What compound is found at the reaction center of a photosystem?
A) chlorophyll b
B) carotenoids
C) phycobilins
D) chlorophyll a
D
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The Dunkers are a religious group that moved from Germany to Pennsylvania in the mid-1700s. They do not marry with members outside their own immediate community. Today, the Dunkers are genetically unique and differ in gene frequencies, at many loci, from
all other populations including those in their original homeland. Which of the following likely explains the genetic uniqueness of this population? A) population bottleneck and Hardy-Weinberg equilibrium B) heterozygote advantage and stabilizing selection C) sexual selection and inbreeding depression D) mutation and natural selection E) founder effect and genetic drift
How are species-area relationships traditionally plotted?
A. on a log-log plot. B. on a bar graph. C. based on a source pool. D. using a Shannon diversity index. E. None of these choices are correct.
Energy losses are multiplied in successive energy transfers in a food web
Indicate whether the statement is true or false.
The presence of which hormone in a mother's urine indicates that she is pregnant?
a. luteinizing hormone b. follicle-stimulating hormone c. human chorionic gonadotropin d. progesterone e. high estrogen