The accommodation of the very long DNA strands that are part of a chromosome into the limited space of the nucleus is achieved by coiling the DNA around beads of histones into repeating subunits. These DNA-wrapped histones are called:
A. Solenoids
B. Nucleosomes
C. Chromatin loops
D. Rosettes
B. Nucleosomes
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Four of the five answers listed below are targets of the immune system. Select the exception
a. virus b. normal cells c. cancer cells d. bacteria e. debris and dead cells
The process of biological evolution often allows humans to survive consistent environmental stresses that occur across multiple generations. As humans colonized Earth's diverse environments, they encountered hot, dry areas and decided to settle
What trait likely offered an advantage in this environment? A) the ability to produce sweat to cool their bodies B) the ability to shiver to create body heat C) the ability to squint eyes to block out bright light D) the ability to dig deep holes to find groundwater
The three-base sequences on mRNA that code for a particular amino acid are called ___________
Fill in the blank(s) with the appropriate word(s).
Patient X has 150 CD4 T cells/mm3. What phase of an HIV infection is this patient in?
A. terminal phase (E) B. transmission phase (D) C. acute phase (A) D. chronic phase (B) E. AIDS (C)