The codon UGA specifies

A) a stop signal in the universal genetic code and in human mtDNA.
B) the amino acid tryptophan in the universal genetic code and in human mtDNA.
C) formyl-methionine in mtDNA.
D) a stop signal in the universal genetic code and the amino acid tryptophan in human mtDNA.


D) a stop signal in the universal genetic code and the amino acid tryptophan in human mtDNA.

Biology & Microbiology

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Retroviruses ____

a. have DNA genomes b. use an RNA intermediate to replicate their genome c. replicate their RNA genome directly to produce progeny RNA genomes d. do not have an envelope e. require reverse transcriptase to replicate their genome

Biology & Microbiology

The molecule shown above is testosterone, a substance that has important regulatory functions in

humans and many other animals. Molecules with regulatory functions like testosterone are called ____.

a. phytosterols b. enzymes c. lipoproteins d. hormones e. receptors

Biology & Microbiology

Which of the following is the site where

mature sperm are stored? a. ureter b. urethra c. vas deferens d. bulbourethral gland e. epididymis

Biology & Microbiology

Fungi that reproduce by "budding" are:

A) prokaryotic. B) made of hyphae to form a reproductive mycelium. C) yeasts. D) autotrophic.

Biology & Microbiology