Which of the following is not a potential mode of alternative splicing?
a. alternative 3? splice sites
b. alternative branch points
c. mutually exclusive exons
d. alternative 5? splice sites
e. exon inclusion/skipping
Ans: b
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During exhalation, the chest cavity ____ in size, which causes air pressure in the lungs to ____
a. increases; increase b. decreases; decrease c. increases; decrease d. decreases; increase e. expands, cause pressure
Amphibian and most reptiles have
a. a two-chambered heart with two blood flow circuits. b. a three-chambered heart with two blood flow circuits. c. a four-chambered heart with two blood flow circuits. d. a three-chambered heart with one blood flow circuit. e. a two-chambered heart with one blood flow circuit.
The only organ that can permanently rid the body of excess H+ is the ____
a. kidney b. lungs c. skin d. liver e. spleen
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.)
Fill in the blank(s) with the appropriate word(s).