Identify four external features of a woody twig and briefly explain the function and/or origin of each. What will be an ideal response?
terminal bud at the tip and lateral buds in leaf axils: embryonic shoots
bud scale scars: indicate where bud scales were located previously
leaf scars: indicate where each leaf was previously attached to the stem
bundle scars: indicate where vascular tissues are located within the leaf scar
lenticels: regions of gas exchange on the stem
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Which of the following organisms is (are)
easily modified by genetic engineering?
a. bacteria and yeasts b. bacteria and mice c. yeasts and mice d. molds and mice e. humans
Stretch-sensitive muscle spindles are indicated by the letter _____
a. A b. B c. C d. D e. C and D
Organisms capable of nitrogen fixation
a. include some bacteria. b. include some cyanobacteria. c. may live as symbionts with other organisms. d. all of the above.
In horses, there are four alleles at the A locus. Arranged in dominance sequence, they are:A
(wild) ab (bay) ac (brown) ad (black) If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what type of offspring would be produced and in what proportion? What will be an ideal response?