Which statement is correct about the results of the Hershey-Chase experiment with the T2 Virus?
Radioactively labeled Dna was found in the bacteria, notin the virus coats
If a species contains 27% A ints DNA, what is the percentage of guanine it would contain?
Which of the following have nitrogenous bases correctly paired in DNA?
Adenine- Thymine; Guanine-Cytosine
A single nucleotoid contains
Sugar, a phosphate, and a nitrogen containing base
DNA replication is considered semi-conservative becuase
each daughter will contain one new and one old DNA strand
In Figure 24.1, if adenine is located on strand 4, then one stand 2 at the same location ________ must be present
Which of the following is NOT true about RNA?
RNA is single stranded
The function of transfer RNA is to
Act as the site for pretein synthesis
Which of the classes of RNA molecules carries the genetic information from DNA as it is needed for the construction fo a protein?
Prior to protein synthesis, the DNA
Serves as a template for the production of mRNA
In modern biochemical genetics, the fow of inherited information is from
If one strand of DNA has the base sequence CAGCAA, the complementary strand has which of the following sequences>?
Transcription of part of a DNA molecule with a nucleotide sequence of CAACAACTT results in a mRNA molecule with the complementary sequence of
An intervening sequence of DNA that is not expressed is called a(n)
The genetic code consists of _____ bases that stand for one amino acid.
The correct sequence of events in the production of a polypeptide is
Gene mutations are
Alterations in the normal sequence of bases in DNA
If the normal nucleotide sequence was TAGGCATG, what type of gene mutation is present if the resulting sequence becomes TACGGCATG
Frame shift, and Addition Mutation
Specific DNA sequences that have the ability to move within and out of chromostomes are called
A missense mutation is one that
Changes one amnio acid to another
Gel electrophoresis uses an electrical field to seperate DNA fragments based upon their ______
A cluster of prokaryotic genes under the control of one regulatory sequence is called
Eukaryotic transcription factors assist the ____ in binding to the _____
RNA Polymerase; Promoter
Which of the following levels of control involves the use of poly-A tail
Translation of mRNA
Which level of primary control in eukaryotic gene activity might activate or inactivate a protein after it is produced?
Which of the following is true about cancer cells?
They exhibit uncontrolled growth & They can form benign or malignant tumors
Which of the following normally stimulates cell division, but when mutated can result in cancer?
All of thse are considered carcinogens EXCEPT
Cereals, fruits, and vegetables, including cabbage
The earliest forms of life on earth are found in rocks
3.5 billion years old
Which of the following kinds of olecules is thought to have been absent from the primitive reducing atmosphere?
In a liquid environment, "protocells" or liposomes can form spontaneously from ______
The first eukaryotic cells probably arose about _____ billion years ago
Have occurred about 4 or 5 times in fossil record, due in some cases to catastrophic changes
Anatomical features that are fully developed and functional in one group of organisms but reduced and functionless in a smiliar group are termed
Almost all living organisms use DNA, ATP, and the same DNA triplet code. This is an example of evolution based on
What is the term used to describe the accumulation of small changes in the gene pool of a species over time
Which of these conditions is among the requirements of the Hardy-Weinberg equilibirum?
A variety of genotypes and phenotypes in a population is usedful becuase it
Allows the species to survive if the environment chagnes
The Amish of Lancaster, PA. have a higher frequency of an unusual form of dwarfism than the population at large. This is probably an example of
A founder effect
If there is a change in the allele frequency of a gene pool due to chance, primarily in a small population, it is termed...
The ultimate new source of alleles in a populations is
Lamarck's theory of evolution included the idea that
The continual stretching of giraffes necks to reach leaves led to longer necks
Which of the following is/are true about natural selection
on average, it facors the survival of more young with adaptive characteritics
Which type of natural selection increases the frequency of an intermediate phenotype?
What is the correct order of the steps regarding allopatic speciation
One species- geographic isolation-reproductive isolation-two species
The new model of evolution that proposes that organisms spend most of their time in fairly unchanging forms and undergo occasional bursts of speciation is called
The three shapes of bacteria are
Bacillus, coccus, and sprillium
The response of bacteria that allows them to be identified as Gram-positive or negative is due to
Whether their cell walls ave a thin or thick layer of peptidoglycan
Which statement is false about bacteria
They contain a single, circular DNA molecule as the genetic material
Whcih type of prokaryotes are able to live inthe most extreme environments
Single-celled eukaryotes belong to the kingdom
The kindgom Protista includes all of the following kinds of organisms EXCEPT
The _____ aglae shre most of the characteristics of plants
Single celled, animal like eukaryotes would belong to which of these?
Eukarya, Protists, Protozoans
Which of the following is NOT a fungus?
Which protist is NOT correctly linked to the type of movement it shows?
Sporozoa- Flexing the pellicle
Which includes the parasites that cause African sleeping sickness?
A member of the sporozoan group of protists is
Molds and mushrooms belong to the Kingdom
Which of the following are single celled, photosynthetic organisms
An ecosystem contains
both the living organisms and the abiotic components of the environment
The study of the interrelationships of plants and anmials with each other and with their environment is known as
A number of populations of different species interacting with one anothe is called
The base of an ecological pyramid represents the
producer trophic level
Sunlight that passes throught the atmosphere, is absorbed, and is re-radiated back as longer wavelength heat waves that are trapped by gases in the atmostphere, represtents
the greenhouse effect
In the phosphorus cycle
-Phosphorus never enters the atmostphere -Phosphate only becomes available whena geological upheaval exposes sedimentary rocks -phosphate is often a limiting nutrient in most ecosystems -Phosphate detergents are a major source of eutrophication
Which of the following statements is NOT true about ozone?
Ozone is the same as molecular oxygen, O2
In the carbon cycle, carbonis returned to the atmosphere by
respiration of animals and plants
Climate is due to temperature and rainfall that in turn determined by
-Variations in the solar radiation received on a spherical earth -The tilt of the earths axis as it roates about the sun -The distribution of landmasses and oceans -the topography or landscaep, such as mountains
The following number of aunt species were contine in these biomes. The ost likey reason for the number of ant species is list is
The amount of photosynthetic production, length of the wram season, and diversity of plants
The largest communities on land are
In th water cycle, evaporated equatorial water that rises and does not immediatly rain bcak down proceeds to move
To about 60deg north or south and then cool and condense, supporting a band of moist vegitation
The features that determin how much rain fall on specific areas aof a continaent are
-latitude -mountain ranges -proximity to oceans
Which represents a plausible primary succession sequence?
Grass to tall weeds to shrubs to forest
Which of the following is/are biotic factor in an ecosystem?
The food Chain
When the number of births exceeds the number of deaths, this results in
Optimal population growth does not usually occur because of
-Accumulation of waste products -Predation -Competition -Limited access to food and water ANSWER: Any of the above are limiting
Biotic potential depends on all of the following Except
How many different mates each individual has
A population with rapidly expanding exponential growth would be best represented by a graph with a/an ______ -shaped curve
population size is believed to level off at the _______ of an environment where resources become limited
Interactions between two species as both attempt to use the same environmental resources is
Interaction between two species in which one feeds on the other is
In a predatory-prey cycle
A decline in the numbers of prey cuases a decline in the number of predators
Which statement is not true about parasitism
Parasites are always severe and usually kill a host
The primary producers in terrestrial ecosystems are the _____, whereas in fresh water and saltwater ecosystems it is ______.
Green Plants, Algae
Which of the following organisms would be considered a decomposer
Animals that feed on both plants and other animals are called
The only heterotorphs required in an ecosystem are
Energy flow in an ecosystem begins with
Energy flow in an ecosystem is NOT cyclic becuase energy
no longer useful and is lost when it is converted to heat
If we weighed all of the organisms at each level of this food web, which would be the heaviest
Grass and Trees
As the latitude increases, which biome sequence would be present
Which of the following is NOT considered to be primarily a treeless biome?
Which of the following is a true statement?
The Taiga is a coniferous forest that circles the earth in the northern hemisphere
Trees such as oak and maple and animals such as foxes and deer are found in the
temperate deciduous forest
Which biome has both a high temperature and plentiful water year around?
An african tropical grassland that varies cook, dry seasons with hot, rainy seasons is the
Which would be characterized by rainfall under 25cm/year, very hot days, cold nights, and spiney-leafed plants?
Agriculture and industry are responsible for the most consumption of water? T or F
The use of wheat, corn, rice, and other crops modified from wild ancestors is an example of _______ value drawn from biodiversity.
Most of our energy come from which of the following sources?
Coal, Oil, and Natural Gas
Green house gases get their name because they
Prevent infared energy from radiating away from the earths surface
Which of the following is most correct concerning loss of biodiversity and extinction?
There are a variety of causes to extinctions and an animal or plant may go extince due to a different combination of factors, but primarily loss of habitat
Which of the following statements is NOT true about tropical rain forests?
Tropical reain forest land contains rich soil that is desirable as farmland
Intorduction of alien or exotic species into a new ecosystem occurs by
-Colonization when new settlers arrive in an area - Accidental transport by ship or plane without anyones knowledge -Agricultural and horticultural activities
Which is NOT an example of an alien or exotic spcies?
Zebra mussels introduced to the Great Lakes Dandelions planted by pioneers as salad greens The mongoos brough to hawaii to control Rats The brown tree snake in guam Answer: all of the examples are introduced alien species
Which of the following would be a logical step toward becoming a sustainable society