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

Biology & Microbiology

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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

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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

Biology & Microbiology

A gram negative cell that has lost its cell wall is a

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology