A challenge to traditional (pre-1860) ideas about species came from embryology, where it was discovered that _________.

A. all animals develop similar embryonic gills
B. embryos of dissimilar organisms, such as sharks and humans, resemble each other
C. the more advanced the animal, the more slowly it develops
D. mutations have a far more dramatic effect on embryos than on adult organisms


B. embryos of dissimilar organisms, such as sharks and humans, resemble each other

Biology & Microbiology

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Which of the following would be classified as a tropic hormone? Select all correct choices

A. thyroid-stimulating hormone (TSH) B. oxytocin C. adrenocorticotropic hormone (ACTH) D. estrogen E. somatostatin

Biology & Microbiology

How many different types of gametes can be produced by an individual with genotype AaBBCcDdEe, if all five genes are on different chromosomes?

A) 4 B) 5 C) 10 D) 16 E) 25

Biology & Microbiology

Genetic recombination involves the use of ____ enzymes to cut out segments of DNA. 

A. restriction endonuclease B. snurp C. ligase D. DNA polymerase

Biology & Microbiology

Which tissues are correctly matched to their progenitor germ layer? (Check all that apply.)A) Ectoderm-lining of the digestive tractB) Ectoderm-epidermisC) Endoderm-lining of the respiratory tractD) Endoderm-musclesE) Mesoderm-blood vesselsF) Mesoderm-gonads

What will be an ideal response?

Biology & Microbiology