Which functional group forms the highly reactive part of aldehydes and ketones?
a. carbonyl group
b. hydroxyl group
c. phosphate group
d. amino group
e. carboxyl group
A
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The substitution of one base pair for another in double-stranded DNA is called a(n):
A. silent mutation. B. risk factor. C. allele. D. heterozygote advantage. E. point mutation.
What is the map distance between the genes for flower color and fruit shape?
Assume that in watermelon plants the genes for flower color (Y = yellow; y = orange flowers) and fruit shape (R = round; r = oval) are on the same chromosome. You cross two true-breeding plants, one with yellow flowers and round fruit and the other with orange flowers and oval fruit. You take one of the F1 individuals and cross it with a plant that is homozygous recessive for both traits. You get the following in the F2: 300 yellow flowers, round fruit; 300 orange flowers, oval fruit; 100 yellow flowers, oval fruit, 100 orange flowers, round fruit. A. 25.0 B. 4.0 C. 40.0 D. 33.0 E. 100.0
Which color pigment is produced by Pseudomonas aeruginosa?
What will be an ideal response?
The prediction, during the early 1800s, that our human population would eventually reach a point where we cannot sustain ourselves has not occurred. Why?
A) The two world wars and the AIDS crisis caused such massive mortality that the human population has stabilized. B) The prediction was wrong; human populations can grow indefinitely. C) Technological advances unforeseen at that time increased the carrying capacity to a greater extent and faster than predicted. D) Humans continue to find ways to enhance environmental quality, thus enabling more people to be supported. E) Dramatic reductions in fertility rates ended population growth before the crisis point was reached.