Which of the following statements about DNA profiles is false?
1.Individuals vary in the length of certain DNA sequences called short tandem repeats located at many different chromosomal sites.
2.Each locus can have dozens of alleles of short tandem repeats (STRs).
3.In the U.S., DNA profiles utilize a standardized set of 13 STRs.
4.STRs are amplified by PCR before Southern blotting and visualization.
5.Due to environmental influences, STRs differ slightly between identical twins.
6.Even very old samples of DNA can yield sequences that are appropriate for DNA profiling.
5
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Space is not a limiting factor on a rocky intertidal beach
Indicate whether the statement is true or false
During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
A covalent bond occurs when
a. protons are transferred from one atom to another. b. neutrons are shared between two atoms to form an isotope. c. electrons are shared between two atoms to complete their octets. d. the hydrogen of one water molecule is attracted to the oxygen of another water molecule. e. electrons are transferred from one atom to another.
Which of the following is/are used during the fight-or-flight response?
A. Somatic neurons B. Parasympathetic nervous system C. Norepinephrine D. Sympathetic neurons and norepinephrine E. Parasympathetic neurons and norepinephrine