Encapsulated yeast is identified in the cerebrospinal fluid (CSF) of a patient with AIDS. The most likely stain or reagent used to identify this organism is:
a. potassium hydroxide (KOH).
b. calcofluor white.
c. lactophenol cotton blue.
d. India ink.
D
Traditionally, the India ink preparation has been the most widely used method for the rapid de-tection of C. neoformans in clinical specimens. This method delineates the large capsule of C. neoformans, because the ink particles cannot penetrate the capsular polysaccharide material.
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Which sequence of events is most CORRECT for the initiation and elongation steps of translation?
(1) initiator tRNA binds start codon on mRNA (2) small ribosomal subunit binds to mRNA (3) large ribosomal subunit binds (4) tRNA entry and peptidyl transfer reaction (5) translocation of ribosome and release of tRNA A. 1, 2, 3, 4, 5 B. 1, 2, 3, 5, 4 C. 1, 3, 2, 4, 5 D. 2, 3, 1, 5, 4 E. 2, 1, 3, 4, 5
In female mammals, most of the inactive X chromosome has become:a
associated with histones. b. active X factor. c. euchromatin. d. replicated. e. heterochromatin.
True or false? Humans contain more genes in their genome than any other species on Earth
Indicate whether the statement is true or false
Double strand breaks are generally readily repaired.
a. true b. false