Biology

The doctrine that there are functionally two distinct ways in which our eyes work, the photopic, associated with the cones, and the scotopic, associated with the rods, is known as the ______ theory of vision.
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In exploring for coal deposits, geologists sometimes look for fossil indicators: fossilized remains of Carboniferous plants. Which of the following combinations in a sample would suggest the presence of rocks that might bear coal beds?1. mosses and liverworts, but no vascular plants2. angiosperms and mosses3. lycophytes and gymnosperms4. lycophytes and tree ferns
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The division of the nervous system that allows the brain and the spinal cord to communicate with the sensory systems of the eyes, ears, skin, and mouth, and allows the brain and spinal cord to control the muscles and glands of the body is called the ________.
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Scientists use a standardized taxonomic system to separate organisms into hierarchical groups based on similarities and differences in their structural and genetic characteristics.Which of the following best explains why a standardized classification system is important to the scientific community?It allows different kinds of organisms to be easily identified based on their characteristics.
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A bunch of ducks fighting over food is an example of?
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an ionic bond forms when
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Drugs that have the same effect as acetylcholine, which causes the pupil to constrict, are called __________ drugs.
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Which endocrine glands arouse the body, regulate salt balance, adjust the body to stress, and affect sexual functioning?
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At an initial examination in Oxford, Mass., migraine headache was found in 5 of 1,000 men aged 30 to 35 years and in 10 of 1,000 women aged 30 to 35 years. The inference that women have a two times greater risk of developing migraine headache than do men in this age group is:___________a. Correctb. Incorrect, because a ratio has been used to compare male and female ratesc. Incorrect, because of failure to recognize the effect of age in the two groupsd. Incorrect, because no data for a comparison or control group are givene. Incorrect, because of failure to distinguish between incidence and prevalence
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Why are government laws and agencies needed to monitor our impact on theenvironment?
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Thermoreceptors detect body temperature and send impulses to the brain for analysis. If body temperature is low, the brain will signal skeletal muscles to perform brief, repeated contractions to help generate heat. In this example, what is the effector? A. Skeletal muscles B. Body temperature C. Brain D. Thermoreceptors
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Which type of operon, an inducible one or a repressible one, would an organism likely use to produce enzymes and other proteins required for the cell to manufacture a molecule needed from smaller molecules in the environment?
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Nervous tissue can be found mainly in the ____________ , spinal cord, and in the limbs as ____________ .
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If organisms A, B, and C belong to the same class but to different orders and if organisms C, D, and E belong to the same order but to different families, which of the following pairs of organisms would be expected to show the greatest degree of structural homology?A) A and DB) B and DC) B and CD) D and E
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Describe how the lac operon functions and explain how it permits E. coli to produce the enzymes needed to break down lactose when it is present in the bacterium.
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Which practice could help an agrarian society prevent crops from spoilingbefore they can be brought to market?OA. Developing irrigation techniques that conserve waterOB. Cutting down forests to produce more croplandOC. Switching from gasoline-powered to electric vehiclesOD. Creating more efficient methods of food preservation
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Which answer choice correctly describes why metals are good conductors of thermal energy?
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The ___________ is an important element of the drug experience because it affects how much of a drug reaches its site of action and how quickly it gets there.
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If you want to use PCR technique to amplify markers located on six unlinked locations on the chromosomes, how many total unique primer sequences do you need? A. 1 B. 3 C. 6 D.8 E. 12
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Corn rust is a pathogen caused by fungus that can attack corn plants and cause wide spread damage to this staple crop. Much of the midwest farmlands are used to grow corn. What method will best mitigate the impact of corn rust on this important crop?A)Corn should only be grown in rainy season so its not needed to integrate landB)Corn should be grown in cold season C) CloningD) Genetic variation so at least some plants would be resistent to corn rust
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what are nociceptors ? what is different about the 2 types of them ?
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In a hypothetical situation, a certain species of flea feeds only on pronghorn antelopes. In thewestern United States, pronghorns and cattle often associate with one another in the same openrangeland. Some of these fleas develop a strong preference for cattle blood and mate only withother fleas that prefer cattle blood. The host mammal can be considered as the fleashabitat. If thissituation persists, and new species evolve, this would be an example of _____.A) allopatric speciation and gametic isolationB) sympatric speciation and temporal isolationC) allopatric speciation and habitat isolationD) sympatric speciation and habitat isolation
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How has the study of mitosis affected scientists' knowledge of cancer?It led to a study of how to induce cancer cells to divide more rapidly.It led to an understanding of how cancer cells divide so rapidly.It led to the development of contact-inhibition regulators.It led to the discovery of how to prevent cancer cells from dividing.
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Mario is highly afraid of spiders. Which part of the brain would be activated if he were to enter a room that had a lot of spiders?
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