Which of these was not characterized of the first cells on Earth?

A. anerobic

B. prokaryotic

C. single-celled

D. contained organelles

What does DNA stand for and what is it?

A hormone travels through the circulatory system to deliver a signal. Of what is this an example? A. enzyme B. intracellular C. ion channel D. intercellular

A population of mice is evenly divided into two groups, and each group is placed on an isolated island with no existing mouse population.

Dna replication is highly accurate. it results in about one mistake per billion nucleotides. for the human genome, how often would errors occur?

The beaches with the strongest sunlight at christmas can be found in

Read the list of common household substances. Antacid, orange juice, toothpaste, vinegar Which of these substances are likely to have a bitter taste? Antacid, vinegar Antacid, toothpaste Orange juice, vinegar Orange juice, toothpaste

Which of the following do fish NOT use to breathe? A. air bladder B. pharyngeal slits C. pores on their back D. olfactory bulbs

Imagine a protein that has been engineered to contain a nuclear localization signal, a nuclear export signal, a C-terminal peroxisomal targeting sequence, and a canonical endoplasmic reticulum (ER) signal sequence.

Which organelle receives protein from endoplasmic reticulum and sorts and packages it for delivery outside cell?

Eukaryotic cells have many different specialized structures that are involved in making, organizing, and delivering a protein molecule. Describe the four organelles that are involved and the sequence of events of this process.