When constructing a YAC, why must a large DNA insert be included?
A) The inserted DNA base pairs with DNA in the genome.
B) YACs that are too small do not segregate properly during mitosis.
C) The inserted DNA functions as telomeres.
D) The inserted DNA contains origins of replication needed for maintenance of the YAC.
E) The inserted DNA allows YACs to be used in both eukaryotic and prokaryotic cells.
B) YACs that are too small do not segregate properly during mitosis.
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What drives the flow of water through the xylem?
A) passive transport by the endodermis B) the number of companion cells in the phloem C) the evaporation of water from the leaves D) active transport by sieve-tube elements E) active transport by tracheid and vessel elements
The compound eyes of insects are very good at ________ but are less effective at ________
a. seeing in the dark / detecting movement b. generating clear images / depth perception c. detecting movement / generating clear images d. depth perception / seeing in the dark
Use the phylogenetic tree below to answer the following question(s).
According to this phylogenetic tree, which bear is most closely related to the American black bear?
A. The brown bear B. The Asiatic black bear C. The sun bear D. The polar bear
This arthropod is the vector for Lyme disease
a. spider b. tick c. wasp d. mosquito e. mites