Compare and contrast passive and active transport mechanisms, and give an example of each
What will be an ideal response?
Passive transport involves the movement of molecules across a membrane along the concentration gradient without ATP. Examples of passive transport include simple diffusion, facilitated diffusion, and osmosis. Diffusion is the net movement of particles from regions of greater to lower concentration until equilibrium is reached. Facilitated diffusion is the movement of a substance from higher to lower concentration with aid from a membrane protein. Osmosis is the diffusion of water across a membrane from areas of higher to lower concentrations. Active transport requires the input of energy (ATP) for the movement of solutes, typically against the concentration gradient.
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Which of the following statements is incorrect concerning sister chromatids?
A. The formation of sister chromatids doubles the amount of DNA in a cell. B. Sister chromatids consist of two identical copies of a single homologue. C. Sister chromatids are held together at the centromere by kinetochore proteins. D. Sister chromatids are formed during the S phase of the cell cycle. E. Sister chromatids separate during telophase.
Natural selection is best summarized as ____
a. mutation in various species b. independent assortment of genes during meiosis c. the difference in survival and reproduction amound members of a population d. changes in chromosome number or structure e. the adaptation of varying individuals to changes in the environment
The pedigree chart depicts the inheritance pattern of ________. Circles depict females and squares depict males. Colored shapes represent affected individuals (expressing a trait) and uncolored shapes are unaffected (do not express a trait).
A. an autosomal recessive characteristic with both parents being homozygous recessive B. an autosomal recessive characteristic with both parents being heterozygous C. an autosomal dominant characteristic with both parents being homozygous dominant D. None.
Queen Elizabeth II of England is a descendant of Edward VII of England, who was the son of Queen Victoria. Edward VII did not have hemophilia
Prince Philip, who is married to Queen Elizabeth II, is a descendant of Alice, the daughter of Queen Victoria. Alice was a carrier of hemophilia. However, Prince Philip does not have hemophilia. What can you infer about the children of Queen Elizabeth II and Prince Philip? A) None of the children could have the hemophilia allele. B) Only the sons could have the hemophilia allele. C) Only their daughter could have the hemophilia allele. D) Any one of the children could have the hemophilia allele.