Answer the question using the accompanying figure. Which branch of this phylogenetic tree identifies the common
ancestor of all modern organisms?
a. A
b. B
c. C
d. D
e. E
ANSWER: a
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In gene regulation and control, repression is defined as the:
a. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. b. mechanism of genetic control in which genes are induced only when the substrate to be degraded by enzymatic action is present. c. change of the bacterial genotypes through the exchange of DNA from one cell to another. d. mechanism of genetic control in which genes are not transcribed and therefore are not expressed in the presence of those target products in sufficient supply.
Select the phrases that can be associated with intersexual selection
A. peahens choosing peacocks with greater number of eyespots in their tail feathers B. males fighting males to win a territory C. mate choice D. sexual selection within a sex
Which of the following contribute to the successful application of Koch's postulates?
A) The development of the compound microscope. B) The theory of abiogenesis. C) The ability to record the appearance of bacteria photographically. D) The development of simple bacterial staining techniques. E) The development of techniques for sterile transfer of bacteria.
Reactions that are both catabolic and anabolic are amphibolic
Indicate whether the statement is true or false