Classic albinism is an autosomal recessive mutation. However, two parents with albinism may produce a child with normal pigment. How can this be so?
What will be an ideal response?
There are a number of biochemical steps in melanin biosynthesis from tyrosine. For this reason, albinism can be caused by different enzyme deficiencies at different steps of the pathway. If each of the parents' albinism stems from a different enzyme deficiency, they can therefore have a child with normal pigment.
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What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They are all linked to protein kinase activation. B. They associate with protein bound to guanidine phosphates. C. They open ion channels. D. They bind similar hormones. E. They change their conformation when bound to a hormone.
Answer the following statements true (T) or false (F)
1. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships. 2. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species. 3. Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationship among some extinct and living species of flightless birds. They used tissue samples from museums and from living birds. This is an example of discovery-based science. 4. Horizontal gene transfer is thought to have been an important factor in the early evolution of the three domains.
The Boundary Waters Canoe Area (BWCA) is an example of which biome?
A. boreal forest B. tropical rainforest C. short grass prairie D. tundra E. temperate rainforest
Which of the following is true of diabetes mellitus type 1?
A) Cells become resistant to insulin. B) It can be delayed or prevented. C) Most people with diabetes mellitus have this form. D) Patients always require insulin.