BIOL 1201 Chapter : Ch 1

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azuremammoth471

15 Mar 2019

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Chapter 1 themes in the study of life. About 1. 8 million species have been identified and named! With so many different species there are many similarities (see fig 1. 1). 1--- evolution is a central theme in biology. The ability to evolve is built into organisms. than another group. Conclusion: more good genes survive and therefore the population changes. If you put the 3 things together then it means that if you have the right genes that allow you to survive then you can pass those genes on. If you don"t those genes don"t get passed on as often. 2 --- life contains an order of structural levels with each level building on the levels beneath it. Organisms within a species are variable (e. g. , some are tall some are short) Variability means some are better suited to survival. Variability comes from the genes and genes are inherited. Genes are inhereited and passes on if that organism reproduces.

Related Questions

Describe the theory of natural selection Which of thefollowing BEST describes the theory of natural selection? CHOOSEONE

	1 The genetic make-up of apopulation gradually changes from one generation to the next.
	2 Living organisms change overtime.
	3 Each species produces many moreoffspring than can survive long enough to reproduce. The offspringthat do survive contain genes that are inherited from theparents.
	4 There is variation among themembers of a species. Some of this variation is geneticallydetermined and so can be passed on to future generations.
	5 Some individuals have genes thatincrease their chances for survival and reproduction. Theseindividuals are more likely to reproduce and pass on their genes,causing their genes to become more common in the nextgeneration.
	6 There is a struggle for existenceamong the members of a population.

amberleopard326

Why does sodium react so easily with chloride to make sodium chloride?

	A.	Both atoms have incomplete outer orbitals and they complete each other's when they combine
	B.	Sodium chloride is table salt, one of the most reactive molecules in living things.
	C.	Opposites attract.
	D.	Both atoms have outermost shells full of electrons.
	E.	Sodium chloride is highly explosive.

What is meant by the statement âlife is diverse?â

	A.	There are many living organisms on Earth
	B.	Each living thing is a unique individual.
	C.	All living things are related to each other.
	D.	There are many different kinds of living organisms on Earth
	E.	There are many places to live on Earth.

What is considered the fundamental unit of life?

	A.	DNA
	B.	Carbohydrates
	C.	A molecule
	D.	Nucleic acid
	E.	A cell

In evolution, why is it important that individuals vary from each other?

	A.	Variation allows some individuals to do better than others, so those variations are selected for.
	B.	If variations or mutations are extreme enough, new species can result.
	C.	Variations are important because individuals have to change through time.
	D.	Variations are important because they're inherited.
	E.	Variation gives every individual an equal chance of surviving so they can be selected for.

If every species on Earth came from some other species, if you look backwards in time, what is the logical conclusion?

	A.	Species do not change through time.
	B.	All species are unique.
	C.	Species cannot adapt to environmental changes.
	D.	All species will eventually go extinct.
	E.	All species are related.

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

BIOL 1201 Chapter : Ch 1

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