The changes that were necessary to cope with the heavy energy demands of flight in birds include all of the following except
A. efficient respiration.
B. efficient circulation.
C. endothermy.
D. auxiliary air sacs and hollow bones.
E. a three-chambered heart.
E. a three-chambered heart.
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Spermatogenesis is governed by _____
a. GnRH b. luteinizing hormone only c. luteinizing hormone and follicle stimulating hormone d. follicle stimulating hormone only e. GnRH, luteinizing hormone, and Sertoli cells
The part of a chlorophyll molecule that absorbs light energy is the porphyrin ring
__________________ Indicate whether the statement is true or false.
Using a light microscope, it is easiest to see chromosomes:
a) during interphase because they are uncoiled and have a more linear structure. b) during sexual reproduction. c) during mitosis and meiosis because the condensed chromosomes are thicker and therefore more prominent. d) during asexual reproduction. e) during interphase when they are concentrated in the nucleus.
In somatic cells, if a base is mismatched in one new daughter strand during DNA replication, and is not repaired, what fraction of the DNA duplexes will have a permanent change in the DNA sequence after the second round of DNA replication?
(a) 1/2 (b) 1/4 (c) 1/8 (d) 1/16