What is the approximate molecular weight of the protein that is missing from the homozygous recessive extract?
a. 25 kDa
b. 35 kDa
c. 45 kDa
d. 65 kDa
c
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Polytene chromosomes of Drosophila salivary glands each consist of multiple identical DNA strands that are aligned in parallel arrays. How could these arise?
A) replication followed by mitosis B) replication without separation C) meiosis followed by mitosis D) fertilization by multiple sperm E) special association with histone proteins
A new antibiotic has been developed that inhibits the activity of an enzyme by competitive inhibition. What effect will this have on the activation energy of the enzyme-catalyzed reaction?
A. The activation energy required for the reaction in the presence of the antibiotic would be greater than the activation energy required in the absence of the antibiotic B. The activation energy required for the reaction in the presence of the antibiotic would be less than the activation energy required in the absence of the antibiotic C. The activation energy required for the reaction in the presence of the antibiotic will be the same as the activation energy required in the absence of the antibiotic Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about enzymes and activation energy? What factors influence activation energy? What other information is related to the question? Choose Answer Do you have all necessary information to analyze how the antibiotic might influence activation energy? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The Earth formed approximately
(a) 4600 years ago. (b) 1 million years ago. (c) 1 billion years ago. (d) 4.6 billion years ago.
What can happen when a complement protein encounters an antibody-antigen complex marking a pathogen?
A) The protein can mark the pathogen for destruction by T cells. B) The protein can destroy the pathogen. C) The protein can coat the pathogen to inactivate it. D) The protein can remove the antibody for use elsewhere.