Each HIV particle possesses a ___________ on its surface, called gp120, that precisely binds to a protein, called CD4, that is found on the surfaces of the immune system cells called macrophages and T cells.
A. nucleic acid
B. phospholipid
C. polysaccharide
D. glycolipid
E. glycoprotein
E. glycoprotein
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Bacteremia is a term used
A) to indicate the presence of bacteria in the blood. B) synonymously with septicemia. C) when the same organism is isolated from more than one site. D) to indicate the presence of bacteria in the lungs.
A small evolutionary shift in the size of the bill of a finch species is an example of ____
a. macroevolution b. sexual selection c. mutation d. microevolution e. orthogenesis
In sponges, spicules are secreted by amoeboid cells
____________________ Indicate whether the statement is true or false.
Which of these would be considered a cis-regulatory element for a gene?
A. Methylation of DNA preventing transcription B. A region of DNA sequence upstream of a gene where transcription factors bind C. A DNA binding protein that functions to repress transcription D. A protein that binds to an enhancer to activate gene expression E. a ribosome that translates a mRNA sequence to produce a transcription factor