Molecular homology can be compared by analyzing the
A. sequences of amino acids of various proteins in different species.
B. elemental makeup of different species.
C. positions of genes on the chromosomes of different species.
D. vestigial structures of different species.
E. protein structure during development.
A. sequences of amino acids of various proteins in different species.
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Although the genetic contributions of egg and
sperm nuclei are equal, the egg contributes more than the sperm to cell differentiation because of its
a. larger size. b. cytoplasmic determinants. c. proteins. d. cytoplasmic determinants and proteins only. e. cytoplasmic materials, enzymes, mRNA transcripts, and larger size
Gregor Mendel's work was different from that of other researchers working on inheritance in his day because he alone
A. was a religious man. B. actually counted the numbers and types of offspring. C. worked with pea plants. D. knew how to grow plants.
Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder. Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation, a high incidence of skin cancer and premature aging. Based on these clinical characteristics, what is the most likely cause for this disease?
A. lack of telomerase activity B. defects in DNA replication C. defects in DNA repair D. shortened telomeres
A eukaryotic cell has a nuclear envelope that allows tRNA molecules, but not mRNA molecules, to leave the nucleus. Which of the following processes will not be able to take place in this cell?
A) DNA replication B) tRNAs binding to codons C) RNA being made from DNA D) tRNAs binding to amino acids