Unlike vessel elements, ____________ have no perforation plates.
Fill in the blank(s) with the appropriate word(s).
tracheids
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What is the distribution of phenotypes from a cross of purple tall pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white; tall is dominant to dwarf.)
A. 63 purple tall; 28 purple tall; 27 white dwarf; 7 white dwarf B. 132 purple tall; 138 white dwarf C. 54 purple tall; 6 white dwarf D. 100% purple tall E. 27 purple dwarf; 28 purple tall; 31 white dwarf; 29 white tall
Scientists estimate that at least 50-60% of all species now living will most likely become extinct in the next 20-50 years unless planned, coordinated action takes place.
Answer the following statement true (T) or false (F)
Which of the following cells has a plasma membrane?
A) an animal cell B) a plant cell C) a fungal cell D) a bacterial cell E. all of the above
Which of the following is acquired when amoebas are forced into human nasal passages during swimming?
A. Entamoeba histolytica B. Toxoplasma gondii C. Naegleria fowleri D. Balantidium coli E. Giardia lamblia