Which of these are produced directly by meiosis in pine?
a. sperm cells.
b. pollen grains.
c. microspores.
d. microspore mother cells.
c
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Which pair correctly associates a physiological process with the appropriate vitamin?
A) blood clotting â€" vitamin C B) normal vision â€" vitamin A C) synthesis of cell membranes â€" vitamin D D) production of white blood cells â€" vitamin K
Which of the following is NOT a characteristic of
birds? a. feathers modified from scales b. a four-chambered heart c. excellent vision d. migratory behavior e. teeth
Eukaryotic mRNAs are modified by the addition of a poly(A) sequence at the 3' end and 7-methyl guanosine at the 5' end.
Answer the following statement true (T) or false (F)
Who proposed the concept of chemotherapy, that compounds might selectively kill pathogens without harming people?
A) Gerhard Domagk B) Alexander Fleming C) Paul Ehrlich D) Selman Waksman E) Joseph Lister