White muscles are designed to contract
a. quickly.
b. quickly and for short periods.
c. slowly.
d. slowly for short periods.
e. slowly for long periods.
B
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Why are genes associated with nitrogen fixation not typically used to identify bacteria species? (Select all correct choices.)
A. Their sequences are similar to those of rRNA genes. B. These genes are not typically exchanged between bacteria by horizontal gene transfer. C. These genes are often exchanged between bacteria by horizontal gene transfer. D. Every bacterium contains nitrogen fixation genes.
A heart murmur is caused by
A. a greater-than-normal force of contraction of the right atrium. B. a constriction of the pulmonary artery. C. blockage of the aorta. D. the heart valves not functioning properly. E. a greater-than-normal force of contraction of the left atrium.
Which embryonic tissue is incorrectly
associated with its derivative? a. skin; mesoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; ectoderm
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).