A Gram-positive psychrotrophic rod ________ is a frequent contaminant of dairy products and meat and survives phagocytosis.
A. Escherichia coli
B. Mycobacterium leprae
C. Clostridium perfringens
D. Bacillus thuringiensis
E. Listeria monocytogenes
Answer: E
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Membrane-enclosed organelles, such as nuclei, lysosomes, endoplasmic reticulum, mitochondria, and chloroplasts,
A) form specialized compartments within eukaryotic cells for specific functions to occur. B) increase the structural complexity of eukaryotic cells. C) help large eukaryotic cells overcome the limitations of diffusion imposed by their large cell size. D) increase structural complexity, help eukaryotes overcome diffusion limitation due to their size, and form specialized environments for specific functions to occur.
Southern blot is a method for ____
a. amplifying DNA segments using cycles of denaturation, annealing to primers, and DNA polymerase-directed DNA synthesis b. transferring DNA fragments from a gel to a membrane filter and used in hybridization experiments c. determining the nucleotide sequence of a DNA molecule d. producing several clones from a single cell by placing the cell in a Petri dish and allowing it to go through several divisions e. detecting mutant genes or differences in the pattern of gene expression
What major concept of DNA did Watson and Crick design in their DNA model?
(A) DNA was a double helix (B) DNA was the hereditary molecule (C) DNA copies itself through semiconservative replication (D) Amino acid may have been the first biological molecules formed on earth
A(n) ____ is a dicot.
A. spruce B. moss C. lily D. apple tree