A patient with Bruton's agammaglobulinemia has decreased immunoglobulin. This disease affects __________.
A) Macrophages
B) natural killer cells
C) T cytotoxic cells
D) B cells
Ans: D) B cells
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Key sequences exist within promoters, which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position. These representations are called ________ sequences.
A. convergence B. consensus C. idealized D. common
The ability of some tRNAs to pair with different codons is described according to ____ as being due to
imprecise base pairing with the third base in the codon.
a. alternative splicing b. degeneracy c. exon shuffling d. the wobble hypothesis e. aminoacylation
An analysis of plasma or nuclear membrane
would yield
a. cellulose and chitin. b. suberin and cutin. c. phospholipids and proteins. d. microtubules and microfilaments. e. phospholipids and nucleic acids.
Embryo splitting is a type of cloning in which an egg is fertilized in vitro and
A) then the genomic DNA is replaced with that from a desired donor. B) allowed to reach the fetus stage before implanted into the designated mother. C) then following mitosis, the intact nuclei are transferred to somatic cells for embryo development. D) the cells are split after the eight-cell stage to be implanted into a surrogate mother. E) subjected to nuclear transfer.