Bacteria, insects, and plants use carbohydrates to build structures. Which of the following is true of structural carbohydrates?
A) Different types of pentose monomers form the basis of all carbohydrate-based structures.
B) Structural carbohydrates show a high degree of branching.
C) All structural carbohydrates are made from the same monomer, ?-glucose.
D) Structural carbohydrates are long strands, which are chemically linked into a network.
Answer: D
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A) lignin B) sucrose C) starch D) chlorophyll
If every sexually reproducing organism has only two alleles for each gene, how can there be a range of traits seen for a physical characteristic?
A) There can be more than two variations of a gene in a population. B) One of the alleles in an organism is expressed at different levels, while the other is turned off. C) Sometimes one of the alleles works, and other times the other allele works. D) In a population there are only two variations of a gene, but they are blended differently during sexual reproduction.
If you were measuring hormones in the blood of a patient who was ovulating, you would expect a large increase in which hormone, reaching maximal level on the day of ovulation?
A. follicle-stimulating hormone (FSH) B. luteinizing hormone (LH) C. estrogen D. progesterone E. gonadotropin-releasing hormone (GnRH)
Caddisflies are insects that lay their eggs on the bottom of streams. The eggs mature into larvae, and eventually the larvae pupate, move to the surface of the stream, shed their pupal membranes, and emerge as winged adults. Caddisflies demonstrate
A) incomplete metamorphosis. B) complete metamorphosis. C) alteration of generations.