Dragonflies that ranged in size from those smaller than today's dragonflies to some with wingspans of
75 centimeters (2.5 feet) appeared during the:a.
Cambrian period.
b. Ordovician period.
c. Silurian period.
d. Devonian period.
e. Carboniferous period.
E
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Answer the following statements true (T) or false (F)
1. In eukaryotes, most proteins contain short stretches of amino acid sequences called sorting signals which direct the protein to the correct cellular location. 2. The first step in cotranslational sorting occurs when the peptide is directed to the endoplasmic reticulum. 3. Chaperones keep proteins destined for the mitochondrial matrix in their three dimensional active structure. 4. Freeze fracture electron microscopy allows one to observe the two-dimensional cross section of membrane proteins.
The estimated number of pounds of fish or shellfish that a stock can yield in a year is called: a. gross yield
b. sustainable yield. c. net yield. d. potential yield.
In knockout experiments,
a. genes are removed from chromosomes. b. normal genes are replaced physically by mutated genes. c. wild type genes are mutated to prevent their transcription or translation. d. mRNAs are prevented from attaching to ribosomes. e. the protein products of specific genes are inactivated.
The most accurate description of an organism with genotype AaBb is
a. homozygous dominant. b. heterozygous. c. heterozygous dominant. d. homozygous recessive. e. heterozygous recessive.