Which molecule carries an anticodon?

A. DNA
B. mRNA
C. rRNA
D. tRNA


D

Biology & Microbiology

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Which of these are spore-producing structures?

A) sporophyte (capsule) of a moss B) antheridium of a moss or fern C) archegonium of a moss or fern D) gametophyte of a moss

Biology & Microbiology

Which of the following amino acids has a nonpolar thioether R group?

A. cysteine B. serine C. tryptophan D. methionine E. None of the choices given is correct.

Biology & Microbiology

Which of the following is a congenital immunodeficiency condition resulting from a small or absent thymus that affects young children?

Biology & Microbiology

The mechanism for excreting nitrogenous waste in aquatic animals was ineffective on land because

A) land animals concurrently developed a more efficient reproduction system. B) land animals found better food sources. C) land animals had a more difficult time with water balance than aquatic species. D) aquatic animals did not have as much protein in their diets as did land animals.

Biology & Microbiology