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Homeostatsis in single celled organisms, maintained through proper functioning of:
organelles
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In a stable ecosystem, each niche is usually occupied by only one species. The species occupying a particular niche is able to continue to remain there as a direct result of:
favorable adaptations
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When exposed to UV light, human skin cells produce the protein melanin. Melanin protects skin cells from UV damage. This is an example of:
environmental factors affecting gene expression
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The pancreas contains cells that secrete insulin. Only these cells produce insulin because:
different cells use different parts of the genetic information that they contain
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In humans, two organ systems work together to move oxygen throughout the body and deliver it to cells. Which system directly delivers oxygen to body cells?
circulatory
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Turtles populations are decreasing, the decline may lead to negative effects on other species. Which statement best summarizes
living organisms interact with and are dependent on their environment and each other
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Which set of substances are molecular building blocks that directly form some of the complex organic molecules present in humans?
glucose and amino acids
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The main function of (picture of DNA strands splitting apart) is to
provide exact copies of the genetic code before cell division
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Which interaction is an example of competition between two species?
mice and chipmunks eating sunflower seeds at bird feeder
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One important reason that humans have such a significant effect on Earth's ecosystems is that humans:
can modify the environment through technology
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Mutations can be beneficial to a species because:
can lead to some members of a species having favorable traits in a changing environment
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within ten years after the introduction of a new mosquito spray, very few of the descendants (children) of the targeted mosquito populations were killed by the usual dose of the spray. The best explanation for this is that....
existing variations in the mosquito population provided resistance to the spray
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once implanted into a recipient, bio engineered blood vessels made from plastic material become covered with persons own cells. An advantage of this is:
they do not trigger an immune response
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messages btwn parts of the body are carried by a series of nerve cells, not in direct contact with each other. (picture) How is the message delivered even though the cells are not touching?
The cells communicate with the use of chemical messengers btwn them
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Why do freshwater (lakes) fish die in salt water (ocean)?
They become severely dehydrated due to the process of diffusion
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cute fish/lizard looking thing, axolotl, can regenerate parts of its body, the regeneration involves the process of:
mitotic cell division
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Which would most likely control an insect pest and be the least harmful to the environment?
using traps baited with sex hormones that attract he insect pest
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Which statement concerning the functioning of cells is correct?
Mitochondria transfer energy from organic compounds to form ATP molecules
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(picture of burnt down forest)
what is most likely expected to occur to this ecosystem in the future?
the ecosystem will eventually restore itself and will be similar to the original
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(picture of kitties)
Kittens in the same litter often have similar characteristics because they
inherited similar genes
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damage to which structure would directly interfere with the nutritional needs of a developing embryo?
placenta
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The body's inability to regulate blood pH could affect
enzymes that function within the circulatory system
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Test anxiety and stress can trigger many responses in the human body like sweating and increased heart rate. These physical responses to increased stress are examples of:
feedback mechanisms
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A self sustaining ecosystem in a glass tank must include:
producers, decomposers, light, and H2O
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Scientists examined 39 tree species, and found that they could regulate leaf temperatures. So leaves cooled themselves in hot air and warmed themselves in cold air.
This is an example of:
maintain homeostasis by responding to environmental change
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A sea slug has a relationship with algae. The sea slug incorporates algae into its tissues so that the slug can get energy from the sun. Which structures from the algae would the sea slug need to take in to accomplish this?
mitrochondria
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which three processes usually result in the greatest variety of possible gene combinations?
mutation, meiosis, and fertilization
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All the genetic information necessary for the growth and development in a sexually reproducing animal is present in
zygotes
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(picture of camel and list of its features)
which statement best describes these camel characteristics
they have adaptive value for the camel
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Current evidence has indicated that increase in global temperature, equals more heath problems. Worldwide efforts to stop rise in temp to...
protect resources for future generations
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sequence of correct interaction of organelles for protein synthesis:
(mom hint: N, GC, R, AAB)
nucleus->gene codes->ribosomes->amino acid bonding
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what would occur if Fallopian tubes were damaged or blocked?
The egg wouldn't meet with the sperm
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Which female structure supports the development of the fetus
Uterus
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how do plants control water loss?
actions of the guard cells in their leaves
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(chart of deer population in two years, year 1 is less then year 2)
reason year two is more is because there are fewer?
predators present
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A person refuses to get a vaccine because they claim it will cause them to get the virus. This is incorrect because the vaccination contains only...
parts of the virus that triggers the immune system to fight the virus
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What organisms carry out autotrophic nutrition?
plants and trees
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explain why a decrease in one population of animals would not necessarily result in an increase in another:
predators
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The best way to reach a more reliable conclusion for a study is to collect data from a
large number of participants and then average the data
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What does ATP stand for?
Adenosine Triphosphate
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What is the limiting factor?
an environmental factor that is important in restricting the size of a population
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What is DNA replication?
DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule
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Which two body systems provide humans with the raw materials needed for cells to release energy?
digestive and respiratory
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An example of an activity that best contributes to maintain homeostasis in an organism is a
response to a vaccination
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The differences in the physical characteristics of a cloned animal are most likely the result of
environmental influences
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which situation is an example of an organism responding to an abiotic factor
plants in a forest grow toward areas where there is more sunlight available
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what is abiotic factor?
An abiotic factor is a non-living element of the environment that influences the way organisms and ecosystems function
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what is genetic engineering?
Genetic engineering aims to modify the genes to enhance the capabilities of the organism beyond what is normal, corrects mutations
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Many animal populations living in a particular area would most likely have...
similar physical requirements
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Cells posses structures that perform specific jobs. Name a big one:
Mitochondria provide energy for cell processes.
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What is cellular respiration?
- Cellular respiration is a metabolic pathway that uses glucose to produce ATP, an organic compound the body can use for energy
- (watch a video)
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what is enzyme synthesis?
all enzymes are protein in nature, and their synthesis involves the linking together of amino acids in correct sequence (watch a video)
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What is active transport?
Active transport is the movement of molecules against a concentration gradient and requires energy from the cell.
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What should scientists look at to study the physical characteristics of an extinct animal?
fossil record
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Compared to sexually reproducing animals, asexually reproducing animals have what?
limited genetic variation
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An easy way to remember the difference between Mitosis and Meiosis is
Mi'T'osis and Me'I'osis, where the 'T' in 'Mitosis' stands for 'tall,' and hence, growth, whilst the 'I' in 'Meiosis' stands for 'intercourse,' and hence, sexual reproduction
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a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success is called?
Natural Selection
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Maintaining the stability in a ecosystem most likely depends on
a high level of diversity and multiple ecological niches
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Enzyme that helps digest carbohydrates
Amylase. It is made primarily in the pancreas and the glands that make saliva, and can be found at low levels in other parts of the body
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What are carbohydrates broken down into?
glucose/simple sugars
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what enzyme digests fats
Lipase
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what enzyme digest carbohydrates
Amylase
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what is an autotroph?
An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals
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