Organisms that live optimally in cold temperatures are called barophiles
Indicate whether the statement is true or false.
ANS: F, psychrophiles
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Which of the following is important in microscopy?
a. magnification b. lens length c. base height d. number of adjustment knobs
To map genes of a bacterial strain, conjugation must be interrupted at given times
Suppose you have Hfr cells of genotype a+b+c+d+e+strR and F– cells of genotype a–b–c–d–e–strS and you combine these two cultures in liquid medium in four blenders at time 0. After intervals of 3, 6, 9, and 12 minutes, you turn on successive blenders. What role does the blender play in the experiment? A) serves as a culture container only B) acts as a mechanism to bring cells into contact C) speeds up molecular movement of DNA D) shears the sex pili of conjugants E) hastens conjugation events
An Hfr cell and an F? cell result from conjugation between a donor cell and a recipient cell. Which statement is false regarding this event?
A. The donor could not have been F?. B. The donor could have been either F? or F+. C. The recipient could have been F?. D. The donor could have been Hfr.
A special strain of which organism is used to make Roquefort or bleu cheese?
A) Saccharomyces cerevisiae B) Leuconostoc mesenteroides C) Streptococcus lactis and Lactobacillus D) Penicillium E) Spirulina