The physical location in the environment to which an organism has adapted is its ________.
A. community
B. habitat
C. biome
D. population
E. niche
Answer: B
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The molecule(s) that act as molecular glue to bind DNA fragments together is/are
A. DNAse. B. DNA ligase. C. ligandase. D. polymerase. E. DNAse AND ligandase.
In most plants stomata are ____
a. open during the night and closed during the day b. nearly always open c. closed only when guard cells are not exposed to sunlight d. almost never open e. open during the day and closed during the night
Prenatal diagnosis techniques such as amniocentesis and chorionic villus sampling remove cells that
were produced by an embryo. These cells are then used
a. to treat diseases. b. for implantation to produce pregnancy. c. to develop embryonic stem cells. d. to test for the presence of mutant alleles or chromosomal alterations. e. for cloning.
Which of the following is the best description of the form of an exoskeleton?
a. spines extending from the surface b. plates under the skin c. hollow, rigid tubes d. interior columns e. fluid-filled bags