What are the three tissues of a vertebrate gastrula?
What will be an ideal response?
ectoderm, mesoderm and endoderm
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The nitrogenous base that is only found in DNA and not in RNA is:
A. cytosine. B. uracil. C. adenine. D. thymine. E. guanine.
The distance between the crests of two
successive waves of light is called
a. wave frequency. b. wave period. c. wave distance. d. wavelength. e. wave space
When you break your leg, a thickened area forms around the outside of the bone. Over a period of time, this thickened area
A) moves to the skin surface and is shed as dead skin. B) becomes a permanent part of the spongy bone. C) is dissolved by osteoclasts as osteoblasts add new bone. D) is digested by enzymes secreted by the muscles. E) forms new tendons, ligaments, and/or muscles.
A cloned animal is best described as having