RNA differs from DNA in many ways, including
A. DNA contains deoxyribose and RNA contains ribose.
B. DNA contains thymine and RNA contains uracil instead of thymine.
C. All are correct.
D. DNA is double stranded and RNA is single stranded.
E. RNA can catalyze some chemical reactions and DNA cannot.
Answer: C. All are correct.
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The Ca cycle is tightly coupled to the
A) carbon cycle through calcium carbonate formation in ocean waters. B) phosphorus cycle through calcium phosphate formation in sediments and rocks. C) silica cycle through calcium silicate formation in coastal ocean sediments. D) nitrogen cycle because nitrogenase requires calcium ions.
If the nucleotide sequence in a DNA template strand is GGCTTAACCATT; the complementary mRNA strand will have the sequence ____________________
Fill in the blank(s) with correct word
Why are echinoderms and chordates closely related?
A. Because they share adaptations that other phyla do not have B. Because they are often found together as fossils C. Because they have the same type of body symmetry D. Because they look similar
Trachoma is caused by
a) Chlamydia trachomatis. b) Neisseria gonorrhoeae. c) Aspergillus. d) Haemophilus influenzae.