A group of neighboring populations that exchange individuals is defined as a ____
a. metapopulation
b. megapopulation
c. community
d. source population
e. sink population
A
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Matching I. Choose the one most appropriate answer
for each. 1. ___ companion cells 2. ___ cork cambium 3. ___ meristems 4. ___ palisade mesophyll 5. ___ pericycle 6. ___ sclereids 7. ___ sieve elements 8. ___ spongy mesophyll 9. ___ tracheids 10. ___ vascular bundles 11. ___ vessel members A. gives rise to periderm B. nucleate phloem cells that help load and unload the phloem C. dead cells with perforation plates; more efficient at water conduction than other xylem cells D. living nonnucleated cells that conduct food from photosynthetic source area to storage sink area E. a cylinder of parenchyma cells outside the vascular tissue but inside the endodermis F. clusters of strands containing xylem, phloem, and vascular cambium G. dead cells without perforation plates; the principal xylem cells of nonflowering vascular plants H. cells with thick secondary walls impregnated with lignin that are especially abundant in fruits and seeds I. the principal photosynthetic region of a leaf J. regions that can undergo mitosis K. gas exchange and storage plus photosynthesis
The symptoms of alkaptonuria result from a build-up of ____________________ in the blood. Fill in the blank(s) with the appropriate word(s)
The stages of labor, in order, include
A) dilation, contraction, and afterbirth. B) contraction, dilation, and afterbirth. C) dilation, contraction, and expulsion. D) dilation, expulsion, and afterbirth. E) amniotic rupture, contraction, and expulsion.
An alteration occurs during the formation of a dikaryotic cell, such that it has twice the number of nuclei compared to a normal dikaryotic cell. Only the number of nuclei changes; the type of nuclei remains the same. This altered cell is most accurately described as having
A. four diploid nuclei B. two haploid nuclei. C. has four haploid nuclei. D. two haploid nuclei and two diploid nuclei. E. two diploid nuclei.