Chromatin of eukaryotes is organized into repeating interactions with protein octamers called nucleosomes. Nucleosomes are composed of which class of molecules?
A) H1 histones
B) histones
C) lipids
D) glycoproteins
E) nonhistone chromosomal proteins
Answer: B
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Match the following items with the correct phrases.
_______1. The width of a typical coccus. _______2. The resolving power of the unaided eye. _______3. The resolving power of the scanning electron microscope. _______4. The resolving power of the transmission electron microscope. _______5. The resolving power of the compound light microscope. a. 0.2 nm b. 20 nm c. 0.2 ?m d. 1 ?m e. 0.2 mm
Frozen water is more dense than liquid water
Indicate whether the statement is true or false
Adaptive immunity is also referred to as ____ immunity
a. acquired b. active c. passive d. latent e. hidden
The concentration of oxygen is lower at high altitudes. Why would this make it harder for a person to get enough oxygen into their blood?
A. Hemoglobin cannot bind oxygen well at low concentrations. B. The concentration gradient from the alveoli to the blood decreases. C. People are working harder at high altitudes and have higher demands for oxygen. D. The concentration of oxygen in the blood is too low for diffusion into tissues. E. The heart cannot obtain enough energy to pump oxygen into the blood from the alveoli.