Which factor increases the likelihood of population extinction?
A. large population size
B. isolation of a population from density-independent effects
C. isolation of a population from sources of immigrants
D. high resource availability
E. high genetic diversity
C. isolation of a population from sources of immigrants
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The time between inoculation and the beginning of growth is usually called the
A) lag phase. B) log phase. C) dormant phase. D) death phase.
Which of the following statements is not true of the amino acids?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) All amino acids exist in two stereoisomeric forms. E) Amino acids have an N-terminus, C-terminus, and R groups.
The middle layer of membranes surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
The p53 gene is a tumor-suppressing gene that prevents damaged cells from undergoing cell division. If this gene ceases to function due to a mutation, what will happen to the cell?
A) Tumors will be suppressed. B) The cell will be prevented from undergoing division. C) The cell will die. D) Uncontrolled cell division will occur.