Which of the following components is not associated with the primary cell wall?

A) cellulose microfibrils
B) hemicelluloses
C) pectins
D) glycoproteins
E) lignins


E) lignins

Biology & Microbiology

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Which represents the highest degree of

certainty? a. hypothesis b. deduction c. assumption d. theory e. prediction

Biology & Microbiology

The external covering of the body is produced by

a. the ectoderm only. b. the endoderm only. c. the mesoderm only. d. the ectoderm and endoderm. e. all of the germ layers.

Biology & Microbiology

What is the general order of genes involved in determining early Drosophila development?

What will be an ideal response?

Biology & Microbiology

P680+ is said to be the strongest biological oxidizing agent. Given its function, why is this necessary?

A) It is the receptor for the most excited electron in either photosystem of photosynthesis. B) It is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system. C) It transfers its electrons to reduce NADP+ to NADPH. D) It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has.

Biology & Microbiology