Answer the following questions true (T) or false (F)
1. Tiny holes that are channels between animal cells are called gap junctions.
2. The hydrophilic region of the phospholipid bilayer faces to the interior of the plasma membrane.
3. In cystic fibrosis, cells cannot pump out enough chloride ions.
1. TRUE
2. FALSE
3. TRUE
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cAMP activates
A) protein kinase A. B) protein kinase B. C) protein kinase C. D) protein kinase G. E) MAPK.
Which of the following is not important in getting oxygen from the alveoli into the capillaries?
A. The difference in oxygen concentration in the blood compared to the alveoli B. The number of alveoli and capillaries present C. The thickness of the capillary-alveolus wall D. The number of nitrogen molecules present in the lungs
Mosses grow on the branches of some plants. The moss is benefited but the other plant is neither helped nor harmed. This is an example of what type of symbiosis?
a) mutualism b) parasitism c) predation d) commensalism
If a parent cell has 16 chromosomes, how many sister chromatids will be present after duplication of the chromosomes?
A) 16 B) 64 C) 4 D) 8 E) 32