Bacterial cells that are variable in shape are called ________.
A. hyphal
B. coccobacilli
C. pleomorphic
D. vibrio
Answer: C
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Beta-blockers are a class of drugs that target beta-adrenergic receptors, blocking the action of epinephrine and norepinephrine. These drugs are used to treat heart conditions, hypertension, glaucoma, and migraine headaches and are also used off-label to alleviate stage fright in performers. Since the beta-adrenergic receptor is a GPCR, what intracellular event is prevented by the use of a beta-blocker?
A. a protein kinase cascade, initiated by the receptor's intracellular kinase domain B. release of an activated G protein subunit bound to GTP C. transport of the receptor-hormone complex into the cell and the nucleus, where it would regulate transcription D. a protein phosphatase cascade, initiated by the receptor's intracellular phosphatase domain 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 G protein-coupled receptors? 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?
Which phylum contains members that do NOT exhibit true segmentation?
a. Chordata b. Nemertea c. Arthropoda d. Annelida
The basic structure of a virus contains:
a. a nucleic acid b. a cell wall c. a protein coat d. both choice 1 and 2 e. both choice 1 and 3
Experiments testing the "good genes" model of sexual selection are notoriously difficult
One problem is to separate environmental factors associated with a particular father (e.g., brood care by father) from the effect of a father's genetics. Which of the following experimental designs solves this problem? a. randomize offspring environment by transplanting offspring to nests of different fathers b. obtain very large sample sizes to factor out fathers' environmental influ-ence c. use genetically identical fathers d. This problem cannot be solved. We have to work only with species in which the father contributes nothing but its genetics. e. A, B, and C.