In plants, chloroplasts are necessary for _______.
a) respiration
b) storage
c) photosynthesis
d) cell movement
Ans: c) photosynthesis
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What percentage of the earth's atmosphere consists of nitrogen (N2) gas?
A. 0% B. 10% C. 28% D. 44% E. 78%
The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.
Which can result in Down syndrome? (Select all that apply.)
A) nondisjunction resulting in an extra chromosome 21 B) a reciprocal translocation between acrocentric chromosomes 14 and 21 C) deletions of a segment of chromosome 21 D) having the triploid number of chromosomes
Which of the following statements concerning radiolarians is FALSE?
a. They lack shells. b. They are actinopods. c. They are rhizarians. d. They have axopods. e. They are important constituents of plankton.