Which of the following is a protein essential for regulating gene expression?

A. transcription factors

B. operator genes

C. promoter genes

D. structural genes

The first known bird fossils date to which era of time? A. Triassic B. Cambrian C. Permian D. Jurassic

State two ways light influence terrestrial organisms

Chromosomes are lined up at the equator of the cell during this stage of mitosis. A. Prophase B. Anaphase C. Metaphase D. Telophase

Mineral crystals of quartz, biotite mica, and amphibole are produced primarily by the A) chemical reaction of elements in seawater B) cooling and specification of magma C) deposition of sediments by a glacier D) metamorphism of bituminous coal

Which sequence best describes the passage of sperm? 1. Seminiferous tubules. 2. Vas deference. 3. Epididymis 4. Ejaculatory duct 5. Urethra. A. 3,1,2,4,5 B. 1,3,2,4,5 C. 5,4.2,3,1 D. 1,3,4,2,5 E. 3,1,4,2,5

Based on the data you collected, who likely left the the classroom mess? Justify your answer.

A drug that constricts blood vessels would have which of the following effects?

What hypothesis did Griffith form from the results of his experiments?

Which of the following is true of microbes? A. Ninety-nine percent of all microbes are pathogenic. B. Gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and

What is one differnce between primary and secondary succession