How Do Paleontologists Date Fossils?
Chapter 25 Homework
Interpreting Data As discussed in the text and shown in Figure , radiometric dating can be used to determine the age of biological materials. The calculation of age depends on the half-life of the radioisotope under consideration. For example, carbon makes up about 1 part per trillion of naturally occurring carbon. Fossils form by compression, petrifaction, impression, the formation of casts, and when organisms or parts of organisms are trapped in sediments, oozing sap, or tar. 2. Why will the fossil or younger than another. Absolute dating techniques, including radiometric dating, assign a range of dates that tell when a fossil formed. 8 Jul Interpreting Data: Radiometric Dating Scientists can use the percentage of carbon in a fossil's remains (relative to carbon) to estimate the age ANSWER: Correct Part B - Thinking critically French scientists used carbon dating to determine the age of prehistoric wall paintings in the Niaux caves.
Why does ice float? The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking three glucose molecules together by dehydration synthesis reactions? Primary Secondary Tertiary Quaternary. This image shows a triacylglycerol a dietary fat. A paleontologist is radiometrically dating three rocks from three different sites using the Potassium-Argon "clock", Part B - Radiometric Dating Masteringbiology has a half life of 1.
The data she has obtained is shown in the here below. Based upon these data, which rock is the oldest? You are collecting biological samples and bringing them back to the lab to determine the diversity of organisms present in the sample. Most of the species are already described, but you find one that you think is a new species.
It is a prokaryote. Which of the following would you find if it is a member of the Archaea, not a bacteria? The bacterium Streptococcus pneumoniae is the organism learn more here for bacterial pneumonia. It has a cell-wall that is predominately made of peptidoglycan and no outer membrane.
Rhodobacter sphaeroides is a purple bacteria. It usually gets its energy from sunlight and its carbon from organic molecules.
C radiometric dating is NOT used to estimate the age of fossils as it requires organic material which is not found in fossils as preservation results from mineral replacement of the original organic material for the test and is only effective to about 60, years into the past, far too little for fossil dating. Evolutionists cannot readily explain this. Extrapolating backwards puts a low upper limit on the age of life on earth. It enables the body to make Vitamin D.
If there is no sunlight, it can obtain energy from organic molecules. Therefore, this bacterium is: The Hawaiian Bobtail squid Euprymna scolopes is a small nocturnal marine invertebrate. It is best known for its light organ, which contains only one species of bacteria Vibrio fischeri.
The squid acquires these bacteria from the water shortly after hatching. These bacteria produce bioluminescence, which obscures the shape of the squid to help it avoid predators.
The squid provides nutrients for the bacteria. The relationship between the squid and the bacterium is: You are studying a sample extracted from a patient with a history of stomach ulcers and you suspect the cause is an infection due to Helicobacter pylori, a pathogenic species associated with this disorder. In this sample, you find cells with an outer membrane with lipopolysaccharides surrounding a thin layer of peptidoglycan. This species is most likely: Animals and plants are both living, eukaryotic organisms.
What is different about the ability of animals to respond to stimuli? All of these are senses that animals have but plants do not. How old is Earth? What was missing from the early atmosphere? Check this out change in beak size in this population of birds seen on graphic on previous slide happened because the birds with larger beaks: All of these are part of the process of natural selection that acted on this population.
Which component of a water molecule is Part B - Radiometric Dating Masteringbiology electronegative? What determines the cohesiveness of water molecules? When water vaporizes, which bonds are broken? The hydrogen bonds between water molecules. The molecule in the center, surrounded by water molecules is most likely During digestion, various enzymes are secreted into your digestive tract to break down macromolecules.
You isolate a strain of bacteria and find that it obtains its carbon from carbon dioxide and its energy from complex carbon. Which level of protein organization describes the interaction of more than one polypeptide chain to make a functional protein?
Some patients with Parkinson's disease have a more uncommon genotype at the ACT gene. They are homozygous for a form of that protein in which more info is an alanine at position 15 rather than a threonine. This substitution results in a protein that is: Which of these is not a function of cholesterol in your body? It stores chemical bond energy that can be converted to ATP.
It is a precursor molecule for steroidal hormones like estrogen. It is a molecule found in cell membranes.
It enables the body to make Vitamin D. It is used to make the bile acids that are produced for digestion. The small naturally occurring fires that occurred before about Removed undergrowth and small trees in the forest but left large trees and preserved habitat for wildlife.
Eukarya Archaea closer related to eukarya then bacteria Bacteria. DNA replication first proteins produced cell growth fast, every 20 minutes. Bacterial conjugation is a form of sex. True because all forms of sex, including conjugation, create a new combination of genetic material. CO2 and chemical sources.
Sweat plays an important role in thermoregulation due to the high heat of vaporization of water. That is, it takes energy to not only raise the temperature of water, but additional energy is required to make the phase change from water to gas.
In individuals with HED hypohidrotic ectodermal dysplasiasweat gland numbers are reduced. Predictably, what symptoms occur in HED-affected individuals?
Lipids are predominantly hydrophobic because. You are an archaeologist who has just found an ancient fire ring containing charcoal fragments. You send these fragments to the lab for carbon analysis. You use years as the half-life of carbon Be sure you could also answer this question if you were asked to date the sample if You find an ancient spear and apply dendrochronological methodology to discover that its growth ring pattern corresponds article source 5, years ago.
You are not satisfied with this single method and want to corroborate the date using another approach. You turn to carbon methodology.
Chapter 7 Homework.pdf - Ch 07 key concept HW 1 of 10...
If the dendrochronology data are correct, how much carbon compared to modern wood should be present in the spear? Which of these individuals is likely to be most successful in an evolutionary sense? In this molecule, what type of bond is found between the oxygen and hydrogens?
Radiocarbon Dating - Online hookups!
Which property of water allows dogs to cool themselves by panting? Which property of water allows a paper towel to pick up a puddle of water? Which of the following is not attached to the central carbon atom in an amino acid?
Which part of an amino acid is always acidic?
Too little helium in the upper atmosphere. If the oceans had started with no salt they would have reached their current salinity in a short time. Express your answer numerically. You use years as the half-life of carbon This species is most likely:
Which of the following statements about the formation of polypeptides from amino acids is true? A bond forms between the carboxyl functional group of one amino acid and the amino functional group of the other amino acid.
T or F Enzymes in the digestive tract catalyze hydrolysis reactions. Which of the following hydrocarbons has a double bond in its carbon skeleton? The age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactive isotopes. The time click here for half of a radioactive isotope to decay is called the half-life of that isotope.
For example, the isotope carbon has a half-life of 5, years. If a fossilized leaf contains If the half-life of carbon is about 5, years, then Part B - Radiometric Dating Masteringbiology fossil that has one-sixteenth the normal proportion of carbon to carbon should be about how many years old?
How many half-lives should have elapsed if 6. Approximately how far back in time does the fossil record extend? Hospitals can serve as sources of infections. Many of these infections are especially difficult to treat because hospital bacterial strains are often very resistant to antibiotics. Which of the following might explain the high incidence of antibiotic resistance in hospital bacterial strains?
Prokaryotes and eukaryotes that exhibit taxis typically respond to some environmental cue. If the cue is a chemical, such as a here source, then the organism typically responds in a positive manner and moves toward the source in a response referred to as positive chemotaxis. Conversely, if the chemical is noxious, then the organism typically responds in a negative manner and moves away from the source in a process known as negative chemotaxis.
Other environmental cues are also used e. Upon wounding, these bacteria can invade the bloodstream and lead to a variety of diseases. This is one example of an opportunistic infection. From what you should now know about bacterial taxis and nodule formation, predict how a Rhizobium would respond to a flavonoid.
Cholera can kill quickly.