What is most critical for understanding the minimal gene set and the origin of life?
a. the number of genes
b. the functions of the genes
c. the stable environments of bacteria with the most reduced genomes
d. the identity of genes involved in fatty acid/lipid metabolism to understand the origin of cell membranes
B
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Which of the following is (are) NOT trend(s) of
vertebrate evolution? a. conversion of the support for locomotion from the notochord to the vertebral column b. expansion of the nerve cord to form the brain and spinal cord c. changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system d. the development of fewer, more efficient chambers in the heart e. modification of limbs for more efficient movement
Scientists are now grouping reptiles with birds and mammals because they are all vertebrates that have a(n):
a. divided brain. b. amniotic egg. c. mammary gland. d. jointed appendage. e. epidermal covering.
When the DNA in a cell is uncoiled and spread throughout the nucleus, it is called
A) a chromosome. B) a centromere. C) chromatin. D) a chromatid.
The proteins that bind to the DNA near regions where gene transcription begins are called
A) promoter genes. B) homeobox genes. C) mRNA. D) the gray crescent. E) transcription factors.