Which of the following is only true of RNA, but not DNA?
A. Guanine pairs with cytosine.
B. Adenine pairs with uracil.
C. The backbone is made up of alternating 5-carbon sugars and phosphate groups.
D. It is comprised of nucleotides.
Answer: B
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The statement "DNA ? RNA ? Proteins" _____
A) is known as central dogma B) depicts the regulation of gene expression C) is the same in all organisms including viruses and prions D) describes a series of catalytic reactions
Carbonaceous chondrites I. contain mostly iron and nickel. II. contain volatiles. III. contain chondrules. IV. are similar in composition to the S-type asteroids
a. II & III b. I, II & III c. II, III & IV d. I, III, & IV e. I, II, III, & IV
Which of the following is a kind of reproduction found only in freshwater sponges?
a. Fragmentation b. Budding c. A single individual producing both sperm and egg d. The formation of gemmules
Lancelets are
a. fish shaped. b. filter feeders. c. three to seven centimeters long. d. burrowers in shallow sediments. e. all of these.