The subunits of proteins are ________
a. monosaccharides
b. nucleotides
c. amino acids
d. fatty acids
c
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Knockout mice have been genetically altered to knock out specific genes. How are these mice most often used in research?
A) to study DNA replication in the defective genes (those that have been altered) B) to determine the role of proteins coded for by those genes that are knocked out C) to examine defects in DNA structure in those regions that have been altered D) to study the effect of radiation on DNA
The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called ________.
A. ribozymes B. ribosomal RNA C. transfer RNA D. messenger RNA E. primer RNA
Four of these statements are true about mitochondria. Which one is not true?
a. They have DNA. b. Their DNA can experience mutations. c. In animals, the mitochondria come from the mother. d. They undergo genetic recombination during fertilization. e. Their DNA can be used as molecular clock.
The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing is the
A) Log phase B) Death phase C) Lag phase D) Stationary phase E) Prophase