Generation time can be defined as the:
a. time required for a bacterial population to double.
b. time required for a bacterial population to triple.
c. time required for a bacterial population to quadruple.
d. half-life of bacteria.
A
Generation time is the time required for a bacterial population to double.
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In a newly fertilized egg, the vitelline layer _____
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter B) lifts away from the egg and hardens to form a fertilization envelope C) secretes hormones that enhance steroidogenesis by the ovary D) reduces the loss of water from the egg and prevents desiccation E) provides most of the nutrients used by the zygote
Allopatric speciation typically occurs in two stages. The first stage is ____ of two populations and the second stage is
____.
a. geographic separation; reproductive isolation b. natural selection; geographic separation
c. mutation; reproductive isolation d. reproductive isolation; geographic separation e. genetic drift; reproductive isolation
The substance that typically provides rigidity to fungal cell walls, and is also found in the external skeletons of insects
and other arthropods, is called ____.
a. lignin b. cellulose c. starch d. collagen e. chitin
What statement is an application of the first law of thermodynamics?
A. The level of entropy increases as time passes. B. Living organisms represent an exception to the laws of energy. C. The quantity of energy does not increase or decrease in the universe. D. Fungi and plants do not make their own energy but derive it from somewhere else. E. The amount of energy found in the compounds on one side of an equation is equal to that on the other side.