Which organelles serve as the energy centers for most protists?
A. mitochondria and endoplasmic reticulum
B. mitochondria and plastids
C. mitochondria and nucleus
D. chloroplasts and Golgi bodies
Answer: B
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Some cytoskeletal elements are more permanent than others. Which components of the cytoskeleton are dynamic structures?
A. microtubules B. microfilaments C. intermediate filaments D. both microtubules and intermediate filaments E. both microtubules and microfilaments
What is the major limiting factor for benthic communities on continental shelves?
a. Food b. Space c. Substrate d. Light
You have constructed a genomic library of Felis catus (domestic cat) in E. coli. You extract the plasmid DNA from the clones, digest the plasmid with restriction enzymes, separate the resulting fragments by gel electrophoresis,
and transfer the fragments to a nylon membrane by the Southern blot procedure. You then use a fluorescently labeled probe that is complementary to a gene of interest that may be involved in feline lymphoma. The DNA corresponding to one clone yields a single fluorescent DNA band after probing the Southern blot. Based on this information A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the fluorescent DNA band. D) the part of the gene complementary to the probe is located on the fluorescent DNA band. E) only the one clone described contains the part of the gene complementary to the probe on the fluorescent DNA band.
You thinly slice a carrot root and place the slices on a medium containing nutrients and hormones necessary for plant growth. After a few weeks, you see that there are many little entire carrot plants growing from the root slices. The cells in the root can give rise to an entire plant because many plant cells are
A. totipotent. B. pluripotent. C. unipotent. D. embryonic. E. semipotent.