If a DNA samples contains 13% adenine, what percentage of the sample contains cytosine?
A. 13%
B. 37%
C. 26%
D. 74%
Ans: B. 37%
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The manufacture of ATP in both photosynthesis and cellular respiration is made possible by
-the existence of a proton gradient across specific membranes. -the action of ATP synthase. -energy from the movement of electrons. -the action of electron-accepting proteins. -all of the above
Incomplete genetic linkage of three genes in a trihybrid produces eight genetically different gamete genotypes. How many different gamete genotypes are produced in a four-gene cross with incomplete genetic linkage?
A) 4 B) 8 C) 16 D) 20 E) 24
Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
A) a mineralized, bony skeleton B) opercula C) a spiral valve intestine D) a swim bladder
Choose the correct statement regarding estrous and menstrual cycles.
A. The lining of the uterus is shed during menstruation and estrous. B. Copulation can only occur during ovulation in the menstrual cycle. C. Ovulation only occurs in animals with a menstrual cycle. D. Menstrual cycles are longer than estrous cycles. E. Animals with estrous cycles are sexually receptive only when they are ovulating.