Mitochondria in eukaryotic cells contain ribosomes that are structurally similar to those found in prokaryotic cells.
a. true
b. false
Ans: a. true
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Why are nuclear localization sequences (NLS) not removed after nuclear proteins are transported to the nucleus?
A. It is too energetically costly for the cell. B. An NLS may be located almost anywhere along the primary sequence of the protein. C. mRNA molecules are synthesized in the nucleus. D. The nuclear envelope breaks down with each cell division.
Which of the following represents a density-independent cause for the extinction of wooly mammoths?
a. human hunting b. reduction of habitat c. climate change d. disease
The vitreous humor fills the main chamber of the eye. Which one of the following structures of the eye would vitreous humor come in direct contact with?
A) sclera B) cornea C) iris D) choroid E) retina
Which of the following nucleotide sequences could give rise to the amino acid sequence alanine-aspartic acid-glycine? Assume that translation initiation has already occurred.
A. CACCGCCGA B. GCCGACGGC C. GUUAAGAGG D. GAUGGUGCU E. UUUUAAUGG