third exam bio 1406 fall 2006 mwf 100 answers

third exam bio 1406 fall 2006 mwf 100 answers -...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Introductory Biology, Biology 1406. TAMU-CC. 3 rd lecture exam 10 November 2006. Learning community sections 1. If an organism has allele 1 and allele 3, which are found on question 21, which allele is likely to be the dominant allele? a. allele 1 b. allele 3 c. neither allele d. both alleles Allele 1 because allele 3 makes a product that is likely to be non-functional 2. If an organism has alleles 1 and 2 from question 21 it is: a. homozygous because the DNA sequence of allele 1 and 2 are the same b. heterozygous because the protein products of allele 1 and 2 are different c. heterozygous because the DNA sequence of allele 1 and 2 are different heterozygous and homozygous have to do with the DNA sequence not the product the allele makes 3. If the dominance relationship between alleles is codominance, would an organism with alleles 1 and 4 from question 21 display a different phenotype than an organism homozygous for allele 1? a. yes b. no c. it might, it depends on the function of the different product produced by allele 4 No. Even if the dominance between the alleles is one of codominance, if each allele makes a functional product, the products are the same! 4. At the start of the experiment, all nitrogen in the DNA of bacteria is heavy nitrogen ( 15 N). When the bacteria divide, the normal isotope of nitrogen ( 14 N) is used to make the new DNA strands. After TWO rounds of replication using the normal isotope of nitrogen the resulting DNA is centrifuged in a cesium gradient. Tube 1 supports the hypothesis of semiconservative DNA replication and tube 4 supports the hypothesis of conservative replication. a. 1; 2 b. 1; 4 c. 3; 4 d. 1; 3 e. correct combination not listed 5. In a roan shorthorn bull, a cell divides. After cell division, the resulting cells only have red or white alleles. How did this cell divide? a. mitosis b. meiosis c. cannot determine Before cell division, cells had pairs of chromosomes. After cell division, cells are haploid. The cell divided by meiosis. 6. A pea plant true breeding for round seeds was crossed with a plant true breeding for wrinkled seeds. All offspring of this cross had round seeds. The dominance relationship between the alleles for seed shape is: a. one of incomplete dominance b. one of codominance c. one of complete dominance d. the allele for round is R and the allele for wrinkled is r If you see one trait or the other, the dominance relationship is complete dominance. 7. A person is diagnosed with diabetes. Diabetes is caused by a lack of insulin production by cells in the pancreases. Diabetes is normally treated with administration of insulin. After the administration of
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
insulin, blood glucose levels return to normal levels because cells are stimulated by insulin to take up glucose from the blood. However, in this person, blood sugar levels remain high after administration of insulin. Why might this be the case? a. the person has too many receptors for insulin
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/27/2008 for the course BIO 1407 taught by Professor Grise during the Spring '08 term at Texas A&M University, Corpus Christi.

Page1 / 10

third exam bio 1406 fall 2006 mwf 100 answers -...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online