Two intermediates of the sterol biosynthesis pathway, isopentenyl diphosphate and dimethylallyl diphosphate, are used by archaea in the biosynthesis of ________.
A. isoprenoids
B. hormones
C. diacylglycerol
D. nucleotides
Answer: A
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The tight packing of chromatin into the chromosomes visible during nuclear division is possible due to links between
____ proteins.
a. Cdk b. H1 histone c. H3 histone d. H4 histone e. nonhistone
Mutations can be
a. random. b. beneficial. c. harmful. d. heritable. e. all of these
Preimplantation genetic diagnosis is done:a
after in vitro fertilization on cells from the embryo. b. in the womb, before birth. c. after a woman is pregnant, but before the embryo implants. d. with the help of ultrasound. e. before fertilization on the sperm and the egg.
Which characteristic applies to a normal individual who is a carrier for an X-linked trait such as hemophilia?
A) The carrier is always female. B) The carrier is homozygous for the recessive condition. C) The carrier shows the recessive phenotype. D) The carrier cannot have daughters who have the allele.