Histone proteins
A) are male sex hormones.
B) are inert spool-like structural supports around which DNA winds.
C) control gene expression through chemical interactions that expose parts of the DNA to transcription factors, while shielding other parts.
D) bind to mRNAs, preventing their translation into protein.
C) control gene expression through chemical interactions that expose parts of the DNA to transcription factors, while shielding other parts.
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Organisms that obtain their energy from producers or other consumers are
A. heterotrophs. B. autotrophs and producers. C. producers. D. heterotrophs and producers. E. autotrophs.
DNA coding regions that affect the same trait are called
a. homologues. b. alleles. c. autosomes. d. loci. e. gametes.
The Human Immunodeficiency Virus (HIV) only affects a specific class of cells in the immune system called T helper cells, and not other types of T cells. Which is the best explanation for this observation?
a. HIV can only replicate inside of T helper cells b. Only T helper cells have reverse transcriptase c. The T helper cells are not necessary for the immune system to fight viral infections d. Only T helper cells have the correct receptor on their cell surface e. HIV can only be released from T helper cells
As more is learned about cancer, it has become clear that cancer, with few exceptions, has no genetic basis
Indicate whether the statement is true or false