The most compelling evidence that the choanoflagellates give rise to animals is
A. similarity in DNA sequences
B. that they are segmented
C. that they are multicellular
D. that they are not ancestral, i.e. animals are a polyphyletic group
Ans: A. similarity in DNA sequences
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Consider an infertile couple, of which both partners are able to produce healthy gametes, but the woman's history of endometriosis has rendered her unable to carry a fetus. Suppose this couple undergoes IVF with their own gametes, followed by embryo transfer to the uterus of a gestational surrogate, and the birth of a baby. What is the genetic relationship between the surrogate and the baby?
a. The baby shares only X chromosomal DNA with the gestational surrogate. b. The baby shares 25% of its genes with the gestational surrogate. c. The baby shares half of its genes with the gestational surrogate. d. The baby is genetically identical to the gestational surrogate. e. There is no genetic relationship between the gestational surrogate and the baby.
During muscle contractions
a. the myofibrils lengthen. b. the actin and myosin filaments slide over each other. c. the actin filaments move away from the middle of the sarcomere during contraction and toward on relaxation. d. the muscle thins. e. ATP is produced.
Which one of the following pairs is incorrectly matched with antibiotic and its target?
A) penicillin; gram positive bacteria B) nystatin; fungi C) tetracycline; viruses D) griseofulvin; fungi
Chitin, a modified form of cellulose, is not only cross-linked with proteins but its glucose units are modified with atoms of
A. nitrogen. B. hydrogen. C. phosphorous. D. sulfur. E. oxygen.