The hormone involved in childbirth that participates in a positive feedback loop is

a. estrogen.
b. progesterone.
c. somatostatin.
d. oxytocin.
e. vasopressin.


D

Biology & Microbiology

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Patterns of species change and succession are one focus of

A. behavioral ecology. B. environmental science. C. biological control. D. community ecology. E. physiological ecology.

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In humans, Cryptococcus grows as a ________.

A. mold B. yeast C. a mycelium D. dimorphic fungus

Biology & Microbiology

Three loci, mitochondrial malate dehydrogenase that forms a and b (MDHa, MDHb), glucouronidase that forms 1 and 2 (GUS1, GUS2), and a histone gene that forms + and - (H+, H-) are located on chromosome 7 in humans

Assume that the MDH locus is at position 35, GUS at position 45, and H at position 75. A female whose mother was homozygous for MDHa, GUS2, and H+ and whose father was homozygous for MDHb, GUS1, and H- produces a sample of 1000 egg cells. Give the genotypes and expected numbers of the various types of cells she would produce. Assume no chromosomal interference.

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What situation results when a population of spotted salamanders in an area of vernal pools remains stable for many years and was stabilized because of resource limits?

A) Density dependence is not involved. B) Predation has decreased. C) Carrying capacity has been reached. D) Density independence occurs.

Biology & Microbiology