During meiosis in an organism where 2n = 8, how many chromatids will be present in a cell at the beginning of meiosis II?
a. 2
b. 4
c. 6
d. 8
e. 12
d
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Phycobilins are
(a) photosynthetic pigments. (b) found in the red algae. (c) blue and red pigments. (d) all of the above.
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?
Restriction endonucleases in bacteria may have evolved in order to ________.
A. carry out natural genetic engineering B. use nucleic acids as a food (energy) source C. protect the bacteria from infection by viruses D. All of the choices are correct.
All of the following statements are true regarding fetal ultrasound, EXCEPT
A. 3D ultrasounds provide a computer-constructed model of the entire fetus. B. Fetal ultrasounds are contraindicated in male patients due to possible damage to external genitalia. C. Fetal ultrasounds are helpful in the prenatal diagnosis of birth defects. D. Intestinal coils within the umbilicus are normal between weeks 10 and 15. E. Proportionally, the fetus' head:body ratio will be more adult-like the later the ultrasound is done.