In humans, normal skin pigmentation is influenced by a dominant gene (C), which allows pigmentation to develop
All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin
formation and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that
the next child will be an albino? What will be an ideal response?
ANSWER: In this situation both parents are normal so they are either CC or Cc. If both parents were CC
or one was CC and one Cc then they could not produce an albino child. This means both
parents must be Cc. With two heterozygous parents, the chance a child will be homozygous
recessive cc is 1/4. So these parents have a 25 percent chance their next child will be albino.
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Most phosphorous, such as that found in inorganic phosphate (HPO4-), exist in the +5 oxidation state in nature
Indicate whether the statement is true or false.
Which of the following statements is true?
a. Bacterial chromosomes are broken into individual segments containing one or more genes, which are then replicated. b. The cell’s circular chromosome is unzipped and the strands separated before the replication process can begin. c. The cell’s circular chromosome begins unzipping and replicating in one direction from the origin to the terminal. d. Replication proceeds in both directions from the origin until both strands are complete chromosome loops.
Which statement is false about complex IV?
A) A binuclear center that contains an iron ion and heme-a3 is the site of the reduction of molecular oxygen to water. B) Bacterial and eukaryotic forms of complex IV have very similar structures and number of subunits per functional unit. C) The core structure of the cytochrome c oxidase in complex IV has three conserved subunits. D) Copper ions shift from a +2 oxidation state to a +1 oxidation state as electrons are passed through the complex.
When faced with a threat, gopher snakes and bull snakes, who have markings similar to rattlesnakes, will "rattle" their tails in brush to sound like a rattlesnake. In this case, the gopher and bull snakes are mimics, and the rattlesnake is the:
A) predator. B) model. C) commensal. D) prey.