In some genetically engineered corn plants, a Bt gene was added to a chromosome. The Bt gene specifies a protein called Bt that is lethal to certain flying insect pests that eat the corn plants. If the corn plant is is heterozygous for the Bt gene (one homolog has the introduced Bt gene and the other does not), what proportion of the sperm would carry the Bt gene? Is the presence of the Bt gene (a mutation) dominant or recessive to its absence (the wild type)?
A) all pollen; dominant
B) 1/2; dominant
C) 1/3; recessive
D) 1/4; dominant
E) 1/8; recessive
B) 1/2; dominant
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1.Phylum Cnidaria 2.Phylum Nematoda 3.Phylum Porifera 4.Phylum Platyhelminthes
Which one of the following statements is TRUE regarding the structure of a muscle?
A) The outer surface of a muscle is enclosed by many layers of epidermis. B) All muscle cells in a muscle have the same origin and insertion. C) Fascicles of a muscle are surrounded by a thin sheath of hyaline cartilage. D) Connective tissues associated with the muscle converge to form a ligament at each end of the muscle. E) Each fascicle consists of two muscle cells.
If you wished to obtain the strongest phototropic response from a shoot, which wavelength of light
would you use? a. less than 500 nm b. 660 nm c. 730 nm d. 800 nm e. more than 800 nm
In muscle fibers, ___________ motors move along actin filaments.
a) kinesin b) dyein c) combustion d) myosin