QUESTION 23 A series of experiments shows that oil content in a diploid grain is influenced by five independently assorting genes (a through e) each with two alleles. For each gene one allele confers oil into the grain(+ = additive alleles), the other allele does not The highest producing strain is 20% oil content; the lowest has close to 0%. A plant of unknown genotype has an oil content of 14%. What is a possible genotype for this plant? O a. a*a*b*bccddee O b. a*a*b*b*c*c*d* dee Oc. aab*bc*cat d*e*e* O d. a*a*b*b*c*c*d dete O e. a*a*b*b* ccddee QUESTION 24

QUESTION 23 A series of experiments shows that oil content in a diploid grain is influenced by five independently assorting genes (a through e) each with two alleles. For each gene one allele confers oil into the grain(+ = additive alleles), the other allele does not The highest producing strain is 20% oil content; the lowest has close to 0%. A plant of unknown genotype has an oil content of 14%. What is a possible genotype for this plant? O a. aabbccddee O b. aabbccd dee Oc. aabbccat dee* O d. aabbccd dete O e. aabb ccddee QUESTION 24

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter28: Dna Metabolism: Replication, Recombination, And Repair

Section: Chapter Questions

Problem 19P: Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and...

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Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and donâ€™t divide for prolonged periods, a state termedG0; some, for example neurons, never divide again. a. In what stage of the cell cycle do you suppose a cell might be when it exits the cell cycle and enters G0? b. The cell cycle is controlled by checkpoints, cyclins, and CDKs. Describe how biochemical events involving cyclins and CDKs might control passage of a dividing cell through the cell cycle.
Which of the following statements about cell cycle regulators is incorrect? a. The concentrations of cyclins change throughout the cell cycle. b. Cyclins are present in all stages of the cell cycle except S. c. Cyclin-Cdk complexes phosphorylate target proteins. d. Cdks combine with cyclin to move the cycle into mitosis. e. During anaphase of mitosis, cyclin is degraded, allowing mitosis to end.
Part A and B A. What is the normal function of the Rb protein? A) Rb prevents the cell cycle from proceeding unless the cell is prepared to do so B) Rb causes cells to undergo apoptosis C) Rb promotes Cdk activation D) Each of the other selections is true E) Rb repairs damaged DNA B. How do tumors arise? A) When cell proliferation occurs at a higher rate than cell death B) When someone is infected with a tumor from another person C) When cell death occurs at a very high rate D) When cell proliferation occurs at a very low rate
Part A and B A. What below would be likely to lead to cancer development? A) Overexpression of a cell cycle checkpoint inhibitor B) Loss of expression of a growth factor that promotes cell cycle entry C) Overexpression of a receptor tyrosine kinase that promotes cell cycle entry D) Overexpression of a DNA damage repair enzyme E) Loss of expression of a regulatory transcription factor that activates transcription of a cyclin B. Taxols inhibit the proper function of microtubules and are frequently used as chemotherapy drugs. What is the function of microtubules during the cell cycle? A) They promote the G1 to S checkpoint B) They normally inhibit M phase from being completed C) They form the mitotic spindle E) They mediate DNA replication F) They form the cleavage furrow during cytokinesis
BPA is a chemical compound that has historically been used in the manufacture of plastic products. However, cells often mistake BPA molecules for hormones that accelerate the cell cycle. Because of this, BPA is associated with an increased risk of certain cancers.a. How might BPA interact with the cell cycle and its checkpoints?b. Why do you think that very small concentrations of BPA might have a large effect on a cell?
In a wild-type cell, the function of a protein encoded by a tumor-suppressor gene is to cause a cell to ______. A.) stop dividing B.)extend its telomeres C.) grow toward a new blood vessel D.) respond to a growth factor
BPA is a chemical compound that has historically been used in themanufacture of plastic products. However, cells often mistake BPAcompounds for hormones that accelerate the cell cycle. Because ofthis, BPA is associated with an increased risk of certain cancers. Question: How might BPA interact with the cell cycle and its checkpoints?
How does MPF trigger M phase of the cell cycle? A. MPF phosphorylates proteins that triggers the activation of M phase B. MPF has a regulatory role in breakdown of the nuclear envelope during M phase C. MPF is a dimer subunit that is turned on during S phase to aid with chromosome replication D. MPF Cdk subunits regulate M phase
What is a main difference between onion root tip (plant cell) mitosis and whitefish blastula (animal cell) mitosis? A. The DNA is animal cells is inside of a nucleus but there is no nucleus in plant cells. B. A cleavage furrow is not formed in plant cells due to the rigid cell wall. C. Plant cells do not have DNA and animal cells do. D. Plant cells have undergo prophase where they condense their chromosomes but animal cells skip this step.
Match the process with the correct phase of the cell cycle (G1, S, G2, M). If the process occurs in M phase indicate subphase (ex. telophase). A) ___________________ The bipolar spindle forms from microtubules. B) ___________________ The nucleus breaks down. C) ___________________ Mitochondria are duplicated. D) ___________________Sister chromatids are formed. E) ___________________Extra cell membrane is synthesized by the smooth ER. F) ___________________DNA is compacted into chromatin.
In a normal cell, signals from the external environment play a role in determining whether the cell will grow or replicate during what phase(s) of the cell cycle? A. The S phase only B. The G1 phase only C. The G2 phase only D. Both the G2 and S phases E. All phases of the cell cycle
1. A defective white blood cell does not complete the process of DNA replication. Which of the following is most likely to occur during the cell cycle for this cell? a. The white blood cell will be stopped at the G1 checkpoint and sent to the G0. b. The G2 checkpoint will stop the cell from continuing in the cell cycle. c. The white blood cell will get stuck at the spindle checkpoint. d.The cell will continue on to cytokinesis. 2. Which of the following statements describes how the RNA sequence specifies the production of an amino acid chain? a. Each set of three bases codes for an RNA molecule that specifies the anticodon. b. Each set of three bases codes for a single amino acid. c. Each base codes for one amino acid. d. Each group of three bases codes for an enzyme that binds amino acids together. 3. What will most likely happen when the -35 element and pribnow box are mutated? a. RNA Polymerase II will not be able to bind to the promoter region. b. Prokaryotic RNA…