Red algae:
a. can live at greater depths than green algae
b. are thought to have developed from green algae
c. contain xanthophylls as their main accessory pigments
d. contain no chlorophyll a
e. are mostly freshwater algae
a
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Which of the following did Mendel confirm with reciprocal crosses that generated an identical F 1 and F 2 offspring ratio of 3:1?
a. Traits are inherited independently. b. Dominant and recessive traits are blended. c. Recessive traits disappear at every cross. d. First-generation crosses produce hybrids.
What is one advantage of using transgenic plant cells to produce human proteins for hormone replacement therapy?
a. Transgenic plants produce lower protein yields than transgenic animals. b. Transgenic plants produce higher protein yields than transgenic animals. c. Plant cells are less expensive to grow than other cell types. d. Transgenic animals cannot produce human proteins. e. HIV is spread through proteins harvested from transgenic animals.
Climbing plants, such as vines, rely on touch to navigate and develop tendrils that coil around objects they encounter. Roots also rely on touch to navigate their way through the soil. When roots come into contact with an object, they generally grow in a direction away from the object. Based on this information, which of the following statements is true?
A. The tendrils are displaying a negative thigmotropic response while the roots are displaying a positive thigmotropic response. B. The tendrils are displaying a thigmotropic response while the roots are displaying a thigmonastic response. C. The tendrils are displaying a positive thigmotropic response while the roots are displaying a negative thigmotropic response. D. Both tendrils and roots are displaying thigmonastic responses to an object in the environment. E. The tendrils are displaying a thigmonastic response while the roots are displaying a thigmotropic response.
The eukaryote cell membrane is composed of
A. Sterols B. Proteins C. Phospholipids D. All of these E. Only sterols and phospholipids