Which amino acid is most soluble in water?
A. Glycine
B. Serine
C. Leucine
D. Valine
Answer: B
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Oxygen compounds toxic to pathogens include
A) hydrogen peroxide. B) hypochlorus acid. C) nitric oxide. D) hydrogen peroxide, hypochlorus acid, and nitric oxide.
The oldest fossils of eukaryotes have been estimated to be
A. 6000 years old. B. 8 billion years old. C. 4.5 billion years old. D. 1.5 billion years old. E. 1995 years old.
When the human genome was sequenced, we learned that there are fewer than expected protein coding genes
(approximately 20,000). Yet, the total number of proteins produced in humans approaches 100,000. What accounts for this discrepancy in numbers?
a. We have not yet identified all of the open reading frames in the human genome. b. We have not yet fully sequenced the human genome. c. mRNA processing mechanisms allowmultiple proteins to be produced from a single DNA sequence. d. Some noncoding DNA sequences encode proteins. e. There has been a gross over-estimation of the number of proteins produced in humans.
Cardiac muscle has prolonged contraction due to a sodium induced-calcium released process into the cytoplasm of the cell. Cardiac cells can communicate through pore-like channels between cells. List the junction and the organelle involved in cardiac muscle contraction?
A. gap; rough ER B. gap; smooth ER C. adherens; rough ER D. adherens; golgi apparatus E. adherens; smooth ER F. gap; golgi apparatus