The difference between a pre-mRNA and a mature eukaryotic mRNA is __________
a. the 5' and 3' ends have been modified in mRNA
b. the removal of the leader sequence from the pre-mRNA
c. the fact that all introns have been spliced out in the mRNA
d. Both a and c
e. All of the above
Ans: d
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“Prebiotic soup” refers to ____
a. the interior contents of protocells b. the cytoplasm of early prokaryotic cells c. the mix of gases in the atmosphere that gave rise to the first organic molecules d. the polymerized slime coating ancient clay particles e. the accumulation of organic molecules that formed in the oceans before there was life on Earth
Which is a heart?
a) the structure that is the location for gas exchange b) the muscle that pumps blood through the circulatory system c) the organ that controls all of the other organs in the body d) the organ that breaks down food molecules to obtain energy
Which of the following statements is NOT correct about cnidarians?
A. Most are found in shallow coastal marine environments. B. A jellylike mesoglea separates the two tissue layers. C. The adult body is bilaterally symmetrical. D. Stinging cells contain a threadlike nematocyst released to capture prey. E. There are two tissue layers, an outer epidermis, and inner gastrodermis.
Viruses differ from cells in that viruses
A) are alive. B) contain DNA or RNA, but not both. C) only reproduce asexually. D) have more genes.