In many dicots, the first pair of leaves to emerge from the soil after seed germination is completely unlike all the rest of the leaves that form on that plant. In such plants, these leaves are
A) formed from the endosperm.
B) cotyledons, which have elongated and turned green.
C) made from the epicotyl hook.
D) derived from the root, not the shoot.
E) made from the opening and greening of the coleoptile.
B
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The Central Dogma of biology can be stated as
A. proteins® RNA® DNA. B. RNA® DNA® proteins. C. DNA® proteins® RNA. D. DNA® RNA® proteins.
Which of the following statements about plant macronutrients is/are true? Check all that apply.
_____ They approach or exceed 1% of a healthy plant's dry weight. _____ They reduce the need for CO2 during photosynthesis. _____ A deficiency in any one can have severe effects on a plant's growth. _____ They can have important implications for human nutrition. _____ The ability of the plants to take up minerals is affected by soil pH.
In the summer, temperatures in the native range for black widowbirds are exceedingly hot. To
cool themselves, the birds undergo a type of panting known as gular fluttering. This leads to evaporative water loss that cools the birds. This cooling is essential for __________.
a. meiosis b. adaptive radiation c. homeostasis d. heterotrophy
If there are four pairs of chromosomes, how many different combinations of chromosomes are possible?
A. 2 B. 32 C. 8 D. 4 E. 16