How does the embryo of an oviparous animal obtain nutrients to grow?
A. from the mother's body
B. from the yolk
C. through tiny pores in the shell of the egg
D. from the nucleus within the yolk
E. from the egg cytoplasm
B. from the yolk
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Refer to the figure above. Which curve best describes survivorship in humans who live in developed nations?
A) A B) B C) C D) D E) E
Communication within and between cells of an embryo can include all of the following EXCEPT _____
A) increased concentration of signaling molecules B) changes in binding to regulatory sequences C) changes in gene transcription D) changes in gene sequences
Which of the following molecules would most likely require a transport protein to cross the plasma membrane of a red blood cell?
A. CO2 B. H2O C. O2 D. C6H12O6
Which is incorrect about parvoviruses?
A) They cause a disease known as fifth disease B) They cause several diseases in dogs, cats and other mammals C) They are single-stranded DNA viruses D) Parvovirus B19 causes erythema infectiosum E) They cannot be transmissible to the fetus