Which trait is not found in all chordates?
a. a dorsal nerve cord
b. a postanal tail
c. an internal backbone
d. a notochord
c
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The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
Semen contains
a. sperm. b. the secretions of sex accessory glands. c. eggs. d. both a and b.
The organelle that converts harmful hydrogen peroxide to water and oxygen is the ____
a. smooth ER b. peroxisome c. Golgi body d. ribosome e. lysosome
Transcription is a synonym for:
a. translation. b. DNA repair. c. protein synthesis. d. DNA synthesis. e. RNA synthesis.