Closely linked genes nearly always end up ____
a. crossing over
b. assorting independently
c. in the same gamete
d. segregated during meiosis
e. inverted
ANSWER: c
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The ABC genes in Arabidopsis are considered homeotic genes. What could be a reason for this classification?
A) Each of the three genes codes for a different flower organ. B) Each gene codes for regulatory transcription factors. C) Each gene is similar in sequence to homeotic genes in Drosophila. D) Each gene codes for proteins similar to Hox genes in mice.
Answer the following statements true (T) or false (F)
1. DNA polymerase is a protein used in many biotechnology methods that cuts DNA sequences into fragments that can then be pasted into vectors. 2. The method of the polymerase chain reaction (PCR) is used to make enough exact copies of DNA for researchers to use in analysis. 3. Preimplantation genetic diagnosis uses DNA testing to examine the genes in sperm, egg, or embryo cells. 4. The desired outcome of human gene therapy is to find substitute genes from other organisms to cure a disease condition. 5. If farmers use glyphosate-resistant crops, they can spray their fields with a herbicides and it will not harm the plant.
Which of the following describe a role that ethylene plays in plant physiology. (Check all that apply.)A) Retarding stem and root elongationB) Hastening the ripening of fruitC) Inhibition of leaf abscissionD) Inhibition of lateral bud growthE) Accelerates the loss of damaged fruits
What will be an ideal response?
Why is it advantageous for the embryos of reptiles and birds to produce uric acid instead of ammonia?
A. Uric acid will diffuse out of the shell whereas ammonia would be trapped inside of the shell with the developing embryo. B. Uric acid is relatively nontoxic and won't harm the developing embryo as it is stored inside of the egg. Ammonia is far more toxic and could cause developmental problems if it was confined to the interior of an egg alongside of the embryo. C. Uric acid can be recycled by the developing embryo and used as an alternative source of energy. Ammonia cannot be used as an alternative source of energy. D. The uric acid can be broken down much easier than the ammonia by the excretory system of these animals.