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Questions in biology

[Answered] What membrane divides the outer ear from the middle ear? A. cochlea B. auricle (pinna) C. tympanic membrane (ear drum) D. vestibule

[Answered] In the Functions of Buffers simulation, a good hypothesis would be: Artificial cytoplasm acts as a buffer. True or False

[Answered] Question 2 (Multiple Choice Worth 2 points) (05.03 MC) Over millions of years, hominid species learned to use and create tools that became more complex over time. They eventually harnessed fire for light, heat, and cooking food. Which of the following best explains what effect this had on hominid evolution? A. Hominid front limbs became longer in proportion to the rest of their body. B. Hominid brain size decreased as life became easier with the advent of tools. C. Hominid tooth size decreased as they relied on cooked foods and tools for cutting. D. Hominid hands developed smaller thumbs as they developed finer tools. Question 3 (Multiple Choice Worth 2 points) (04.05 MC)

[Answered] Over time, the number of organisms in a population increases exponentially. The table below shows the approximate number of organisms after [tex]$y$[/tex] years. | y years | number of organisms, [tex]$n$[/tex] | | :------ | :----------------------------- | | 1 | 55 | | 2 | 60 | | 3 | 67 | | 4 | 75 | The environment in which the organisms live can support at most 600 organisms. Assuming the trend continues, after how many years will the environment no longer be able to support the population? A. 12 B. 24 C. 81 D. 82

[Answered] In a food chain, what describes the number of levels an organism is away from the original source of energy? A. Food chain B. Autotroph C. Decomposer D. Trophic level

[Answered] Decomposition in pools, ponds, and lakes takes place mostly in the a. pelagic b. littoral c. benthic d. all of the above Please select the best answer from the choices provided.

[Answered] The carbon cycle ensures that carbon is not lost. Which is another important benefit of the carbon cycle? A. The carbon cycle helps regulate Earth's temperature. B. The carbon cycle ensures that living things have a continual source of hydrogen. C. The carbon cycle helps transport nutrients in bodies of water. D. The carbon cycle ensures that there is a continual supply of water.

[Answered] 1. Afferent impulses move: A. toward the brain B. away from the spinal cord C. away from the heart D. toward the peripheral nervous system

[Answered] In which of the following ways is photosystem I different than photosystem II? A. Photosystem I uses the high-energy electrons to reduce NADP to NADPH, whereas photosystem II uses them to produce ADP into ATP. B. Photosystem II contains a pigment complex to trap energy, whereas photosystem I does not. C. Photosystem II captures solar energy, whereas photosystem I does not.

[Answered] The pair of gene expressed in a heterozygous individual is called A. allele B. centrosome C. chromosome D. chromatid E. nucleus