Eukaryotic cells may contain all of the following except:
A) photosynthetic pigments.
B) flagella.
C) a peptidoglycan cell wall.
D) ribosomes.
E) a membrane-bound nucleus.
C) a peptidoglycan cell wall.
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Diatoms
A. can reproduce asexually. B. are photosynthetic with frustules composed of two halves. C. are motile by virtue of having flagella. D. are photosynthetic with frustules composed of two halves and can reproduce asexually.
When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____
a. does not develop b. forms, but the sperm cannot penetrate the egg c. forms and grows to the ovary, but then stops d. forms, but the sperm are killed e. forms and the egg is usually fertilized, but the embryo rarely grows
Which of the following is a habitat?
a. predator b. intestinal tract c. parasite d. producer e. decomposer
In section 9 (ion channel section) of the second website the S. lividans channel protein is shown. This protein represents a protein in the ____ structural level.
a. Primary b. Secondary c. Tertiary d. Quarternary