Which of the following is most similar to the Watson—Crick helix?
A) B-DNA
B) C-DNA
C) A-DNA
D) mRNA
E) Z-DNA
A) B-DNA
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A zygote initially divides into smaller cells, each called a(n)
A. blastomere. B. gastrula. C. neurula. D. embryonic cell. E. cleavage cell.
The human genome codes for 20,000 to 25,000 proteins, but any given cell might produce only 5,000 different proteins. How is this possible?
A) Not every cell has the machinery for transcription and translation. B) Genes are regulated so that not all genes are transcribed in all cells. C) Every cell contains a different fraction of the genome. D) All possible proteins are made in all cells, but those that are not needed are degraded. E) Some cells use introns to produce proteins, and some cells use exons.
Which statement is false?
a. A molecule is made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Proportions of elements in compounds vary according to their source in nature. e. Elements are found in compounds and molecules
Scientists reported that hurricane intensity has increased over the past 35 years, coinciding with increasing sea temperature. At the equator, the Earth receives the
A. maximum amount of solar radiation per unit area. B. minimum amount of solar radiation per unit area. C. maximum amount of solar radiation only over the ocean. D. maximum amount of solar radiation only over the land mass.