In the annual rings of woody trees, how does the cell size within the xylem of the spring and summer wood compare to the fall and winter wood?
A. It is more dense.
B. It has smaller vessels.
C. The cell walls are thicker.
D. It is younger.
E. The cells are larger.
E. The cells are larger.
Annual growth rings reveal patterns of vascular cambium growth. Vascular cambium is the lateral meristem present in woody eudicots that produces secondary vascular tissues (secondary phloem and secondary xylem). When growth conditions are favorable, the cells produced by the vascular cambium are larger.
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Match the following items with the correct phrases.
_______1. The “building blocks” are held together by glycosidic bonds. _______2. Composed of “building blocks” that contain phosphorous. _______3. Polymers that are composed of amino acids. _______4. Enzymes are examples. _______5. Cellulose, glycogen, and starch are examples. _______6. The “building blocks” are held together by peptide bonds. a. polypeptides b. polysaccharides c. nucleic acids d. substrates
Each NADH that enters the electron transport system results in the production of ________ ATPs.
A. 3 B. 36 C. 38 D. 2 E. 24
What is the name for organisms that make their own food using light as the energy source?
A. Chemoautotroph B. Chemoheterotroph C. Photoautotroph D. Photohetertroph
DNA is tightly wound in a double helix for much of the time. What enzyme unwinds the double helix and be-gins transcription of RNA?
a. RNA polymerase b. DNA polymerase c. Transcriptase d. RNA isomerase e. Complementary isomerase