If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of
a. 23 chromatids.
b. 23 chromosomes
c. 92 chromosomes
d. 46 chromosomes
Ans: c. 92 chromosomes
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How can two cells of a complex multicellular organism have the same genome, but markedly different structures and functions?
A. During differentiation, as cells become specialized, they lose portions of their genome that are no longer needed. B. Different genes are expressed in different cells. C. Part of the process of differentiation of cells involves mutations in the genome. D. Once differentiation begins, the genome no longer controls cellular functions.
The female gametophyte in flowering plants forms in a _____
a. calyx b. carpel c. receptacle d. corolla e. stamen
What is the intention of the Svalbard Global Seed Vault?
a. protect crop supplies in the event of nuclear winter b. create a time-capsule of modern plants for future botanists c. supplement regional seed banks against accidental losses d. quarantine dangerous genetically-engineered crops
Before a stoma opens:a
the level of carbon dioxide inside the leaf increases. b. potassium ions are actively transported out of guard cells. c. potassium ions are actively transported into guard cells. d. the turgor pressure inside the guard cells decreases. e. water moves by osmosis out of the guard cells.