The water vascular system of the sea star ________
a. is based on ampullae inside each of the tube feet, which contract to lengthen the foot for locomotion
b. is a simple digestive system that expels coarse, undigested residues through the mouth
c. is an open circulatory system
d. flushes millions of eggs from the gonad
a
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Describe two mechanisms that Archaea use to avoid their DNA melting at temperatures above 100 °C
What will be an ideal response?
Niche refers to the
a. home range of an animal. b. preferred habitat for an organism. c. functional role of a species in a community. d. territory occupied by a species. e. locale in which a species lives
________ molecules deliver amino acids to ribosomes during translation.
A. Ribosomal RNA (rRNA) B. Messenger RNA (mRNA) C. Transfer RNA (tRNA) D. Heterogeneous nuclear RNA (hnRNA)
Which of the following statements is true?
a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits. b. Homologous chromosomes differ in banding patterns, the traits they code for and size. c. While sex chromosomes determine different genders they look the same until they are stained. d. In humans all 46 chromosomes have an identical match called the homologue.