When

e. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. this cluster of genes is referred to as the?

The spanish encomienda wasa. part of the columbian exchange. b. a system of forced labor. c. a disease that killed american indians. d. an expedition that searched for gold.

Which element is found in nucleic acids but not in proteins? carbon hydrogen nitrogen phosphorus

Which of the following statements regarding the moon and Earth is correct? A. Earth and the moon are nearly the same age. B. Earth is tidally locked, while the moon spins on its axis. C.

What is the most primitive group of fishes and what is the defining characteristics of animals in this group?

In your own words, explain what natural selection is?

Which of these substances could be driven across a membrane by the resting membrane potential?

Norway rats have 42 chromosomes in their diploid cells. If a diploid rat cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II?

Which discovery is attributed to Phoebus Levene? A. extraction and observation of DNA B. identification of ribose and deoxyribose C. recognition of RNA as DNA's messenger D. construction of an accurate DNA model

A small population of chimpanzees lives in a habitat that undergoes no changes for a long period. how will genetic drift probably affect this population?

Which type of cells can differentiate into many different types of cells? select all that apply