The endosperm of a plant
a. is the food supply for the new sporophyte plant.
b. is composed of haploid tissue.
c. protects the young embryo within a seed.
d. provides a connection between the ovary of a
flower and a developing seed.
e. produces sperm cells.
Answer: a
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A. vertebrates. B. molluscs. C. cnidarians. D. arthropods. E. vertebrates and arthropods.
Transcription and replication are alike in that both
A) are guided by complementary base pairing. B) are regulated by homeobox genes. C) require DNA polymerase. D) require a promoter and RNA polymerase.
Besides sickle cell anemia, which one is associated with abnormal hemoglobin production?
a. aplastic b. pernicious anemia c. hemolytic anemia d. thalassemia e. iron-deficiency anemia
The replication of a DNA molecule results in:
A) four unwound DNA strands. B) two DNA molecules, one being made of the old strands and one being made of two new strands. C) two DNA molecules, each with one old and one new strand. D) two DNA molecules, both of which are made of completely new strands.