If plants originated from an organism like Chlamydomonas, then the origin of plants involved the loss of ________.
A. cell walls
B. chloroplasts
C. microtubules
D. flagella
Answer: D
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The digestion of which class of foods begins in the mouth?
a. carbohydrates b. proteins c. lipids d. amino acids e. nucleic acids
Which structure in the bird's digestive tract is utilized for food storage?
a. the esophagus b. the crop c. the mouth d. the gizzard
A gram negative cell that has lost its cell wall is a
What will be an ideal response?
When homologous chromosomes crossover, what occurs?
A) Two chromatids get tangled, resulting in one re-sequencing its DNA. B) Two sister chromatids exchange identical pieces of DNA. C) Specific proteins break the two strands and re-join them with their homologs. D) Each of the four DNA strands of a tetrad is broken and the pieces are mixed. E) Maternal alleles are "corrected" to be like paternal alleles and vice versa.