The micropyle is ____
a. the mature male gametophyte
b. the inner seed coat
c. a small opening at one end of an ovule
d. a passageway through the style for sperm
e. the eight-cell stage of a plant embryo
ANSWER: c
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Which of the following are examples of biogenic amines?
A. epinephrine and endorphins B. GABA and serotonin C. epinephrine, dopamine, and GABA D. epinephrine, dopamine, and serotonin E. epinephrine, norepinephrine, dopamine, and serotonin
If you want to analyze this data for evidence of linkage between sn and car, what is the null hypothesis?
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) Genes sn and car are linked.
B) Genes sn and car are not linked.
C) Genes sn and car are located close together on the same chromosome.
D) Crossing-over sometimes occurs between sn and car.
Approximately ____ of Earth’s total primary production is supplied by the ocean’s primary producers
a. one fourth b. one third c. half d. three fourths e. all
Parathyroid hormone causes the blood calcium level to rise, but calcitonin causes those levels to fall. The relationship between the two hormones is described as ________
A) expressive B) antagonistic C) synergistic D) permissive