Which of the following is not true with regard to compacting nucleic acids?
A. Some viral coat proteins are RNA-binding proteins that compact the RNA genome of the virus.
B. There are enzymes that introduce and maintain coiling of double-stranded DNA molecules.
C. There are DNA-binding proteins that maintain structural organization in eukaryotes.
D. There are DNA-binding proteins that maintain structural organization in bacteria.
E. Single-stranded RNA viruses compact their genomes by packaging complementary RNA.
E
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When is it believed that sponges evolved?
a. 3.2 billion years ago b. 1.2 billion years ago c. 870 million years ago d. 650 million years ago e. 420 million years ago
Effector cells
a. are fully differentiated lymphocytes. b. manufacture and secrete antibodies. c. can develop from either T or B cells. d. secrete antibodies or interleukins depending on their origin. e. include all of these descriptions.
Oxygen-rich blood flows through the heart
A) by entering the right atrium and continuing through the aortic arch. B) via the left atrium and ventricle before entering the systemic circuit. C) on the left side of the heart following returning from the lungs via the pulmonary arteries. D) right to left. E) only through the coronary arteries.
Daughter cells receive
What will be an ideal response?