Label the circulatory system 1. identify the body areas or structures (letters)
vessels serving the head & upper limbs, vessels serving the lower limbs, vessels serving the abdominal cavity and intestines, capillaries of lungs

2. structures of the heart (numbers)
pulmonary trunk(artery), inferior vena cava, superior vena cava, pulmonary veins, aorta, abdominal aorta, right atrium, right ventricle, left atrium, left ventricle

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes.b) no; antibiotics do not kill viruses because viruses do not have dna or rna.c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.

Match the terms to their correct definitions. 1. commuting flexibility in when you work 2. telecommuting traveling to get to work 3. flextime a form of flexplace that allows people to use technology to do their work away from the office 4. flexplace flexibility in where you work