BIOL 103 Chapter Notes -Strontium, Reverse Transcriptase, Igneous Rock

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purplemammoth851

27 Sep 2013

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Contents: origin of life on earth, history of life on earth. Biological evolution is a process that involves genetic changes that occur over one to many generations: origin of life on earth. Stage 1: several scientific hypotheses have been proposed to explain the origin of organic molecules. Oparin and haldane independently proposed that organic molecules nucleotides and amino acids arose spontaneously under conditions that occurred on ancestral earth. Little oxygen was present and atmosphere contained inorganic co2 , organic molecules, and water vapour. There are many hypotheses on how nonliving matter originated: Put water vapour from boiling water into chamber of h2, ch4, nh3 and inserted 2 electrodes that sent electrical discharges to simulate lightning bolts. Condenser jacket cooled some gases and droplets formed were tested for chemical analysis. Found formation of hcn and ch2o, precursors of organic molecules like amino acid glycine.

Related Questions

QUESTION 19

Among all protostomes, which morphological trait is most varied?

		type of symmetry
		type of body cavity
		number of embryonic tissues
		type of development

1 points

QUESTION 20

Nematodes are acoelomate animals.

True

False

1 points

QUESTION 21

The first genetic material on Earth was probably __________.

		DNA produced by reverse transcription
		DNA molecules whose information was transcribed to RNA
		protobionts
		self-replicating RNA molecules

1 points

QUESTION 22

Free point. Mark "true"

True

False

1 points

QUESTION 23

Which of the following is a characteristic of a flagellate?

		The use of pseudopods as feeding structures.
		They are often multinucleate.
		They can exchange genetic material with other ciliates by the process of mitosis.
		Most live as solitary autotrophs in fresh water.

1 points

QUESTION 24

The chelicerates have 2 pair of antennae.

True

False

1 points

QUESTION 25

Nematoes and arthropods both _________________.

		develop an anis from the blastopore formed during gastrulation
		are suspension feeders
		grow by shedding their exoskeleton
		have ciliated larva

1 points

QUESTION 26

If a lung were to be found in a mollusc, where would it be located?

		incurrent siphon
		mantle cavity
		visceral mass
		excurrent siphon

1 points

QUESTION 27

True segmentation (metamerism) evolved 3 seperate times.

True

False

1 points

QUESTION 28

The first coelomate animals are the _______________________________.

		Nematoda
		Platyhelminthes
		Mollusca
		Arthropoda

1 points

QUESTION 29

Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?

		How can amino acids, simple sugars, and nucleotides be synthesized abiotically?
		How did RNA sequences come to carry the code for amino acid sequences?
		How could polymers involving lipids and/or proteins form membranes in aqueous environments?
		How can RNA molecules act as templates for the synthesis of complementary RNA molecules?

1 points

QUESTION 30

The greatest number of endemic species is expected in environments that are _____.

		easily reached and ecologically diverse
		isolated and show little ecological diversity
		isolated and ecologically diverse
		easily reached and show little ecological diversity

1 points

QUESTION 31

A population of organisms will not evolve if _____.

		all individual variation is due only to environmental factors
		the environment is changing at a relatively slow rate
		the population size is large
		the population lives in a habitat without competing species present

BIOL 103 Chapter Notes -Strontium, Reverse Transcriptase, Igneous Rock

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