How many different types of aminoacyl tRNA synthetases are there?
A. 2
B. 4
C. 20
D. 61
E. 64
Answer: C
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Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. Based on this pedigree, what is the most likely mode of inheritance?
A) Dominant
B) Recessive
C) Either dominant or recessive
D) Cannot be determined
The outermost whorl of a flower typically consists of one or more
a. petals. b. carpels. c. stamens. d. receptacles. e. sepals.
In comparison with the epilimnion of a lake, the water of the hypolimnion is
A) warmer. B) less dense. C) cooler. D) more oxygenated.
Hensen's node is located:a
in the walls of the archenteron. b. at the end of the primitive streak. c. on the outer side of the chorion. d. inside a blastomere. e. inside the neural groov