Each codon on a DNA strand codes for:

A) a single amino acid.
B) a protein.
C) multiple amino acids.
D) a single gene.
E) multiple genes.


A) a single amino acid.

Biology & Microbiology

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Cactus leaves are modified as trichomes

a. True b. False

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A mammalian female's

a. cells usually have multiple Barr bodies. b. body is a mosaic for the X-linked traits she inherits. c. Barr bodies are active in some cells. d. Barr bodies are produced after puberty. e. X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell

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Activated G protein-coupled receptors can ____________.

a. bind GTP b. open an ion channel c. raise cytosolic calcium d. a and b are correct e. a, b and c are correct

Biology & Microbiology

Suppose a microbiologist wanted to identify the microbe responsible for a specific metabolic activity. To simultaneously assess metabolic activity and phylogenetic identity, the best technique would be ________.

A. metatranscriptomics B. optical tweezers with microelectodes C. isotope fractionation D. microautoradiography with fluorescent in situ hybridization (MAR-FISH)

Biology & Microbiology