African lungfish, which are often found in small, stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation?
A) Urea takes less energy to synthesize than ammonia.
B) Small, stagnant pools do not provide enough water to dilute the toxic ammonia.
C) The highly toxic urea makes the pool uninhabitable to potential competitors.
D) Urea makes lungfish tissue hypoosmotic to the pool.
B
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Both the phosphorylation of intermediates and the formation of ATP in glycolysis are examples of
A) substrate-level phosphorylation. B) product-level phosphorylation. C) oxidative phosphorylation. D) anabolic phosphorylation. E) aerobic phosphorylation.
Many animals have a mutually-beneficial, symbiotic relationship with bacteria that reside in their guts. To study the effects of these relationships in more detail, research organisms such as fish and mice have been raised under germ-free conditions. What important process do you predict is compromised in germ-free mice?
A. synthesis of essential amino acids B. vitamin C synthesis C. leptin synthesis D. vitamin D synthesis E. vitamin K synthesis Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about essential nutrients can be made by bacteria in the intestines? 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?
In a dihybrid cross involving two autosomal traits on different chromosomes in which the parentals are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
A) 1 out of 16 B) 3 out of 16 C) 6 out of 16 D) 9 out of 16
Which of the following is the correct structure of a nucleotide?
A) Base-sugar-base B) Phosphate-sugar-phosphate C) Phospholipid-base-sugar D) Phosphate-sugar-base