ate about anything remotely resembling food, including twigs and bark from trees. As a result of the destruction of many of the twig ends of the trees, the spring tree growth was inhibited (why?). The stripping of the bark caused the death of some of the trees (why?). The extreme browsing on the herbaceous plants caused shifts in the plant population diversity, as the deer drove many of their favored plants into extinction within the ecosystem. [Hint: Explanation here will need to include discussion of resource partitioning, competitive exclusion, and realized vs. fundamental niches.]
All of this also impacted upon the rest of the animals in the ecosystem, since many of them depended upon the same kinds of food the deer ate, or depended upon the foods that the deer were eating because they could no longer get the food they favored. Then of course, the smaller predatory species (like foxes and owls) depended upon the health of those populations of small herbivores (like rabbits and mice). [Hint: sounds like food chains, food webs and trophic pyramids come into this part.]
After a couple of decades, the ecosystem was quite altered. The plant community was very different from what it had been before, and the deer herd, though not extinct, was composed of significantly smaller and weaker deer than the herd from the 1890s. (This was partially due to their straightened circumstances re. food, but also partially due to the absence of predators. Why would the removal of the natural predators cause this change in the general vigor of the deer in the herd (and why would the substitution of *human* hunting not exert the same positive influence)?)
Okay, the next phase of your assignment is to describe all the things going on in this ecosystem using the proper terminology that you should be learning from studying this unit of the course. Note that your use of terms like, for instance, "resource partitioning" needs to show that you understand not just what the concept means, but how it is reflected in this specific ecological disaster. Feel free to discuss this as much as you want to on your Discussion Board. Don't ignore the little questions tucked into the above description, and pay attention to those hints. Your response must demonstrate proper understanding of these concepts and how they are demonstrated by the disaster in the Kaibab forest.
This is the largest part of your exam project; your response should reflect the fact that this is a 50 point "essay" question. You are given a lot of organizational clues and hints about what issues you need to include in the information above. Make use of those things.

BIOLOGY 1M03 Chapter Notes - Chapter 1: Louis Pasteur, Progenitor Cell, Cell Theory

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