Melanin pigment affecting skin color is made by
1.erythrocytes.
2.phagocytes.
3.melanocytes.
4.dendritic cells.
5.fibroblasts.
3
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Hybridization and polyploidy led to the evolution of
a. mallard ducks. b. common bread wheat. c. apple maggots. d. bent grass. e. the great apes.
Identify the correct comparison between the human X and Y chromosomes.
A. Only the X chromosome is paired with a homologous match in human females. B. The X chromosome is larger than the Y chromosome. C. Only the Y chromosome is always found without a homologous match. D. Although both are sex chromosomes, they do not share the same genes. E. All of the answer choices are correct.
The three-base sequence of DNA codes for
a. one protein. b. one strand of mRNA. c. one amino acid. d. one polypeptide. e. one strand of tRNA.
True/False: Cytotoxic T-cells directly kill the viruses found inside of infected cells.
What will be an ideal response?