The figure is a photomicrograph of
a. a nucleus.
b. a Golgi body.
c. endoplasmic reticulum.
d. a vacuole.
e. a nucleoid.
A
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Which of the following is NOT a factor that
has led to a dramatic increase in the human population?
a. increase in the carrying capacity b. increased reproductive life expectancy c. human invasion of new habitats and climatic zones d. a reversal from K-selected reproduction to r-selected reproduction e. the development of public health and the germ theory of diseases
From the relative positions of genes on the
chromosome illustration below, we expect a. the highest frequency of crossing over between genes A and D. b. more crossing over between C and D than between A and B. c. more crossing over between A and B than between B and C. d. the lowest frequency of crossing over between B and C. e. none of these.
How have classification systems for living things changed over the years?
A) Scientists have always recognized five kingdoms of living things, but the placement of species within those kingdoms has changed. B) Until the last 20 years, organisms had been classified first as animal or plant. Recently, a five-kingdom system became the preferred classification system. C) The three-domain system has been introduced within the last 30 years, to supplement the five-kingdom system. D) The exact organization proposed in the eighteenth century by Carl Linnaeus has recently been reinstituted by scientists.
Which of these hormones stimulates the production of milk?
A) Oxytocin B) Prolactin C) Estrogen D) Progesterone E) Colostrum