Bone deposit is done by this type of cell
What will be an ideal response?
Osteoblasts
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Nitrogen-fixing bacteria convert ____ to ____
a. gaseous nitrogen; ammonia b. ammonia; gaseous nitrogen c. gaseous nitrogen; nitrates d. gaseous nitrogen; nitrites e. ammonia; nitrates
Which of the following occurs in the placenta?
A) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood. B) Hormones are absorbed to prevent them from influencing the developing fetus. C) Fetal blood and maternal blood mix. D) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi. E) The amnion and the chorion grow into the endometrium.
In Arabidopsis, FLD (a deacetylase enzyme) stimulates flowering. Which of the following statements is TRUE?
A. FLD deacetylates histones that bind to the FLC gene, causing repression of FLC transcription. B. FLD deacetylates histones that bind to regions of the FLC gene and stimulates its transcription. C. FLD causes repression of FLC translation. D. FLD deacetylates histones surrounding the FLD gene, causing suppression of FLD transcription.
How long does it take for the daughter cells from one round of replication to replicate themselves?
a. 20 minutes b. No time is required -- they are ready to divide immediately after DNA replication and separation of the daughter cells is complete if conditions are right. c. After the cells have matured fully. d. No time is needed -- the daughter cells cannot replicate further.