DNA replication is
A) conservative.
B) dispersive.
C) semiconservative.
D) irregular.
E) none of the above
C) semiconservative.
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Answer the following statements true (T) or false (F)
1. Cells can sense changes in the environment through alterations in the extracellular matrix. 2. Wrinkling observed with aging is due to increased production of the extracellular matrix molecule, collagen. 3. Blood vessels that can expand and contract contain a lot of collagen as a structural extracellular matrix protein. 4. Glycosaminoglycans and proteoglycans resist compression and are found in large abundance in joints of the body.
What is an invasive species?
a. a nonnative species that often outcompetes native species, leading to their extinction b. a native species that evolves a new trait and occupies more ecological niches c. a nonnative species that enriches the species diversity of a new ecosystem d. a nonnative species that often outcompetes native species, leading to evolution e. a nonnative species that eventually becomes extinct
The second law of thermodynamics states that ____
a. energy can be transformed into matter, and because of this, something is obtained for nothing b. energy can be destroyed during nuclear reactions such as those that occur inside the sun c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature d. energy tends to flow from concentrated to less concentrated forms e. energy tends to be stable over time
All humans are classified as Homo sapiens, a single species. But you know from looking around you that all people do not look or sound the same
Explain how it is possible for humans to belong to the same species yet display a wide range of physical differences.