A mutagen has introduced a frame-shift mutation by adding one nucleotide base. Which of the following could be a reversion mutation for this particular mutant?
A) deleting 2 bases only
B) adding 1 base only
C) deleting 1 base or adding 1 base
D) deleting 1 base or adding 3 bases
E) deleting 1 base or adding 2 bases
E
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Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilaginous skeletons. How are they different from lampreys?
A. They have closed circulatory systems. B. They have gills. C. They have jaws. D. They have bony fin lobes. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the evolution of the jaw? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Both gram-positive and gram-negative cells have outer membranes.
Answer the following statement true (T) or false (F)
Splicing of mRNA ____
a. takes place in the nucleus
b. involves removing the nucleotide cap c. involves removing exons leaving behind introns d. occurs prior to transcription e. occurs after translation
________ refers to a structure of a protein in which two or more polypeptide chains bind together to form a functional protein
Fill in the blank(s) with correct word