Intermittent sterilization by non-pressurized moist heat is also called
A. boiling
B. Tyndallization
C. Pasteurization.
D. Denaturation
Ans: B. Tyndallization
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Lederberg and Tatum used the bacterial strains bio- met- leu+ thr+ thi+ and bio+ met+ leu- thr- thi- in their
experiments to determine if genetic recombination occurs in bacteria. Would it have been better to use two strains with the genotypes met- leu+ and met+ leu- instead?
a. Yes, because it is easier to study 2 genes than 5 genes. b. Yes, because the met- leu+ and met+ leu- strains only have one mutation, which makes it easier for genetic recombination to occur. c. No, because the met- leu+ and met+ leu- strains only have one mutation. A single random mutation could restore methionine or leucine synthesis in the strains. d. No, because strains with only one nutrient-deficient gene can still grow on minimal medium. e. No, because cells have two genes that encode different versions of leucine, so the met+ leu- strain would still be able to grow on minimal medium.
Four of the five answers are reasons that Africanized honeybees are more dangerous than European honeybees. Select the exception
a. Africanized honeybees have more potent venom. b. Africanized honeybees attack in larger numbers. c. Africanized honeybees sting with less provocation. d. Africanized honeybees pursue with more persistence. e. Africanized honeybees lack a high threat threshold.
The process of ________ has had a major impact on species distributions worldwide
A) continental drift B) comparative biochemistry C) genetic engineering D) divergent speciation E) adaptive mobility
Amphibians, birds, and mammals look the most similar as ______.
A. newborns B. embryos C. adults D. fossils E. juveniles