Answer the following statements true (T) or false (F)
1) Cytokinesis in plant cells occurs by means of a cleavage furrow.
2) DNA replication occurs in mitosis.
3) Mitosis and cytoplasmic division result in the formation of two genetically identical cells.
4) Germ-line cells are haploid but gametes are diploid.
5) At the end of meiosis I, each daughter cell contains the sister chromatids from only one chromosome from each chromosomal pair.
6) XY individual with a loss-of-function mutation in the SRY gene is expected to be female.
1) FALSE
2) TRUE
3) TRUE
4) FALSE
5) TRUE
6) TRUE
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Target tissues for steroid hormones and thyroid hormones do not have membrane receptors for these
hormones because they
a. stimulate the cell by changes in electrical activity. b. are water soluble. c. enter the cell by ion channels. d. are small enough to diffuse directly into the cell. e. are soluble in the lipid bilayer.
The upper, unconfined portion of the groundwater constitutes the ____, which flows into streams and is partly accessible to plants.
A. aquifer B. hydrozone C. water table D. watershed
Which of the following does not contain a gastrovascular cavity?
a. hydras b. cnidarians
c. sponges d. flatworms e. jellyfish
During the initiation of nitrogen-fixation nodules, the Rhizobium bacteria release what type of molecules to signal the host plant?
A. Nod factors B. flavonoids C. sugars D. transcription factors E. proteins