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BIOL 1001 Exam Week 4 / BIOL1001 Week 4 Exam / BIOL 1001 Review Test Submission: Exam Week 4 (Latest): Introduction to Biology (ANSWERS VERIFIED 100% CORRECT)
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Which of the following people conducted the experiments that demonstrated that DNA is the
together
A friend accidentally sends an email to you that contains a computer virus from his computer. Without knowing it, you infect your computer with the virus when you open the email. This process of spreading the computer virus using emails is most like which of the following
- :initiation of a new RNA molecule
successful ways to rid infected plants of a virus.
growth
of a new strand
the rapid lysis of all infected cells
reproduce inside the host cell's mitochondria
Exposure to the HIV virus doesn't necessarily mean that a person will develop AIDS. Some people have genetic resistance to infection by HIV. Dr. Stephen O'Brien from the U.S. National Cancer Institute has recently identified a mutant form of a gene, called CCR5, that can protect against HIV infection. The mutation probably originated in Europe among survivors of the bubonic plague. The mutated gene prevents the plague bacteria from attaching to cell membranes and, therefore, from entering and infecting body cells. Although the HIV virus is very different from the bacteria that causes the plague, both diseases affect the exact same cells and use the same method of infection. The presence of the mutated gene in descendants of plague survivors helps prevent them from contracting AIDS. Pharmaceutical companies are using this information as the basis for a new approach to AIDS prevention. This would be very
Which of the following assumptions or observations is not part of Darwin's idea of natural
of random chance Lyell's book Principles of Geology, which Darwin read on board the H.M.S. Beagle, argued in
that act gradually and are still acting
reproductive success based on inherited characteristics Broccoli, cabbages, and brussels sprouts all descend from the same wild mustard and can still
Humans share several features with salamanders. Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species' early embryos are very similar; and where the salamander has a
During the 1950s, a scientist named Lysenko tried to solve the food shortages in the Soviet Union by breeding wheat that could grow in Siberia. He theorized that if individual wheat plants were exposed to cold, they would develop additional cold tolerance and pass it to their offspring. Based on the ideas of artificial and natural selection, do you think this project worked
traits. Lysenko assumed that exposure could induce a plant to develop additional cold tolerance and that this tolerance would be passed to the plant's offspring
through genetic drift and restored by gene flow
selection starts with the creation of new alleles that are directed toward improving an organism's fitness The frequency of homozygous dominant individuals in a population that is in Hardy-Weinberg
Frequency-dependent selection, as seen in the case of the scale-eating fish in Lake Tanganyika,
:intersexual selection
frequencies change over a span of generations
bat and the flipper of a whale
- :the bottleneck effect
ostrich
:evolution
Which of the following imaging techniques is best suited for visualizing fine anatomic detail in
Some animals have evolved a body form that allows them to run very fast, while others run more slowly. Whereas a cheetah can run at speeds over 50 mph, an elephant can barely run at
:the ratio of muscle to their total body mass
their toes that form bonds with the wall and ceiling surface.
disorders Which of the following imaging techniques is used for visualizing areas of high or low metabolic
fried egg
Under normal conditions, blood sugar levels are controlled within a narrow range by negative feedback. Two hormones are involved in maintaining blood sugar levels at the set point (about 90 mg of glucose/100 ml of blood). When blood sugar levels rise above the set point, the hormone insulin signals the liver to absorb the excess sugar. When blood sugar levels drop below the set point, the hormone glucagon signals the liver to release its stored glucose to the bloodstream. In juvenile onset diabetes, the body doesn't produce enough insulin and insulin supplements are required. If you hadn't eaten for several hours, which hormone would be
Which of the following is closely associated with the digestive, respiratory, and urinary systems?
- answers - :the circulatory system
sparsely scattered through a nonliving matrix
:function Which of the following is formed from a matrix of collagen fibers embedded in a hard mineral
housed in a membrane-enclosed nucleus
- :a drug that prevents mitotic spindle from forming The creation of genetically identical offspring by a single parent, without the participation of
When animal cells are grown in a petri dish, they typically stop dividing once they have formed
Which of the following features likely accounts for the difference between plant and animal cell
You are asked to culture an unidentified sample of animal tissue. You notice that the cells seem
chromosomes are more complex than those of eukaryotes Prior to mitosis, each chromosome of a eukaryotic cell consists of a pair of identical structures
syndrome is least likely to be seen in the infants of mothers over 40 Independent orientation of chromosomes at metaphase I results in an increase in the number
Which of the following is a feature of plant cell division that distinguishes it from animal cell
Mr. and Mrs. Smith have three sons in elementary school. Two of their children are progressing normally, but their last son, Charles, has been much slower than his siblings at developing speech and language skills. His parents are concerned that he has a learning disability and decide to investigate further. Since some learning disabilities can be genetically based, their pediatrician recommends a chromosomal analysis. The results show that Charles has a trisomy of the sex chromosomes, diagnosed as XYY, which is caused by nondisjunction in the formation of the father's sperm. The nondisjunction resulted in an extra copy of the Y chromosome. The extra copy was passed on to Charles during fertilization. Most often, this chromosomal change causes no unusual physical features or medical problems, but those with trisomy of the sex chromosomes do have a higher than normal risk of delays in learning development. During whic
- answers - :anaphase II During which phase of mitosis do the chromosomes line up on a plane equidistant from the two
Which of the following statements best explains why dominant alleles that cause lethal
individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink
The phenotypic ratio resulting from a dihybrid cross showing independent assortment is
All the offspring of a cross between a black-eyed mendelien and an orange-eyed mendelien have black eyes. What is the expected phenotypic ratio of a cross between two orange-eyed
villus sampling is typically performed later in the pregnancy than amniocentesis Imagine that beak color in a finch species is controlled by a single gene. You mate a finch homozygous for orange (pigmented) beak with a finch homozygous for ivory (unpigmented) beak and get numerous offspring, all of which have a pale, ivory-orange beak. This pattern of
All the offspring of a cross between a black-eyed mendelien and an orange-eyed mendelien have black eyes. This means that the allele for black eyes is ________ the allele for orange eyes.
- answers - :dominant to You conduct a dihybrid cross. A ________ ratio would make you suspect that the genes are
:the blending hypothesis suggest that all of the traits of the offspring come from either the mother or the father
chromosome and one Y chromosome
:hypercholesterolemia According to scientist about what percent of men currently living in Central Asia may be
A colorblind woman marries a man who is not color-blind. All of their sons, but none of their
very different from the bacteria that causes the plague, both diseases affect the exact same cells and use the same method of infection. The presence of the mutated gene in descendants of plague survivors helps prevent them from contracting AIDS. Pharmaceutical companies are using this information as the basis for a new approach to AIDS prevention. This would be very
→ alters host cell DNA → host cell produces copies of virus We would expect that a 15-nucleotide sequence ending with a stop codon will direct the
Consider the following sentence: "The dog did not eat." Which of the following variations of this
Consider the following sentence: "The dog did not eat." Which of the following variations of this