Which of the following processes is unique to the retroviral information flow within a cell?
A) RNA ? protein
B) protein ? DNA
C) RNA ? DNA
D) DNA ? RNA
E) protein ? RNA
C) RNA ? DNA
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Segmented genomes in negative-strand RNA viruses may include two to eight segments each coding for a unique protein.
Answer the following statement true (T) or false (F)
Steroid hormones can trigger gene expression in a select number of cells because ____
a. only target cells allow the steroid hormone to cross the plasma membrane b. nontarget cells have a steroid hormone response element encoded in their DNA c. only target cells have the correct receptor in their cytosol to bind to the hormone d. nontarget cells lack the genes found in target cells e. only target cells have the genes that steroid hormones activate
Woolly mammoths were determined to be more closely related to Asian elephants than to African elephants on the
basis of ____.
a. DNA sequencing of nuclear genes b. fossilized morphological evidence c. embryological evidence inferred from fossils d. mitochondrial and nuclear DNA sequences e. cytochrome c amino acid sequences
Because of a non-disjunction event occurring during meiosis, a particular egg has no X chromosome. This egg is fertilized by a normal Y carrying sperm. What is the genotype of the resulting zygote?
a) XXY b) YO c) XX d) XO