In reproductive cloning, a sperm is not used, but an egg is still required. Why?
A) Udder cells will fuse only with egg cells.
B) Surrogate mother animals will develop only embryos derived from their own eggs.
C) Egg chromosomes are required for embryonic development.
D) Egg proteins are required for embryonic development.
Answer: D
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Female peahens choose a male peacock for mating because of the male's long, colorful tail feathers and their courtship display. This is which type of sexual selection?
A. Intrasexual selection. B. Robustness selection. C. Intersexual selection. D. Cryptic selection. E. Balancing selection.
Answer the following statements true (T) or false (F)
1. The covalent bonds that hold monosaccharides together in a polysaccharide are called glycosidic bonds. 2. A DNA nucleotide consists of the following three parts: a nitrogenous base, ribose, and a phosphate group. 3. The waxes in the cell walls of Mycobacterium tuberculosis cause this organism to be acid-fast. 4. The basic structure of a cell membrane is a lipid bilayer. 5. DNA polymerase is the only enzyme required for DNA replication.
Tularemia, characterized by glandular, ulceroglandular, oculoglandular, oropharyngeal, systemic, and pneumonic presentations, is caused by which of the following species?
a. Brucella b. Bordetella c. Pasteurella d. Francisella
How may an enhancer sequence facilitate transcription?
What will be an ideal response?