Which statement correctly describes archaeal cell walls?
A. Many have peptidoglycan.
B. Some have an outer layer of complex polysaccharide.
C. Some have an outer layer of protein.
D. Some have an outer layer of complex polysaccharide and some have an outer layer of protein.
Answer: D
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Your brother has just purchased a new plastic model airplane. He places all the parts on the table in approximately the positions in which they will be located when the model is complete. His actions are analogous to which process in development?
A) morphogenesis B) determination C) induction D) differentiation E) pattern formation
There are several reasons bacterial groupings based on morphology, physiology, and other metabolic characteristics may not be supported by molecular phylogenies produced from rRNA genes
Consider the statements below as possible reasons for this discrepancy. Obtaining the traditional groupings of bacteria requires sequencing and comparing the entire genome of each organism and cannot rely on single gene phylogenies generated from 16S rRNA datasets. A. true B. false
Approximately half of known animal carcinogens can be detected by the Ames test.
Answer the following statement true (T) or false (F)
Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early twentieth century?
A) Individuals inherit particular chromosomes attached to genes. B) Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis. C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. D) No more than a single pair of chromosomes can be found in a healthy normal cell. E) Natural selection acts on certain chromosome arrays rather than on genes.