Exam 1 key

E none of the above 8 The scientific method usually begins with: A formulating a testable hypothesis B making careful observations ANSWER C formulating a theory E conducting a controlled experiment 9 Darwin's confirmation of evolution was supported by which of the following: A His ability to artificially select for particular phenotypes of pigeons and plants.

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Shape varies from sharp for shearing flesh to broad, cusped surface for smashing and grinding Molars Similar to premolars in shape tearing, smashing grinding 4.

The family Peramelidae bandicoots has a chorioallantoic placenta. The rest of the marsupials have a choriovitelline placenta. The choriovitelline placenta is less vascularized than the chorioallanoic placenta.

The portion in contact with the uterine lining is convoluted to increase the surface area in contact with the uterus but it is not deeply imbedded in the uterine lining. A small amount of material uterine milk diffuses from the uterine tissue to the fetus, but most of the nourishment for the fetus comes from the yolk sac.

The chorioallantoic placenta is more highly vascularized. The fetal and maternal tissues are more highly interconnected due to the many finger-like projections villi that grow into the uterine lining. Gases and nutrients diffuse from the maternal capillary beds, across the placental membranes and into the fetal capillaries, and vice versa.

This answer could also have been diagrammed in part. One type of mammary gland consists of glandular tissue that produces milkmilk ducts in which the milk collects and a nipple an external protrusion that the infant sucks on to obtain milk.

Exam 1 key

The other major type consists of glandular tissue, a cistern large compartment for collecting and storing milk and a teat the external projection that is suckled by the infant.

Monotremes have no nipples or teats, but instead secrete milk on to the fur or skin, where it is lapped up by the infants. This increases the efficiency of gas exchange in the lungs. The evaporation of sweat helps to cool the body when environmental temperatures are high.

This keeps the hairs from becoming brittle and increases their ability to insulate the body against heat loss. In semi-aquatic animals, sebaceous gland secretions also waterproof the hair, which keeps water from contacting the skin. This would be a major loss of heat.

The opposable, clawless hallux and long digits enable the didelphid marsupial to grasp branches. The macropod food shows syndactyly loss and fusion of digitswith the 4th digit serving as the main base of support. This allows a strong pulpulsive force for saltatory locomotion.

The reduced 3rd and 5th toes may serve to stabilize the foot. The dasyurid shown is terrestrial and shows an elongated foot with fairly short digits. There is no evidence of syndactyly. This is an unspecialized foot for generalized terrestrial locomotion this particular example is a hopping animal, but the foot shape is also typical of plantigrade terrestrial locomotion.

FYI, I gave credit to everyone who made a reasonable attempt to explain the significance of foot shape in the dasyurid. Characteristics of therapsids that we think of as typically mammalian could include:Answer Key to the Short Answer Section Exam 1 Spring 1.

Marsupials are extremely undeveloped at birth: incomplete separation of the ventricles of the heart. View Test Prep - Exam 1 a key(2) from MGMT at Purdue University.

ANSWER KEY Part I: Gantt Chart (10 points - 2 per question) Answer questions 1 5 based on the following Gantt chart.

Assume the. CHM Exam 1 - Chapters 1, 2, 5, and 6 Show all work and clearly mark answers to receive credit! 1) (5 pts) Circle the elements below that are noble gases.

CS FS Exam 1 Key This is a closed-book, closed-notes exam.

Exam 1 key

The only items you are allowed to use are writing implements. Mark each sheet. Practice for Exam #1 – Answer Key Use the following diagram of homeostasis of water content of the body to answer questions 6) The homeostatic system that the body uses to control water content of the body is a positive feedback system.

a) True b) False. Study 58 Exam 1 key flashcards from Annie W. on StudyBlue. 23) If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells? A) The cells swell and burst because water moves into the cells.

B) The cells shrivel up because water leaves the cells.

Exam 1 Answer Key