Which genus is best described as oxidase-positive, Gram-negative cocci that are normal flora of the respiratory and other mucosal surfaces and often form diplococci?

A. Neisseria
B. Chlamydia
C. Streptococcus
D. Staphylococcus


Ans: A. Neisseria

Biology & Microbiology

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Polydactyly is a dominant trait that results in extra fingers and toes in humans. A man with polydactyly marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. The phenotype of the man's father is unknown, but his mother has a normal phenotype. What are the genotypes of the married couple? (D = polydactyl allele; d = wild type allele)

A. woman Dd, man dd B. woman DD, man dd C. woman dd, man DD D. woman dd, man Dd E. woman DD, man Dd or dd

Biology & Microbiology

Darwin’s experiments on phototropism illustrated that

a. plant stems bend away from bright lights. b. signals from plant roots control phototropism. c. an opaque cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth. d. a translucent cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth. e. a translucent cap placed over a shoot tip will cause a plant to both grow and bend toward light.

Biology & Microbiology

Cancer-causing gene formed by a mutation in a proto-oncogene; codes for proteins that stimulate the cell cycle and inhibit apoptosis.

What will be an ideal response?

Biology & Microbiology

In multiplexing, the ___ of the STR and the color of the ___ are adjusted to give an optimal separation of multiple STRs.

What will be an ideal response?

Biology & Microbiology