Mae is an airline hostess who has difficulty sleeping at hotels overseas because of the time change. Ingestion of what kind of pill might best help her sleep?
A. Oxytocin.
B. Prolactin.
C. Melatonin.
D. Melanocyte-stimulating hormone.
E. Thyroid-stimulating hormone.
Children born to alcoholics exhibit abnormal nervous systems. In studying the effects of alcohol on embryonic development of the nervous system, what tissues might an embryologist best begin to investigate?
A. Primitive streak.
B. Somites.
C. Neural folds.
D. Notochord.
E. Trophoblast.
Andrea plans to study the cause of human muscle development defects that may be induced by environmental pollutants affecting human embryos. She might best test the effects of pollutants on cells from what source?
A. Primitive streak.
B. Trophoblast.
C. Neural folds.
D. Notochord.
E. Somites.
Darren is a wildlife technician who is sampling specimens from a deer to determine reproductive condition. Which cells might be expected to divide by meiosis?
A. Spermatids.
B. Spermatozoa.
C. Spermatocytes.
D. Spermatogonia.
Sequence the following in the pathway from egg production to giving birth: (1) vagina, (2) oviduct, (3) cervix, (4) ovary.
A. 1>2>3>4.
B. 4>3>2>1
C. 3>2>4>1
D. 4>2>3>1
E. 2>1>4>3
The global human population is 6.4 billion. The birth rate is 21 per thousand per year, the death rate is 9 per thousand per year, and the fertility rate is 2.8 children per woman’s lifetime. What is the growth rate of the world population?
A. 6.4
B. 2.8
C. 1.2
D. 1.0
E. 2.1
Shane is studying a deer population with a birth rate of 400 per thousand per year and a death rate of 100 per thousand per year. What is the annual growth rate of the deer population, ignoring immigration and emigration?
A. 40 percent.
B. Five percent.
C. 20 percent.
D. 10 percent.
E. 30 percent.
Bart is studying population changes in antelope. Which of the following statistics would be the best indicator of population change?
A. Birth rate.
B. Death rate.
C. Difference between fertility rate and death rate.
D. Fertility rate.
E. Difference between birth rate and death rate.
Belle is studying a population of moose on an island and the shape of the population growth curve is sigmoid, with population size plotted on the vertical axis and time plotted on the horizontal axis. Likely what accounts for the flattening of the curve at the top?
A. Density suddenly lowered.
B. Allelopathy.
C. Aging of animals so they no longer reproduce.
D. Shortage of resources, raising the death rate and lowering the birth rate.
E. Exponential growth.
If you wished to make a documentary film comparing American antelope to African antelope, which biomes would you target for filming?
A. Taiga - desert.
B. Desert - savanna.
C. Tundra - tropical rain forest.
D. Savanna - temperate grassland.
E. Temperate deciduous forest - savanna.
If you wished to evaluate global exploitation of coniferous trees, which biome would you focus on?
A. Temperate deciduous forest.
B. Savanna.
C. Taiga.
D. Tundra.
E. Tropical rain forest.
Which of the following is not characteristic of both desert and tundra?
A. Few or no trees.
B. Low precipitation.
C. Plants have access to water only periodically.
D. Usually occur far from the sea.
E. Short growing seasons.
Brenda is studying burrowing animal distribution. Which ecosystem would be least likely to support species that burrow deep into the ground?
A. Desert.
B. Alpine tundra.
C. Grassland.
D. Arctic tundra.
E. Savanna.
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