Which type of cell contains a nuclear membrane?
a. Eukarya
b. Prokarya
c. Bacteria
d. Archaea
Answer: a. Eukarya
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Atrial natriuretic hormone (ANH) stimulates the kidneys to excrete salt and water in the urine. Why does it make sense that the heart is the source of ANH?
A. The heart is a major endocrine organ that releases several hormones. B. ANH helps regulate blood pressure, which is sensed by distension of the heart atria. C. The heart is conveniently close to the hypothalamus. D. Secretion of hormones by the heart makes it easy for them to enter the bloodstream. 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 atrial natriuretic hormone? 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?
Linked DNA segments from humans and vectors, such as plasmids, are called
____________________ molecules. Fill in the blank(s) with the appropriate word(s).
Which statement about tissue transplants is TRUE?
a. The source of graft rejection is T cell recognition of the foreign MHC antigens on the transplanted cells. b. If transplants demonstrate a perfect match for all Rh antigens, then there is a 95% success rate. c. Successful transplants require a complete match of all MHC antigens. d. Xenotransplantation avoids the fundamental transplant mechanism of graft rejection. e. Skin can be successfully transplanted between siblings and other closely related family members.
Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. The relationship between genes S and N is an example of _____.
A) incomplete dominance B) epistasis C) pleiotropy D) codominance