You are working as a botanist in a tropical forest, and have located a small plant that has never been seen or classified before. You learn from your dissection of this plant that it has vascular tissue. Yet, over the lifespan of the plant as it grows and matures in your greenhouse, you observe that it never produces seeds. It does produce small cluster of spore-forming capsules on the underside
of structures that resemble leaves. You classify the plant as a:
a. liverwort
b. fern
c. horsetail
d. bryophyte
e. club moss
b
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The probability of a couple having either a boy or a girl is ½. However, many families have more boys than girls and VICE VERSA. Why is the observed ratio of boys to girls in typical families different than the predicted ratio?
A. There is a large random sampling error due to the small size of families. B. There is a small random sampling error due to the small size of families. C. Humans are more heterozygous than is predicted by random sampling. D. The sex of each child is determined independently. E. Two of the answers are correct. There is a large random sampling error due to the small size of human families and the sex of each child is determined independently.
Sodium-potassium pumps maintain an electrochemical gradient
__________________ Indicate whether the statement is true or false.
What is the first step in CAM photosynthesis?
A) Plants open their stomata at night to take in carbon dioxide. B) Plants open their stomata at any time to take in carbon dioxide. C) Plants close their stomata to raise internal temperatures. D) Plants open their stomata to raise internal temperatures. E) Plants temporarily bind carbon dioxide to a holding molecule.
Large or polar hormones cannot enter a cell directly. What molecule can act as a second messenger for such hormones?
A. Cyclic AMP B. Epinephrine C. Calcitonin D. Catecholamine E. Norepinephrine