In a tube-within-a-tube body plan, what forms the outer tube?
a. The body wall
b. The wall of the gastrovascular cavity
c. The vacuolar membrane
d. The intestinal wall
e. The gizzard wall
a
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When both dominant and recessive alleles are present within a single nucleus, the organism is for the trait
a. diploid b. haploid c. homozygous d. heterozygous
Phage typing is useful in identifying ________.
A. Clostridium B. Salmonella C. Treponema pallidum D. Streptococcus pyogenes E. Mycobacterium leprae
_____ bonds link the sugar and phosphate groups in the backbones of DNA molecules
a. Covalent phosphodiester
b. Hydrogen c. Weak d. Ionic e. Weak covalent
Which statement would support a hypothesis that most (about the first 70 percent) of human evolution took place in Africa?
A) The earliest fossils found outside of Africa are 1,800,000 years old. B) No Neanderthal fossils are found in Africa. C) Homo sapiens fossils are found in Africa and Europe. D) The oldest fossils are found in Africa.