Respiratory surfaces in all vertebrates have
A. moist epithelia.
B. large surface areas.
C. thin epithelia.
D. a very high degree of vascularization.
E. All of the answers for this question are correct.
E. All of the answers for this question are correct.
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Clara has alkaptonuria. Her symptoms include back spasms, dark urine, arthritis, hearing loss, kidney stones, heart valve damage, and darkened ear tips. This condition is therefore
A) genetically heterogenic. B) pleiotropic. C) dominant. D) epistatic.
Who demonstrated the possibility of producing
organic compounds from gases and water if the mixture is exposed to energy? a. Stanley Miller b. Thomas Brock c. Australian researchers d. Jeon Kwang e. Lynn Margulis
All of the following statements describe methods to scan the body for cancer except for one. Select the method that is mismatched.
A. Diagnostic mammograms are detailed scans that look at specific areas of the breast, often after a suspicious lump is found. B. Computerized tomography (CT) scans use radio waves and magnets to obtain a detailed picture of organs within the body. C. Positron Emission Tomography (PET) scans function to examine how cells of the body function. Sugars with a radioactive tracer are introduced to the body. Active cells take up more of the sugar and are therefore more visible on the scan. D. Screening mammograms are routine X-rays of breast tissue for anyone over the age of 40 or those with a previous history of breast cancer.
Chronic inflammation caused by infectious agents can increase the chance of cancer because immune cells fighting the infection
A) induce conversion of the RAS proto-oncogene to the oncogene in neighboring cells. B) secrete metalloproteinases that digest holes in the surrounding extracellular matrix. C) secrete phorbol esters. D) secrete an oncogenic form of a growth factor. E) produce mutagenic oxygen-free radicals.