What is the basic structure of a dna molecule

An advantage of electron microscopes compared to light microscopes is that electron microscopes

The Blank makes up the cell membrane, which acts as a flexible protective boundary for the cell.

Does a cell energy from when a molecules diffuse in or out of the cell

A natural or human-caused event that changes a biological community and usually removes organisms from it. includes things like fire and storms, which play pivotal roles in structuring many communities.

Which of the following provides evidence for rock formation by cooling? Select the correct answer. 1. crystals in sedimentary rock 2. fossils in igneous rock 3. crystals in igneous rock 4. fossils in sedimentary rock

you are running an experiment trying to figure out how water affects plant growth for three orchid plants you recently bought. The orchids are the same species and you will place the plants next to eachother in the same windowsill.

The living world is organized in levels. Biotic and abiotic factors also can be arranged into levels of biological organization. Put the words below in order from the least complex to the most complex

Which of the following, when taken up by the cell, binds to the repressor so that the repressor nolonger binds to the operator? A) ubiquitin B) inducer C) promoter D) repressor E) corepressor

Which of these organisms would be a producer? A. fish B. grasshopper C. flower D. snake

A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him