Define segmentation and indicate how the annelids, arthropods, and your body exhibit this phenomenon.
What will be an ideal response?
1. Segmentation is the division of the trunk into a series of similar segments. Annelids are composed a series segments that represent partitioning of the animal externally and internally. Arthropods are segmented, with generally one pair of jointed appendages per body segment. Humans are fundamentally segmented. This is reflected internally by the series of similar ribs, intercostal muscles, vertebrae, and so on. [This is a repeated question. It also appears as 10 in Lab 28.]
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Why is it important to have an antibiotic resistance gene in plasmid cloning vectors?
a. It helps the host bacteria grow faster. b. It allows researchers to distinguish bacteria that contain the plasmid from those that do not. c. It aids scientists in developing new antibiotic treatments. d. It allows researchers to distinguish bacteria that contain the recombinant vector from those that contain just the vector. e. It helps the bacteria replicate the recombinant plasmid more quickly.
Tumor suppressors are ________
a. mutant checkpoint genes b. checkpoint genes for proteins that stimulate mitosis c. mutant oncogenes d. checkpoint genes for proteins that inhibit mitosis
Which of the following statements is FALSE?
a. Heat loss represents a one-way loss of energy from an ecosystem. b. Organisms in the food chain can use all the energy contained in the food that they eat. c. In some ecosystems, the majority of the energy stored in plants does not become available until the plants die. d. Heat and energy are lost by each organism in the ecosystem. e. The two food webs are classified as grazing and detrital.
If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a) 2 spot ? 2 spot yields 2 spot and 4 spot (b) 2 spot ? 4 spot yields only 2 spot (c) 2 spot ? 4 spot yields 2 spot and 4 spot (d) 2 spot ? 2 spot yields only 2 spot (e) 4 spot ? 4 spot yields only 4 spot What will be an ideal response?