An organism is heterozygous for two pairs of genes. The number of combinations of alleles that can form from these two genes in the organism's gametes is _____
Fill in the blank(s) with the appropriate word(s).
Answer: 4
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Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
A) the lung B) the amniotic egg C) bone D) limb specialization E) endothermy
B. thuringiens bacteria is a remarkable resource for researchers and farmers alike when it comes to pest control. Why? Select all correct choices
A. It contains a Ti plasmid. B. It produces insect toxins. C. It is responsible for crown gall disease and can be used to kill parasitic plants. D. Its genes can be used to genetically engineer plants. E. It produces cardenolides.
Myxobacteria lyse bacteria and yeasts by secretion of digestive enzymes. They then use the resulting peptides and amino acids as a source of which of the following?
A. Phosphate B. Iron C. Nitrogen D. All of the choices are correct.
Messenger RNA is:
a. information copied or transcribed from DNA. b. comprised of rRNA. c. comprised of tRNA. d. referenced by DNA. e. used by cells to communicate with each other.