Which of the following could possibly account for an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body.
B. Hox genes duplicated once during animal evolution.
C. Duplication of Hox genes and duplication of Hox gene clusters throughout animal evolution.
D. Inversion of Hox genes about 600 million years ago.
E. The creation of Hox gene clusters through inversion and uncontrolled replication.
C. Duplication of Hox genes and duplication of Hox gene clusters throughout animal evolution.
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You are excited because your lab is studying the first microorganisms retrieved from Mars! Interestingly, their genetic material consists of a single-stranded nucleic acid with six different nitrogenous bases. Like organisms from Earth, segments of the nucleic acid contain the code for making proteins. If the genetic code in these organisms was read in groups of 2 bases instead of 3, what is the maximum number of amino acids that could be coded for assuming that only one codon functioned as a stop codon? (Enter your answer as a numeral not a word, e.g. enter 17 not seventeen.)
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the genetic code? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
An antigen must be at least ________ amino acids long to be effective in a vaccine
A) 10 B) 25 C) 50 D) 100
Genetic recombination as a result of crossing over
occurs more readily in genes a. that are on the sex chromosomes. b. that are on the autosomes. c. that are located close together on the same chromosome. d. that are located far apart on the same chromosome. e. that are located on different chromosomes.
Which of the following domains are the MOST closely related, in that they share a unique common ancestor?
a. Archaea and Bacteria b. Bacteria and Eukarya c. Archaea and Eukarya