What are the characteristics of hemoglobin? Check all that apply.
_____ It is a large protein.
_____ It has four subunits.
_____ It binds four O2 molecules cooperatively.
_____ O2 is bound to the heme group that contains an iron atom.
_____ It has an O2 binding group that includes a copper atom.
__X__ It is a large protein.
__X__ It has four subunits.
__X__ It binds four O2 molecules cooperatively.
__X__ O2 is bound to the heme group that contains an iron atom.
_____ It has an O2 binding group that includes a copper atom.
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Answer the following statements true (T) or false (F)
1. Most plants transport sucrose over long distances through the xylem. 2. Vessels of the xylem are dead cells and therefore can transport water and minerals upward in the plant. 3. The Casparian strip prevents apoplastic movement through epidermal cells. 4. Plants that grow in salt marshes must have a mechanism for coping with potential osmotic stress in their cells. 5. When plants take up water and minerals these must pass through both a cell wall and a membrane.
In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of chromatids present
per cell in prophase II after the first division and cytokinesis?
a. 0 b. 6 c. 12 d. 24 e. 48
In tetrad analysis, NPD asci can result from (Select all that apply.)
A) independent assortment of unlinked genes. B) double crossovers between linked genes. C) single crossovers between linked genes. D) single crossovers between a gene and a centromere.
A prokaryote that occupies a habitat consisting of a low pH is a(an):
a. Thermophile b. Halophile c. Basophile d. Acidophile e. Hydrophile