Which body system is mainly affected by Creutzfeldt-Jakob disease?

A) Nervous system
B) Circulatory system
C) Respiratory system
D) Genitourinary system
E) Digestive system


A) Nervous system

Biology & Microbiology

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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.

Biology & Microbiology

Protists do not constitute a kingdom because they do not share a unique common ancestor

Indicate whether the statement is true or false.

Biology & Microbiology

IA and IB alleles exhibit ________ (complete or incomplete) dominance over the i allele

Fill in the blank(s) with correct word

Biology & Microbiology

A bacterial mutant is unable to initiate replication. In this mutant a replication bubble and replication forks never form. This suggests a mutation in the gene coding for___?

a. initiator proteins b. helicase c. primase d. DNA ligase

Biology & Microbiology