The animal in the above diagram has __________
a. an open circulatory system
b. no capillaries
c. a closed circulatory system
d. spaces in the tissues for blood to pool in
e. none of these
Answer: c
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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.
Use the following dataset to answer the following question.StateYearSales TaxSales per StoreEmployees per StoreIndiana20147.25$650,00050Illinois20147.75$625,00065Indiana20158.00$800,05075Illinois20158.75$525,00055What is the unit of observation?
A. State B. State-year C. Sales-employee per store D. Panel
What carries amino acids to ribosomes during translation?
a. mRNA b. tRNA c. DNA d. rRNA e. exons
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle)
Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four-chambered hearts of birds and mammals are best described as _____. A) structural homologies B) vestiges C) homoplasies D) the result of shared ancestry