Where does germination of a pollen grain occur in a flowering plant?
(a) in the anther.
(b) in the micropyle.
(c) on the surface of the corolla.
(d) on the stigma.
(d) on the stigma.
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What feature of cardiac muscle helps the cells coordinate their contraction as a single unit?
A. Fused cells with multiple nuclei B. Intercalated disks rich in gap junctions C. Covalent bonds between actin and myosin molecules D. Large numbers of motor neurons
Fruits that develop from a flower with many separate ovaries are referred to as:
a. accessory fruits. b. aggregate fruits. c. dry fruits. d. multiple fruits. e. simple fruits.
A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be
A. 5' TTG-CTA-CAG-TAG 3'. B. 3' AAA-AAT-ATA-ACA 5'. C. 3' AAA-GAA-TAA-CAA 5'. D. 5' AUG-CTG-CAG-TAT 3'. E 3' AAC-GAC-GUC-AUA 5'.
Cell-mediated immunity is a function of
A. NK cells. B. T lymphocytes. C. B lymphocytes. D. dendritic cells. E. macrophages.