During the synthesis of which type of molecule is a carboxyl group lost from a fatty acid, and water produced as an end product?
A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
Ans: A) lipids
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You are an attending physician supervising a new resident. Together, you decide to treat a patient with a steroid drug. The resident administers the drug and watches the patient anxiously. "It's not working," he mutters. How do you respond?
A. "You're right, it doesn't seem to be working. Let's increase the dose, since we need to achieve high steroid levels in the blood." B. "Why don't you go on your rounds and come back? Steroid hormones need several hours to work, since they regulate gene expression. Transcription and translation take time." C. "We forgot to administer the carrier protein to get the drug across the cell membrane. We can add that now." D. "Let's grab a cup of coffee and then check again. Activating the G-protein coupled receptor and its downstream kinase cascade can take several minutes." 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 hormones? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? 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?
Of the comparisons listed below, which is not true in distinguishing DNA from RNA?
A. DNA is a long double-strand molecule while RNA is a shorter single-strand molecule. B. All of the answer choices are correct. C. DNA and RNA are different in that RNA has uracil instead of thymine. D. DNA has a main function of storing genetic information, while RNA is used to build specific proteins in a cell. E. DNA is a molecule that stores and regulates our genetics, while RNA is used for cellular energy storage and release for biological functions.
Most of the active functions of plasma
membranes are carried out by
a. cholesterol. b. proteins. c. hydrophilic heads. d. hydrophobic tails. e. carbohydrates
If one pair of genes could cause some flowers to have red petals or yellow petals and could also determine the strength of the stem, this would be an example of
A. polygenic inheritance. B. pleiotropy. C. recessiveness. D. hybrid.