Exam 3 Biol106 Spring 2005

(1) The time it takes for a gas like oxygen over a distance of 1 millimeter is:

(a) 100 seconds

(2) When organisms get larger than 1 millimeter, to be able to take up sufficient oxygen across their external surface they need to:

(c) increase their surface area

(3) When carbon dioxide is produced this results in:

(b) decreased pH

(4) Organisms like humans sense reduced oxygen by monitoring:

(c) decreased pH in the bloodstream

(5) Collagen is:

(c) a protein fiber that forms a triple helix

(6) In counter current exchange in the fish gill:

(c) blood moves in the opposite direction as water

(7) If blood in the fish gill moves in the same direction as water (that is 100% air saturated):

(b) maximum oxygen concentration in blood exiting the fish gill will be 50% air saturation.

(8) After the blood leaves the fish gill, it goes to the:

(c) systemic capillaries

(9) What are the small structures on fish gills that contain capillary beds?

(a) lamellae

(10) Air enters the insect tracheal system via:

(b) spiracles

(11) Insects have:

(c) an open circulatory system

(12) Human lung systems are inefficient because:

(d) tidal ventilation in the lung does not allow complete exchange with each breathing cycle

(13) The pathway of blood in amphibians is:

(c) right atrium --> ventricle --> lung and skin capillaries --> left atrium --> ventricle --> systemic capillaries --> right atrium

(14) Crocodiles have:

(d) 4 chambered hearts

(15) Which of the following is a characteristic of veins

(c) have valves to prevent backflow of blood

(16) The human digestive system is an example of:

(b) alimentary canal

(17) The human stomach contains the following enzymes:

(a) pepsin

(18) Most of the nutrient absorption in the human digestive system takes place in:

(c) the small intestine

(19) Procarboxypeptidase, trypsinogen, and chymotrypsinogen are produced by the:

(c) pancreas

(20) Procarboxypeptidase, trypsinogen, and chymotrypsinogen are:

(c) inactive protease precursors

(21) Which of the following mixtures in water will digest protein:

(b) Trypsin, chymotrypsin, carboxypeptidase

(22) The large intestine is:

(a) filled with symbiotic bacteria

(23) Based on what you know about bacteria in the gut of animals:

(b) the type of bacteria present in an animal can be very specific and can perform specific digestive functions

(24) The cecum:

(b) is very large in some herbivores

(25) Pheromones:

(b) are small volatile signals that function in communication between animals

(26) The sequence of action of a steriod hormone is as follows:

(c) diffusion across membrane, binding to receptor, regulation of gene expression

(27) Many hormones are derived from:

(a) amino acids

(28) This enzyme is only produced by bacteria and protists:

(c) cellulase

(29) Large surface area:

(a) Helps to increase gas exchange

(30) Large animals are more likely to have:

(a) Gas exchange via gills and lungs instead of body surface

(31) If an organismís Q10 value for respiration is 2, and its respiration rate at 25°C is 1 unit O2 per minute:

(c) at 35°C, the respiration rate will be 2 units O2 per minute

(32) Which of the following is a characteristic of an ectotherm?

(a) body temperature the same as the environment

(33) Which of the following could be used to increase internal body temperature in a cold environment:

(a) behavioral thermoregulation

(34) Which of the following helps animals to tolerate cold temperatures:

(b) an increased proportion of unsaturated fatty acids in their membranes 

(35) The animal above is in the phylum:

(a) chordata

(36) Sea urchins and starfish are:

(c) echinoderms

(37) Platyhelminthes flatworms do not have:

a. a coelom

(38) Cnidarians include:

c. sea anemones

(39) Annelids have:

a. a closed circulatory system

(40) Hermaphrodites:

a. have both male and female sex organs 

(41) The structures above are found in:

c. human lungs

(42) The organ above is:

c. the small intestine

(43) increased surface area:

b. increases gas exchange

(44) Follicle stimulating hormone is involved in:

b. reproduction

(45) Heterotrophs

b. cannot synthesize their own food

(46) The muscular chambers of the heart that force blood into the lungs or systemic blood vessels are called:

b. ventricles

(47) Normal collagen melts at around:

a. 58 degrees C

(48) Small (<1 cm) organisms:

a. can use their body surface for most gas exchange

(49) The tidal volume in human breathing is:

b. 500 ml

(50) Nematodes have:

b. a pseudo coelom

(51) You have exam version A. Pls mark ìAî on your answer sheet.