Diatoms have a special problem
A. because their + and - mating strains are nonmotile and have to be dispersed by currents
B. because their heavy siliceous shells impede conjugation
C. because they must await a chemical signal from a fish before they can become mobile and search for mating partners
D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller
E. because the gametes experience difficulty in exiting the overlapping halves of their siliceous shells
D. because their two halves fit like the lid and body of a pillbox and on repeated cell divisions the half that is overlapped gets progressively smaller
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Which of the following is true about the bacterium P. aeruginosa?
a. It contains many mitochondria because it actively divides. b. It has a cell wall. c. All its genetic material is contained in a circular plasmid. d. It is a eukaryote
The failure of chromosomes to separate during mitosis or meiosis is called
a. genetic displacement. b. trisomy. c. crossing over. d. nondisjunction. e. disjunction.
The brain stem consists of the midbrain, the pons and the _________ oblongata.
Fill in the blank(s) with the appropriate word(s)
The synthesis of a growing strand of DNA is carried out by adding nucleotides to which end of an existing strand?
A. 3' B. 1' C. 2' D. 5'